用户登录注册界面开发及用户信息管理案例详解
刚开始接触Android编程，这算是我写的第一个简单工程，主要功能有：用户登录、注册、注销、修改密码、记住密码共5个基本操作，其内容涉及到以下几点：

1：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用；
2：多个Activities之间的切换；
3：使用Android本地数据库来管理用户信息。
实现上述功能的主要参考资料：CSDN博客之星郭霖大牛写的《第一行代码—Android》，个人比较喜欢看纸质的资料，所以买了这本书，大牛的博客主页链接http://my.csdn.net/sinyu890807。其次是参考了网上的一个用户登录注册的程序，在此基础上按照自己的需求慢慢添加完善一些功能，并且将原来的单个avtivity换用多个activity实现，UI设计也更加漂亮美观。
先上几个图【我在android6.0.1的真机上调试的】：
下面是用户登录和用户注册界面。用户登录注册界面开发及用户信息管理案例详解
刚开始接触Android编程，这算是我写的第一个简单工程，主要功能有：用户登录、注册、注销、修改密码、记住密码共5个基本操作，其内容涉及到以下几点：
1：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用；
2：多个Activities之间的切换；
3：使用Android本地数据库来管理用户信息。
实现上述功能的主要参考资料：CSDN博客之星郭霖大牛写的《第一行代码—Android》，个人比较喜欢看纸质的资料，所以买了这本书，大牛的博客主页链接http://my.csdn.net/sinyu890807。其次是参考了网上的一个用户登录注册的程序，在此基础上按照自己的需求慢慢添加完善一些功能，并且将原来的单个avtivity换用多个activity实现，UI设计也更加漂亮美观。
先上几个图【我在android6.0.1的真机上调试的】：
下面是用户登录和用户注册界面。

下面是用户密码修改和个人中心界面。

**

一、工程代码

**
整个工程是在Android Studio 2.1.1环境下实现的，源码下载链接在末尾给出，下面是工程目录：

这里先贴出各个布局文件.xml，各个类内容和各个activity代码：

1：几个界面布局文件.xml

    login.xml【登录界面】

<?xml version=“1.0” encoding=“utf-8”?>  
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”  
    xmlns:tools=”http://schemas.android.com/tools”  
    android:layout_width=”match_parent”  
    android:layout_height=”match_parent”  
    android:paddingBottom=”@dimen/activity_vertical_margin”  
    android:paddingLeft=”@dimen/activity_horizontal_margin”  
    android:paddingRight=”@dimen/activity_horizontal_margin”  
    android:paddingTop=”@dimen/activity_vertical_margin”  
    tools:context=”com.example.foolishfan.user_v10.Login”>  
    <RelativeLayout  
        android:id=”@+id/login_view”  
        android:layout_width=”400dp”  
        android:layout_height=”800dp”  
        android:layout_centerInParent=”true”  
         >  
  
        <Button  
            android:layout_width=”fill_parent”  
            android:layout_height=”wrap_content”  
            android:text=”注册”  
            android:id=”@+id/login_btn_register”  
            android:onClick=”resetpwd”  
            android:textColor=”#ffffff”  
            android:background=”#e52525”  
            android:textSize=”20dp”  
            android:layout_below=”@+id/login_btn_login”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:layout_marginTop=”10dp” />  
  
        <Button  
            android:layout_width=”fill_parent”  
            android:layout_height=”wrap_content”  
            android:text=”登录”  
            android:id=”@+id/login_btn_login”  
            android:onClick=”finish_login”  
            android:background=”#545bcb”  
            android:textSize=”20dp”  
            android:textColor=”#ffffff”  
            android:layout_below=”@+id/login_edit_pwd”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:layout_marginTop=”52dp” />  
  
        <ImageView  
            android:layout_width=”300dp”  
            android:layout_height=”150dp”  
            android:id=”@+id/logo”  
            android:layout_alignParentRight=”true”  
            android:layout_alignParentEnd=”true”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:layout_alignParentTop=”true”  
            android:layout_alignWithParentIfMissing=”false”  
            android:background=”#ffffff” />  
  
        <EditText  
            android:layout_width=”400dp”  
            android:layout_height=”60dp”  
            android:inputType=”textPassword”  
            android:ems=”10”  
            android:id=”@+id/login_edit_pwd”  
            android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
            android:hint=”请输入您的密码”  
            android:layout_below=”@+id/login_edit_account”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true” />  
  
        <EditText  
            android:layout_width=”400dp”  
            android:layout_height=”60dp”  
            android:inputType=”textPersonName”  
            android:id=”@+id/login_edit_account”  
            android:drawableLeft=”@android:drawable/ic_menu_myplaces”  
            android:hint=”请输入您的用户名”  
            android:layout_below=”@+id/logo”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:layout_marginTop=”20dp” />  
  
        <Button  
            android:layout_width=”fill_parent”  
            android:layout_height=”wrap_content”  
            android:text=”注销”  
            android:id=”@+id/login_btn_cancle”  
            android:textSize=”20dp”  
            android:layout_below=”@+id/login_btn_register”  
            android:layout_marginTop=”10dp”  
            android:layout_alignParentRight=”true”  
            android:layout_alignParentEnd=”true”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:textColor=”#ffffff”  
            android:background=”#3a1313” />  
  
        <CheckBox  
            android:layout_width=”100dp”  
            android:layout_height=”20dp”  
            android:text=”记住密码”  
            android:id=”@+id/Login_Remember”  
            android:layout_below=”@+id/login_edit_pwd”  
            android:layout_alignParentLeft=”true”  
            android:layout_alignParentStart=”true”  
            android:checked=”false”  
            android:textSize=”15dp” />  
  
        <TextView  
            android:layout_width=”60dp”  
            android:layout_height=”20dp”  
            android:text=”修改密码”  
            android:id=”@+id/login_text_change_pwd”  
            android:layout_below=”@+id/login_edit_pwd”  
            android:layout_alignParentRight=”true”  
            android:layout_alignParentEnd=”true”  
            android:textSize=”15dp” />  
    </RelativeLayout>  
    <RelativeLayout  
        android:id=”@+id/login_success_view”  
        android:layout_width=”fill_parent”  
        android:layout_height=”wrap_content”  
        android:layout_centerInParent=”true”  
        android:layout_marginLeft=”15.0px”  
        android:layout_marginRight=”15.0px”  
        android:layout_marginTop=”62.0px”  
        android:background=”#ff3f3f3f”  
        android:paddingBottom=”10.0px”  
        android:paddingTop=”21.0px”  
        android:visibility=”gone” >  
  
        <TextView  
            android:id=”@+id/login_success_show”  
            android:layout_width=”wrap_content”  
            android:layout_height=”wrap_content”  
            android:layout_centerInParent=”true”  
            android:textColor=”#ff3f3f3f”  
            android:textSize=”20.0dip” />  
    </RelativeLayout>  
  
</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.foolishfan.user_v10.Login">
    <RelativeLayout
        android:id="@+id/login_view"
        android:layout_width="400dp"
        android:layout_height="800dp"
        android:layout_centerInParent="true"
         >

        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="注册"
            android:id="@+id/login_btn_register"
            android:onClick="resetpwd"
            android:textColor="#ffffff"
            android:background="#e52525"
            android:textSize="20dp"
            android:layout_below="@+id/login_btn_login"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginTop="10dp" />

        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="登录"
            android:id="@+id/login_btn_login"
            android:onClick="finish_login"
            android:background="#545bcb"
            android:textSize="20dp"
            android:textColor="#ffffff"
            android:layout_below="@+id/login_edit_pwd"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginTop="52dp" />

        <ImageView
            android:layout_width="300dp"
            android:layout_height="150dp"
            android:id="@+id/logo"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_alignWithParentIfMissing="false"
            android:background="#ffffff" />

        <EditText
            android:layout_width="400dp"
            android:layout_height="60dp"
            android:inputType="textPassword"
            android:ems="10"
            android:id="@+id/login_edit_pwd"
            android:drawableLeft="@android:drawable/ic_lock_idle_lock"
            android:hint="请输入您的密码"
            android:layout_below="@+id/login_edit_account"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />

        <EditText
            android:layout_width="400dp"
            android:layout_height="60dp"
            android:inputType="textPersonName"
            android:id="@+id/login_edit_account"
            android:drawableLeft="@android:drawable/ic_menu_myplaces"
            android:hint="请输入您的用户名"
            android:layout_below="@+id/logo"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_marginTop="20dp" />

        <Button
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="注销"
            android:id="@+id/login_btn_cancle"
            android:textSize="20dp"
            android:layout_below="@+id/login_btn_register"
            android:layout_marginTop="10dp"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:textColor="#ffffff"
            android:background="#3a1313" />

        <CheckBox
            android:layout_width="100dp"
            android:layout_height="20dp"
            android:text="记住密码"
            android:id="@+id/Login_Remember"
            android:layout_below="@+id/login_edit_pwd"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:checked="false"
            android:textSize="15dp" />

        <TextView
            android:layout_width="60dp"
            android:layout_height="20dp"
            android:text="修改密码"
            android:id="@+id/login_text_change_pwd"
            android:layout_below="@+id/login_edit_pwd"
            android:layout_alignParentRight="true"
            android:layout_alignParentEnd="true"
            android:textSize="15dp" />
    </RelativeLayout>
    <RelativeLayout
        android:id="@+id/login_success_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginLeft="15.0px"
        android:layout_marginRight="15.0px"
        android:layout_marginTop="62.0px"
        android:background="#ff3f3f3f"
        android:paddingBottom="10.0px"
        android:paddingTop="21.0px"
        android:visibility="gone" >

        <TextView
            android:id="@+id/login_success_show"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:textColor="#ff3f3f3f"
            android:textSize="20.0dip" />
    </RelativeLayout>

</RelativeLayout>

register.xml【注册界面】

<?xml version=“1.0” encoding=“utf-8”?>  
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”  
    android:layout_width=”match_parent”  
    android:layout_height=”match_parent”  
    android:paddingBottom=”@dimen/activity_vertical_margin”  
    android:paddingLeft=”@dimen/activity_horizontal_margin”  
    android:paddingRight=”@dimen/activity_horizontal_margin”  
    android:paddingTop=”@dimen/activity_vertical_margin”  
    android:weightSum=”1”>  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_menu_myplaces”  
        android:layout_width=”wrap_content”  
        android:layout_height=”60dp”  
        android:inputType=”textPersonName”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_name”  
        android:layout_alignParentTop=”true”  
        android:hint=”请输入您的用户名”  
        android:layout_alignLeft=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignStart=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignRight=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignEnd=”@+id/resetpwd_edit_pwd_new” />  
  
    <!–  
  
    <EditText android:id=”@+id/edt_operator_name” style=“@style/syncEditText”  
        android:hint=”@string/hint_operator_name” />  
    <ImageView android:id=”@+id/syncOperatorImg” style=“@style/syncImageView”  
        android:layout_alignLeft=”@+id/edt_operator_name”  
        android:layout_alignTop=”@+id/edt_operator_name”  
        android:layout_alignBottom=”@+id/edt_operator_name” android:src=“@drawable/sync_operator” />  
–>  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
        android:layout_width=”fill_parent”  
        android:layout_height=”60dp”  
        android:inputType=”textPassword”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_pwd_old”  
        android:hint=”请输入您的密码”  
        android:layout_below=”@+id/resetpwd_edit_name”  
        android:layout_alignRight=”@+id/resetpwd_edit_name”  
        android:layout_alignEnd=”@+id/resetpwd_edit_name”  
        android:layout_alignLeft=”@+id/resetpwd_edit_name”  
        android:layout_alignStart=”@+id/resetpwd_edit_name” />  
  
    <Button  
        android:layout_width=”fill_parent”  
        android:layout_height=”wrap_content”  
        android:text=”取消”  
        android:id=”@+id/register_btn_cancel”  
        android:textSize=”20dp”  
        android:background=”#f71818”  
        android:layout_below=”@+id/register_btn_sure”  
        android:layout_alignLeft=”@+id/register_btn_sure”  
        android:layout_alignStart=”@+id/register_btn_sure”  
        android:layout_marginTop=”10dp” />  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
        android:layout_width=”fill_parent”  
        android:layout_height=”60dp”  
        android:inputType=”textPassword”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_pwd_new”  
        android:layout_below=”@+id/resetpwd_edit_pwd_old”  
        android:layout_centerHorizontal=”true”  
        android:hint=”请确认您的密码” />  
  
    <Button  
        android:layout_width=”fill_parent”  
        android:layout_height=”wrap_content”  
        android:text=”确定”  
        android:id=”@+id/register_btn_sure”  
        android:textSize=”20dp”  
        android:background=”#1cf718”  
        android:layout_below=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignLeft=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignStart=”@+id/resetpwd_edit_pwd_new”  
        android:layout_marginTop=”20dp” />  
  
</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:weightSum="1">

    <EditText
        android:drawableLeft="@android:drawable/ic_menu_myplaces"
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:inputType="textPersonName"
        android:ems="10"
        android:id="@+id/resetpwd_edit_name"
        android:layout_alignParentTop="true"
        android:hint="请输入您的用户名"
        android:layout_alignLeft="@+id/resetpwd_edit_pwd_new"
        android:layout_alignStart="@+id/resetpwd_edit_pwd_new"
        android:layout_alignRight="@+id/resetpwd_edit_pwd_new"
        android:layout_alignEnd="@+id/resetpwd_edit_pwd_new" />

    <!--

    <EditText android:id="@+id/edt_operator_name" style="@style/syncEditText"
        android:hint="@string/hint_operator_name" />
    <ImageView android:id="@+id/syncOperatorImg" style="@style/syncImageView"
        android:layout_alignLeft="@+id/edt_operator_name"
        android:layout_alignTop="@+id/edt_operator_name"
        android:layout_alignBottom="@+id/edt_operator_name" android:src="@drawable/sync_operator" />
-->

    <EditText
        android:drawableLeft="@android:drawable/ic_lock_idle_lock"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/resetpwd_edit_pwd_old"
        android:hint="请输入您的密码"
        android:layout_below="@+id/resetpwd_edit_name"
        android:layout_alignRight="@+id/resetpwd_edit_name"
        android:layout_alignEnd="@+id/resetpwd_edit_name"
        android:layout_alignLeft="@+id/resetpwd_edit_name"
        android:layout_alignStart="@+id/resetpwd_edit_name" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="取消"
        android:id="@+id/register_btn_cancel"
        android:textSize="20dp"
        android:background="#f71818"
        android:layout_below="@+id/register_btn_sure"
        android:layout_alignLeft="@+id/register_btn_sure"
        android:layout_alignStart="@+id/register_btn_sure"
        android:layout_marginTop="10dp" />

    <EditText
        android:drawableLeft="@android:drawable/ic_lock_idle_lock"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/resetpwd_edit_pwd_new"
        android:layout_below="@+id/resetpwd_edit_pwd_old"
        android:layout_centerHorizontal="true"
        android:hint="请确认您的密码" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="确定"
        android:id="@+id/register_btn_sure"
        android:textSize="20dp"
        android:background="#1cf718"
        android:layout_below="@+id/resetpwd_edit_pwd_new"
        android:layout_alignLeft="@+id/resetpwd_edit_pwd_new"
        android:layout_alignStart="@+id/resetpwd_edit_pwd_new"
        android:layout_marginTop="20dp" />

</RelativeLayout>

resetpwd.xml【修改密码界面】

<?xml version=“1.0” encoding=“utf-8”?>  
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”  
    android:layout_width=”match_parent”  
    android:layout_height=”match_parent”  
    android:paddingBottom=”@dimen/activity_vertical_margin”  
    android:paddingLeft=”@dimen/activity_horizontal_margin”  
    android:paddingRight=”@dimen/activity_horizontal_margin”  
    android:paddingTop=”@dimen/activity_vertical_margin”  
    android:weightSum=”1”>  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_menu_myplaces”  
        android:layout_width=”wrap_content”  
        android:layout_height=”60dp”  
        android:inputType=”textPersonName”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_name”  
        android:layout_alignParentTop=”true”  
        android:hint=”请输入您的用户名”  
        android:layout_alignLeft=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignStart=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignRight=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignEnd=”@+id/resetpwd_edit_pwd_new” />  
  
    <!–  
  
        <EditText android:id=”@+id/edt_operator_name” style=“@style/syncEditText”  
            android:hint=”@string/hint_operator_name” />  
        <ImageView android:id=”@+id/syncOperatorImg” style=“@style/syncImageView”  
            android:layout_alignLeft=”@+id/edt_operator_name”  
            android:layout_alignTop=”@+id/edt_operator_name”  
            android:layout_alignBottom=”@+id/edt_operator_name” android:src=“@drawable/sync_operator” />  
    –>  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
        android:layout_width=”fill_parent”  
        android:layout_height=”60dp”  
        android:inputType=”textPassword”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_pwd_old”  
        android:hint=”请输入您的旧密码”  
        android:layout_below=”@+id/resetpwd_edit_name”  
        android:layout_alignRight=”@+id/resetpwd_edit_name”  
        android:layout_alignEnd=”@+id/resetpwd_edit_name”  
        android:layout_alignLeft=”@+id/resetpwd_edit_name”  
        android:layout_alignStart=”@+id/resetpwd_edit_name” />  
  
    <Button  
        android:layout_width=”fill_parent”  
        android:layout_height=”wrap_content”  
        android:text=”取消”  
        android:id=”@+id/resetpwd_btn_cancel”  
        android:textSize=”20dp”  
        android:onClick=”not_to_reset”  
        android:background=”#f71818”  
        android:layout_below=”@+id/resetpwd_btn_sure”  
        android:layout_alignParentLeft=”true”  
        android:layout_alignParentStart=”true”  
        android:layout_marginTop=”20dp” />  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
        android:layout_width=”fill_parent”  
        android:layout_height=”60dp”  
        android:inputType=”textPassword”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_pwd_new”  
        android:layout_below=”@+id/resetpwd_edit_pwd_old”  
        android:layout_centerHorizontal=”true”  
        android:hint=”请确认您的新密码”  
        />  
  
    <Button  
        android:layout_width=”fill_parent”  
        android:layout_height=”wrap_content”  
        android:text=”确定”  
        android:id=”@+id/resetpwd_btn_sure”  
        android:textSize=”20dp”  
        android:onClick=”sure_to_reset”  
        android:background=”#1cf718”  
        android:layout_marginTop=”92dp”  
        android:layout_below=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignParentLeft=”true”  
        android:layout_alignParentStart=”true” />  
  
    <EditText  
        android:drawableLeft=”@android:drawable/ic_lock_idle_lock”  
        android:layout_width=”fill_parent”  
        android:layout_height=”60dp”  
        android:inputType=”textPassword”  
        android:ems=”10”  
        android:id=”@+id/resetpwd_edit_pwd_check”  
        android:hint=”请输入您的新密码”  
        android:layout_below=”@+id/resetpwd_edit_pwd_new”  
        android:layout_alignParentLeft=”true”  
        android:layout_alignParentStart=”true” />  
  
</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:weightSum="1">

    <EditText
        android:drawableLeft="@android:drawable/ic_menu_myplaces"
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:inputType="textPersonName"
        android:ems="10"
        android:id="@+id/resetpwd_edit_name"
        android:layout_alignParentTop="true"
        android:hint="请输入您的用户名"
        android:layout_alignLeft="@+id/resetpwd_edit_pwd_new"
        android:layout_alignStart="@+id/resetpwd_edit_pwd_new"
        android:layout_alignRight="@+id/resetpwd_edit_pwd_new"
        android:layout_alignEnd="@+id/resetpwd_edit_pwd_new" />

    <!--

        <EditText android:id="@+id/edt_operator_name" style="@style/syncEditText"
            android:hint="@string/hint_operator_name" />
        <ImageView android:id="@+id/syncOperatorImg" style="@style/syncImageView"
            android:layout_alignLeft="@+id/edt_operator_name"
            android:layout_alignTop="@+id/edt_operator_name"
            android:layout_alignBottom="@+id/edt_operator_name" android:src="@drawable/sync_operator" />
    -->

    <EditText
        android:drawableLeft="@android:drawable/ic_lock_idle_lock"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/resetpwd_edit_pwd_old"
        android:hint="请输入您的旧密码"
        android:layout_below="@+id/resetpwd_edit_name"
        android:layout_alignRight="@+id/resetpwd_edit_name"
        android:layout_alignEnd="@+id/resetpwd_edit_name"
        android:layout_alignLeft="@+id/resetpwd_edit_name"
        android:layout_alignStart="@+id/resetpwd_edit_name" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="取消"
        android:id="@+id/resetpwd_btn_cancel"
        android:textSize="20dp"
        android:onClick="not_to_reset"
        android:background="#f71818"
        android:layout_below="@+id/resetpwd_btn_sure"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="20dp" />

    <EditText
        android:drawableLeft="@android:drawable/ic_lock_idle_lock"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/resetpwd_edit_pwd_new"
        android:layout_below="@+id/resetpwd_edit_pwd_old"
        android:layout_centerHorizontal="true"
        android:hint="请确认您的新密码"
        />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="确定"
        android:id="@+id/resetpwd_btn_sure"
        android:textSize="20dp"
        android:onClick="sure_to_reset"
        android:background="#1cf718"
        android:layout_marginTop="92dp"
        android:layout_below="@+id/resetpwd_edit_pwd_new"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <EditText
        android:drawableLeft="@android:drawable/ic_lock_idle_lock"
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:inputType="textPassword"
        android:ems="10"
        android:id="@+id/resetpwd_edit_pwd_check"
        android:hint="请输入您的新密码"
        android:layout_below="@+id/resetpwd_edit_pwd_new"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

user.xml【个人中心】

<?xml version=“1.0” encoding=“utf-8”?>  
<RelativeLayout xmlns:android=”http://schemas.android.com/apk/res/android”  
    android:layout_width=”match_parent”  
    android:layout_height=”match_parent”  
    android:paddingBottom=”@dimen/activity_vertical_margin”  
    android:paddingLeft=”@dimen/activity_horizontal_margin”  
    android:paddingRight=”@dimen/activity_horizontal_margin”  
    android:paddingTop=”@dimen/activity_vertical_margin”>  
  
    <TextView  
        android:layout_width=”wrap_content”  
        android:layout_height=”wrap_content”  
        android:textAppearance=”?android:attr/textAppearanceLarge”  
        android:text=”FooilshFan您好，欢迎回来！”  
        android:id=”@+id/textView”  
        android:layout_centerHorizontal=”true”  
        android:layout_marginLeft=”50dp”  
        android:layout_marginTop=”6dp”  
        android:textSize=”16dp” />  
  
    <Button  
        android:layout_width=”wrap_content”  
        android:layout_height=”wrap_content”  
        android:text=”退出”  
        android:id=”@+id/returnback”  
        android:layout_below=”@+id/textView”  
        android:layout_marginTop=”36dp”  
        android:onClick=”back_to_login”  
        android:textColor=”#ffffff”  
        android:textSize=”20dp”  
        android:background=”#d95b5b”  
        android:layout_alignParentLeft=”true”  
        android:layout_alignParentStart=”true”  
        android:layout_alignParentRight=”true”  
        android:layout_alignParentEnd=”true” />  
  
</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="FooilshFan您好，欢迎回来！"
        android:id="@+id/textView"
        android:layout_centerHorizontal="true"
        android:layout_marginLeft="50dp"
        android:layout_marginTop="6dp"
        android:textSize="16dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="退出"
        android:id="@+id/returnback"
        android:layout_below="@+id/textView"
        android:layout_marginTop="36dp"
        android:onClick="back_to_login"
        android:textColor="#ffffff"
        android:textSize="20dp"
        android:background="#d95b5b"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

2：用户数据管理的类

UserData.java 【用户数据】

package com.example.foolishfan.user_v10;  
public class UserData {  
    private String userName;                  //用户名  
    private String userPwd;                   //用户密码  
    private int userId;                       //用户ID号  
    public int pwdresetFlag=0;  
    //获取用户名  
    public String getUserName() {             //获取用户名  
        return userName;  
    }  
    //设置用户名  
    public void setUserName(String userName) {  //输入用户名  
        this.userName = userName;  
    }  
    //获取用户密码  
    public String getUserPwd() {                //获取用户密码  
        return userPwd;  
    }  
    //设置用户密码  
    public void setUserPwd(String userPwd) {     //输入用户密码  
        this.userPwd = userPwd;  
    }  
    //获取用户id  
    public int getUserId() {                   //获取用户ID号  
        return userId;  
    }  
    //设置用户id  
    public void setUserId(int userId) {       //设置用户ID号  
        this.userId = userId;  
    }  
    public UserData(String userName, String userPwd) {  //这里只采用用户名和密码  
        super();  
        this.userName = userName;  
        this.userPwd = userPwd;  
    }  
  
}  

package com.example.foolishfan.user_v10;
public class UserData {
    private String userName;                  //用户名
    private String userPwd;                   //用户密码
    private int userId;                       //用户ID号
    public int pwdresetFlag=0;
    //获取用户名
    public String getUserName() {             //获取用户名
        return userName;
    }
    //设置用户名
    public void setUserName(String userName) {  //输入用户名
        this.userName = userName;
    }
    //获取用户密码
    public String getUserPwd() {                //获取用户密码
        return userPwd;
    }
    //设置用户密码
    public void setUserPwd(String userPwd) {     //输入用户密码
        this.userPwd = userPwd;
    }
    //获取用户id
    public int getUserId() {                   //获取用户ID号
        return userId;
    }
    //设置用户id
    public void setUserId(int userId) {       //设置用户ID号
        this.userId = userId;
    }
    public UserData(String userName, String userPwd) {  //这里只采用用户名和密码
        super();
        this.userName = userName;
        this.userPwd = userPwd;
    }

}

UserDataManager.java【用户管理】

package com.example.foolishfan.user_v10;  
import android.content.ContentValues;  
import android.content.Context;  
import android.database.Cursor;  
import android.database.SQLException;  
import android.database.sqlite.SQLiteDatabase;  
import android.database.sqlite.SQLiteOpenHelper;  
import android.util.Log;  
  
public class UserDataManager {             //用户数据管理类  
    //一些宏定义和声明  
    private static final String TAG = “UserDataManager”;  
    private static final String DB_NAME = “user_data”;  
    private static final String TABLE_NAME = “users”;  
    public static final String ID = “_id”;  
    public static final String USER_NAME = “user_name”;  
    public static final String USER_PWD = “user_pwd”;  
//    public static final String SILENT = “silent”;  
//    public static final String VIBRATE = “vibrate”;  
    private static final int DB_VERSION = 2;  
    private Context mContext = null;  
  
    //创建用户book表  
    private static final String DB_CREATE = “CREATE TABLE ” + TABLE_NAME + “ (“  
            + ID + ” integer primary key,” + USER_NAME + “ varchar,”  
            + USER_PWD + ” varchar” + “);”;  
  
    private SQLiteDatabase mSQLiteDatabase = null;  
    private DataBaseManagementHelper mDatabaseHelper = null;  
  
    //DataBaseManagementHelper继承自SQLiteOpenHelper  
    private static class DataBaseManagementHelper extends SQLiteOpenHelper {  
  
        DataBaseManagementHelper(Context context) {  
            super(context, DB_NAME, null, DB_VERSION);  
        }  
  
        @Override  
        public void onCreate(SQLiteDatabase db) {  
            Log.i(TAG,”db.getVersion()=”+db.getVersion());  
            db.execSQL(”DROP TABLE IF EXISTS ” + TABLE_NAME + “;”);  
            db.execSQL(DB_CREATE);  
            Log.i(TAG, ”db.execSQL(DB_CREATE)”);  
            Log.e(TAG, DB_CREATE);  
        }  
  
        @Override  
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  
            Log.i(TAG, ”DataBaseManagementHelper onUpgrade”);  
            onCreate(db);  
        }  
    }  
  
    public UserDataManager(Context context) {  
        mContext = context;  
        Log.i(TAG, ”UserDataManager construction!”);  
    }  
    //打开数据库  
    public void openDataBase() throws SQLException {  
        mDatabaseHelper = new DataBaseManagementHelper(mContext);  
        mSQLiteDatabase = mDatabaseHelper.getWritableDatabase();  
    }  
    //关闭数据库  
    public void closeDataBase() throws SQLException {  
        mDatabaseHelper.close();  
    }  
    //添加新用户，即注册  
    public long insertUserData(UserData userData) {  
        String userName=userData.getUserName();  
        String userPwd=userData.getUserPwd();  
        ContentValues values = new ContentValues();  
        values.put(USER_NAME, userName);  
        values.put(USER_PWD, userPwd);  
        return mSQLiteDatabase.insert(TABLE_NAME, ID, values);  
    }  
    //更新用户信息，如修改密码  
    public boolean updateUserData(UserData userData) {  
        //int id = userData.getUserId();  
        String userName = userData.getUserName();  
        String userPwd = userData.getUserPwd();  
        ContentValues values = new ContentValues();  
        values.put(USER_NAME, userName);  
        values.put(USER_PWD, userPwd);  
        return mSQLiteDatabase.update(TABLE_NAME, values,null, null) > 0;  
        //return mSQLiteDatabase.update(TABLE_NAME, values, ID + ”=” + id, null) > 0;  
    }  
    //  
    public Cursor fetchUserData(int id) throws SQLException {  
        Cursor mCursor = mSQLiteDatabase.query(false, TABLE_NAME, null, ID  
                + ”=” + id, null, null, null, null, null);  
        if (mCursor != null) {  
            mCursor.moveToFirst();  
        }  
        return mCursor;  
    }  
    //  
    public Cursor fetchAllUserDatas() {  
        return mSQLiteDatabase.query(TABLE_NAME, null, null, null, null, null,  
                null);  
    }  
    //根据id删除用户  
    public boolean deleteUserData(int id) {  
        return mSQLiteDatabase.delete(TABLE_NAME, ID + “=” + id, null) > 0;  
    }  
    //根据用户名注销  
    public boolean deleteUserDatabyname(String name) {  
        return mSQLiteDatabase.delete(TABLE_NAME, USER_NAME + “=” + name, null) > 0;  
    }  
    //删除所有用户  
    public boolean deleteAllUserDatas() {  
        return mSQLiteDatabase.delete(TABLE_NAME, null, null) > 0;  
    }  
  
    //  
    public String getStringByColumnName(String columnName, int id) {  
        Cursor mCursor = fetchUserData(id);  
        int columnIndex = mCursor.getColumnIndex(columnName);  
        String columnValue = mCursor.getString(columnIndex);  
        mCursor.close();  
        return columnValue;  
    }  
    //  
    public boolean updateUserDataById(String columnName, int id,  
                                      String columnValue) {  
        ContentValues values = new ContentValues();  
        values.put(columnName, columnValue);  
        return mSQLiteDatabase.update(TABLE_NAME, values, ID + “=” + id, null) > 0;  
    }  
    //根据用户名找用户，可以判断注册时用户名是否已经存在  
    public int findUserByName(String userName){  
        Log.i(TAG,”findUserByName , userName=”+userName);  
        int result=0;  
        Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+“=”+userName, null, null, null, null);  
        if(mCursor!=null){  
            result=mCursor.getCount();  
            mCursor.close();  
            Log.i(TAG,”findUserByName , result=”+result);  
        }  
        return result;  
    }  
    //根据用户名和密码找用户，用于登录  
    public int findUserByNameAndPwd(String userName,String pwd){  
        Log.i(TAG,”findUserByNameAndPwd”);  
        int result=0;  
        Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+“=”+userName+“ and ”+USER_PWD+“=”+pwd,  
                null, null, null, null);  
        if(mCursor!=null){  
            result=mCursor.getCount();  
            mCursor.close();  
            Log.i(TAG,”findUserByNameAndPwd , result=”+result);  
        }  
        return result;  
    }  
  
}  

package com.example.foolishfan.user_v10;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class UserDataManager {             //用户数据管理类
    //一些宏定义和声明
    private static final String TAG = "UserDataManager";
    private static final String DB_NAME = "user_data";
    private static final String TABLE_NAME = "users";
    public static final String ID = "_id";
    public static final String USER_NAME = "user_name";
    public static final String USER_PWD = "user_pwd";
//    public static final String SILENT = "silent";
//    public static final String VIBRATE = "vibrate";
    private static final int DB_VERSION = 2;
    private Context mContext = null;

    //创建用户book表
    private static final String DB_CREATE = "CREATE TABLE " + TABLE_NAME + " ("
            + ID + " integer primary key," + USER_NAME + " varchar,"
            + USER_PWD + " varchar" + ");";

    private SQLiteDatabase mSQLiteDatabase = null;
    private DataBaseManagementHelper mDatabaseHelper = null;

    //DataBaseManagementHelper继承自SQLiteOpenHelper
    private static class DataBaseManagementHelper extends SQLiteOpenHelper {

        DataBaseManagementHelper(Context context) {
            super(context, DB_NAME, null, DB_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            Log.i(TAG,"db.getVersion()="+db.getVersion());
            db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME + ";");
            db.execSQL(DB_CREATE);
            Log.i(TAG, "db.execSQL(DB_CREATE)");
            Log.e(TAG, DB_CREATE);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.i(TAG, "DataBaseManagementHelper onUpgrade");
            onCreate(db);
        }
    }

    public UserDataManager(Context context) {
        mContext = context;
        Log.i(TAG, "UserDataManager construction!");
    }
    //打开数据库
    public void openDataBase() throws SQLException {
        mDatabaseHelper = new DataBaseManagementHelper(mContext);
        mSQLiteDatabase = mDatabaseHelper.getWritableDatabase();
    }
    //关闭数据库
    public void closeDataBase() throws SQLException {
        mDatabaseHelper.close();
    }
    //添加新用户，即注册
    public long insertUserData(UserData userData) {
        String userName=userData.getUserName();
        String userPwd=userData.getUserPwd();
        ContentValues values = new ContentValues();
        values.put(USER_NAME, userName);
        values.put(USER_PWD, userPwd);
        return mSQLiteDatabase.insert(TABLE_NAME, ID, values);
    }
    //更新用户信息，如修改密码
    public boolean updateUserData(UserData userData) {
        //int id = userData.getUserId();
        String userName = userData.getUserName();
        String userPwd = userData.getUserPwd();
        ContentValues values = new ContentValues();
        values.put(USER_NAME, userName);
        values.put(USER_PWD, userPwd);
        return mSQLiteDatabase.update(TABLE_NAME, values,null, null) > 0;
        //return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0;
    }
    //
    public Cursor fetchUserData(int id) throws SQLException {
        Cursor mCursor = mSQLiteDatabase.query(false, TABLE_NAME, null, ID
                + "=" + id, null, null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;
    }
    //
    public Cursor fetchAllUserDatas() {
        return mSQLiteDatabase.query(TABLE_NAME, null, null, null, null, null,
                null);
    }
    //根据id删除用户
    public boolean deleteUserData(int id) {
        return mSQLiteDatabase.delete(TABLE_NAME, ID + "=" + id, null) > 0;
    }
    //根据用户名注销
    public boolean deleteUserDatabyname(String name) {
        return mSQLiteDatabase.delete(TABLE_NAME, USER_NAME + "=" + name, null) > 0;
    }
    //删除所有用户
    public boolean deleteAllUserDatas() {
        return mSQLiteDatabase.delete(TABLE_NAME, null, null) > 0;
    }

    //
    public String getStringByColumnName(String columnName, int id) {
        Cursor mCursor = fetchUserData(id);
        int columnIndex = mCursor.getColumnIndex(columnName);
        String columnValue = mCursor.getString(columnIndex);
        mCursor.close();
        return columnValue;
    }
    //
    public boolean updateUserDataById(String columnName, int id,
                                      String columnValue) {
        ContentValues values = new ContentValues();
        values.put(columnName, columnValue);
        return mSQLiteDatabase.update(TABLE_NAME, values, ID + "=" + id, null) > 0;
    }
    //根据用户名找用户，可以判断注册时用户名是否已经存在
    public int findUserByName(String userName){
        Log.i(TAG,"findUserByName , userName="+userName);
        int result=0;
        Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName, null, null, null, null);
        if(mCursor!=null){
            result=mCursor.getCount();
            mCursor.close();
            Log.i(TAG,"findUserByName , result="+result);
        }
        return result;
    }
    //根据用户名和密码找用户，用于登录
    public int findUserByNameAndPwd(String userName,String pwd){
        Log.i(TAG,"findUserByNameAndPwd");
        int result=0;
        Cursor mCursor=mSQLiteDatabase.query(TABLE_NAME, null, USER_NAME+"="+userName+" and "+USER_PWD+"="+pwd,
                null, null, null, null);
        if(mCursor!=null){
            result=mCursor.getCount();
            mCursor.close();
            Log.i(TAG,"findUserByNameAndPwd , result="+result);
        }
        return result;
    }

}

3：具体操作的实现代码，即各个activity

    Login.java【用户登录activity】

package com.example.foolishfan.user_v10;  
  
import android.app.Activity;  
import android.content.Intent;  
import android.content.SharedPreferences;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.CheckBox;  
import android.widget.EditText;  
import android.widget.ImageView;  
import android.widget.TextView;  
import android.widget.Toast;  
  
public class Login extends Activity {                 //登录界面活动  
  
    public int pwdresetFlag=0;  
    private EditText mAccount;                        //用户名编辑  
    private EditText mPwd;                            //密码编辑  
    private Button mRegisterButton;                   //注册按钮  
    private Button mLoginButton;                      //登录按钮  
    private Button mCancleButton;                     //注销按钮  
    private CheckBox mRememberCheck;  
  
    private SharedPreferences login_sp;  
    private String userNameValue,passwordValue;  
  
    private View loginView;                           //登录  
    private View loginSuccessView;  
    private TextView loginSuccessShow;  
    private TextView mChangepwdText;  
    private UserDataManager mUserDataManager;         //用户数据管理类  
  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.login);  
        //通过id找到相应的控件  
        mAccount = (EditText) findViewById(R.id.login_edit_account);  
        mPwd = (EditText) findViewById(R.id.login_edit_pwd);  
        mRegisterButton = (Button) findViewById(R.id.login_btn_register);  
        mLoginButton = (Button) findViewById(R.id.login_btn_login);  
        mCancleButton = (Button) findViewById(R.id.login_btn_cancle);  
        loginView=findViewById(R.id.login_view);  
        loginSuccessView=findViewById(R.id.login_success_view);  
        loginSuccessShow=(TextView) findViewById(R.id.login_success_show);  
  
        mChangepwdText = (TextView) findViewById(R.id.login_text_change_pwd);  
  
        mRememberCheck = (CheckBox) findViewById(R.id.Login_Remember);  
  
        login_sp = getSharedPreferences(”userInfo”, 0);  
        String name=login_sp.getString(”USER_NAME”, “”);  
        String pwd =login_sp.getString(”PASSWORD”, “”);  
        boolean choseRemember =login_sp.getBoolean(“mRememberCheck”, false);  
        boolean choseAutoLogin =login_sp.getBoolean(“mAutologinCheck”, false);  
        //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码  
        if(choseRemember){  
            mAccount.setText(name);  
            mPwd.setText(pwd);  
            mRememberCheck.setChecked(true);  
        }  
  
        mRegisterButton.setOnClickListener(mListener);                      //采用OnClickListener方法设置不同按钮按下之后的监听事件  
        mLoginButton.setOnClickListener(mListener);  
        mCancleButton.setOnClickListener(mListener);  
        mChangepwdText.setOnClickListener(mListener);  
  
        ImageView image = (ImageView) findViewById(R.id.logo);             //使用ImageView显示logo  
        image.setImageResource(R.drawable.logo);  
  
        if (mUserDataManager == null) {  
            mUserDataManager = new UserDataManager(this);  
            mUserDataManager.openDataBase();                              //建立本地数据库  
        }  
    }  
    OnClickListener mListener = new OnClickListener() {                  //不同按钮按下的监听事件选择  
        public void onClick(View v) {  
            switch (v.getId()) {  
                case R.id.login_btn_register:                            //登录界面的注册按钮  
                    Intent intent_Login_to_Register = new Intent(Login.this,Register.class) ;    //切换Login Activity至User Activity  
                    startActivity(intent_Login_to_Register);  
                    finish();  
                    break;  
                case R.id.login_btn_login:                              //登录界面的登录按钮  
                    login();  
                    break;  
                case R.id.login_btn_cancle:                             //登录界面的注销按钮  
                    cancel();  
                    break;  
                case R.id.login_text_change_pwd:                             //登录界面的注销按钮  
                    Intent intent_Login_to_reset = new Intent(Login.this,Resetpwd.class) ;    //切换Login Activity至User Activity  
                    startActivity(intent_Login_to_reset);  
                    finish();  
                    break;  
            }  
        }  
    };  
  
    public void login() {                                              //登录按钮监听事件  
        if (isUserNameAndPwdValid()) {  
            String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息  
            String userPwd = mPwd.getText().toString().trim();  
            SharedPreferences.Editor editor =login_sp.edit();  
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);  
            if(result==1){                                             //返回1说明用户名和密码均正确  
                //保存用户名和密码  
                editor.putString(”USER_NAME”, userName);  
                editor.putString(”PASSWORD”, userPwd);  
  
                //是否记住密码  
                if(mRememberCheck.isChecked()){  
                    editor.putBoolean(”mRememberCheck”, true);  
                }else{  
                    editor.putBoolean(”mRememberCheck”, false);  
                }  
                editor.commit();  
  
                Intent intent = new Intent(Login.this,User.class) ;    //切换Login Activity至User Activity  
                startActivity(intent);  
                finish();  
                Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示  
            }else if(result==0){  
                Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show();  //登录失败提示  
            }  
        }  
    }  
    public void cancel() {           //注销  
        if (isUserNameAndPwdValid()) {  
            String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息  
            String userPwd = mPwd.getText().toString().trim();  
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);  
            if(result==1){                                             //返回1说明用户名和密码均正确  
                Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();<span style=“font-family: Arial;”>//注销成功提示</span>  
                mPwd.setText(”“);  
                mAccount.setText(”“);  
                mUserDataManager.deleteUserDatabyname(userName);  
            }else if(result==0){  
                Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show();  //注销失败提示  
            }  
        }  
  
    }  
    public boolean isUserNameAndPwdValid() {  
        if (mAccount.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.account_empty),  
                    Toast.LENGTH_SHORT).show();  
            return false;  
        } else if (mPwd.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_empty),  
                    Toast.LENGTH_SHORT).show();  
            return false;  
        }  
        return true;  
    }  
    @Override  
    protected void onResume() {  
        if (mUserDataManager == null) {  
            mUserDataManager = new UserDataManager(this);  
            mUserDataManager.openDataBase();  
        }  
        super.onResume();  
    }  
    @Override  
    protected void onDestroy() {  
        super.onDestroy();  
    }  
    @Override  
    protected void onPause() {  
        if (mUserDataManager != null) {  
            mUserDataManager.closeDataBase();  
            mUserDataManager = null;  
        }  
        super.onPause();  
    }  
}  

package com.example.foolishfan.user_v10;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class Login extends Activity {                 //登录界面活动

    public int pwdresetFlag=0;
    private EditText mAccount;                        //用户名编辑
    private EditText mPwd;                            //密码编辑
    private Button mRegisterButton;                   //注册按钮
    private Button mLoginButton;                      //登录按钮
    private Button mCancleButton;                     //注销按钮
    private CheckBox mRememberCheck;

    private SharedPreferences login_sp;
    private String userNameValue,passwordValue;

    private View loginView;                           //登录
    private View loginSuccessView;
    private TextView loginSuccessShow;
    private TextView mChangepwdText;
    private UserDataManager mUserDataManager;         //用户数据管理类


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        //通过id找到相应的控件
        mAccount = (EditText) findViewById(R.id.login_edit_account);
        mPwd = (EditText) findViewById(R.id.login_edit_pwd);
        mRegisterButton = (Button) findViewById(R.id.login_btn_register);
        mLoginButton = (Button) findViewById(R.id.login_btn_login);
        mCancleButton = (Button) findViewById(R.id.login_btn_cancle);
        loginView=findViewById(R.id.login_view);
        loginSuccessView=findViewById(R.id.login_success_view);
        loginSuccessShow=(TextView) findViewById(R.id.login_success_show);

        mChangepwdText = (TextView) findViewById(R.id.login_text_change_pwd);

        mRememberCheck = (CheckBox) findViewById(R.id.Login_Remember);

        login_sp = getSharedPreferences("userInfo", 0);
        String name=login_sp.getString("USER_NAME", "");
        String pwd =login_sp.getString("PASSWORD", "");
        boolean choseRemember =login_sp.getBoolean("mRememberCheck", false);
        boolean choseAutoLogin =login_sp.getBoolean("mAutologinCheck", false);
        //如果上次选了记住密码，那进入登录页面也自动勾选记住密码，并填上用户名和密码
        if(choseRemember){
            mAccount.setText(name);
            mPwd.setText(pwd);
            mRememberCheck.setChecked(true);
        }

        mRegisterButton.setOnClickListener(mListener);                      //采用OnClickListener方法设置不同按钮按下之后的监听事件
        mLoginButton.setOnClickListener(mListener);
        mCancleButton.setOnClickListener(mListener);
        mChangepwdText.setOnClickListener(mListener);

        ImageView image = (ImageView) findViewById(R.id.logo);             //使用ImageView显示logo
        image.setImageResource(R.drawable.logo);

        if (mUserDataManager == null) {
            mUserDataManager = new UserDataManager(this);
            mUserDataManager.openDataBase();                              //建立本地数据库
        }
    }
    OnClickListener mListener = new OnClickListener() {                  //不同按钮按下的监听事件选择
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.login_btn_register:                            //登录界面的注册按钮
                    Intent intent_Login_to_Register = new Intent(Login.this,Register.class) ;    //切换Login Activity至User Activity
                    startActivity(intent_Login_to_Register);
                    finish();
                    break;
                case R.id.login_btn_login:                              //登录界面的登录按钮
                    login();
                    break;
                case R.id.login_btn_cancle:                             //登录界面的注销按钮
                    cancel();
                    break;
                case R.id.login_text_change_pwd:                             //登录界面的注销按钮
                    Intent intent_Login_to_reset = new Intent(Login.this,Resetpwd.class) ;    //切换Login Activity至User Activity
                    startActivity(intent_Login_to_reset);
                    finish();
                    break;
            }
        }
    };

    public void login() {                                              //登录按钮监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息
            String userPwd = mPwd.getText().toString().trim();
            SharedPreferences.Editor editor =login_sp.edit();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
            if(result==1){                                             //返回1说明用户名和密码均正确
                //保存用户名和密码
                editor.putString("USER_NAME", userName);
                editor.putString("PASSWORD", userPwd);

                //是否记住密码
                if(mRememberCheck.isChecked()){
                    editor.putBoolean("mRememberCheck", true);
                }else{
                    editor.putBoolean("mRememberCheck", false);
                }
                editor.commit();

                Intent intent = new Intent(Login.this,User.class) ;    //切换Login Activity至User Activity
                startActivity(intent);
                finish();
                Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示
            }else if(result==0){
                Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show();  //登录失败提示
            }
        }
    }
    public void cancel() {           //注销
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息
            String userPwd = mPwd.getText().toString().trim();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
            if(result==1){                                             //返回1说明用户名和密码均正确
                Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();<span style="font-family: Arial;">//注销成功提示</span>
                mPwd.setText("");
                mAccount.setText("");
                mUserDataManager.deleteUserDatabyname(userName);
            }else if(result==0){
                Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show();  //注销失败提示
            }
        }

    }
    public boolean isUserNameAndPwdValid() {
        if (mAccount.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.account_empty),
                    Toast.LENGTH_SHORT).show();
            return false;
        } else if (mPwd.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_empty),
                    Toast.LENGTH_SHORT).show();
            return false;
        }
        return true;
    }
    @Override
    protected void onResume() {
        if (mUserDataManager == null) {
            mUserDataManager = new UserDataManager(this);
            mUserDataManager.openDataBase();
        }
        super.onResume();
    }
    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
    @Override
    protected void onPause() {
        if (mUserDataManager != null) {
            mUserDataManager.closeDataBase();
            mUserDataManager = null;
        }
        super.onPause();
    }
}

Register.java【用户注册activity】

[java] view plain copy
package com.example.foolishfan.user_v10;  
  
import android.app.Activity;  
import android.content.Intent;  
import android.support.v7.app.AppCompatActivity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.Toast;  
  
public class Register extends AppCompatActivity {  
    private EditText mAccount;                        //用户名编辑  
    private EditText mPwd;                            //密码编辑  
    private EditText mPwdCheck;                       //密码编辑  
    private Button mSureButton;                       //确定按钮  
    private Button mCancelButton;                     //取消按钮  
    private UserDataManager mUserDataManager;         //用户数据管理类  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.register);  
        mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);  
        mPwd = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);  
        mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);  
  
        mSureButton = (Button) findViewById(R.id.register_btn_sure);  
        mCancelButton = (Button) findViewById(R.id.register_btn_cancel);  
  
        mSureButton.setOnClickListener(m_register_Listener);      //注册界面两个按钮的监听事件  
        mCancelButton.setOnClickListener(m_register_Listener);  
  
        if (mUserDataManager == null) {  
            mUserDataManager = new UserDataManager(this);  
            mUserDataManager.openDataBase();                              //建立本地数据库  
        }  
    }  
    View.OnClickListener m_register_Listener = new View.OnClickListener() {    //不同按钮按下的监听事件选择  
        public void onClick(View v) {  
            switch (v.getId()) {  
                case R.id.register_btn_sure:                       //确认按钮的监听事件  
                    register_check();  
                    break;  
                case R.id.register_btn_cancel:                     //取消按钮的监听事件,由注册界面返回登录界面  
                    Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;    //切换User Activity至Login Activity  
                    startActivity(intent_Register_to_Login);  
                    finish();  
                    break;  
            }  
        }  
    };  
    public void register_check() {                                //确认按钮的监听事件  
        if (isUserNameAndPwdValid()) {  
            String userName = mAccount.getText().toString().trim();  
            String userPwd = mPwd.getText().toString().trim();  
            String userPwdCheck = mPwdCheck.getText().toString().trim();  
            //检查用户是否存在  
            int count=mUserDataManager.findUserByName(userName);  
            //用户已经存在时返回，给出提示文字  
            if(count>0){  
                Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();  
                return ;  
            }  
            if(userPwd.equals(userPwdCheck)==false){     //两次密码输入不一样  
                Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();  
                return ;  
            } else {  
                UserData mUser = new UserData(userName, userPwd);  
                mUserDataManager.openDataBase();  
                long flag = mUserDataManager.insertUserData(mUser); //新建用户信息  
                if (flag == -1) {  
                    Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();  
                }else{  
                    Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();  
                    Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;    //切换User Activity至Login Activity  
                    startActivity(intent_Register_to_Login);  
                    finish();  
                }  
            }  
        }  
    }  
    public boolean isUserNameAndPwdValid() {  
        if (mAccount.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.account_empty),  
                    Toast.LENGTH_SHORT).show();  
            return false;  
        } else if (mPwd.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_empty),  
                    Toast.LENGTH_SHORT).show();  
            return false;  
        }else if(mPwdCheck.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_check_empty),  
                    Toast.LENGTH_SHORT).show();  
            return false;  
        }  
        return true;  
    }  
}  

package com.example.foolishfan.user_v10;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class Register extends AppCompatActivity {
    private EditText mAccount;                        //用户名编辑
    private EditText mPwd;                            //密码编辑
    private EditText mPwdCheck;                       //密码编辑
    private Button mSureButton;                       //确定按钮
    private Button mCancelButton;                     //取消按钮
    private UserDataManager mUserDataManager;         //用户数据管理类
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);
        mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);
        mPwd = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);
        mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);

        mSureButton = (Button) findViewById(R.id.register_btn_sure);
        mCancelButton = (Button) findViewById(R.id.register_btn_cancel);

        mSureButton.setOnClickListener(m_register_Listener);      //注册界面两个按钮的监听事件
        mCancelButton.setOnClickListener(m_register_Listener);

        if (mUserDataManager == null) {
            mUserDataManager = new UserDataManager(this);
            mUserDataManager.openDataBase();                              //建立本地数据库
        }
    }
    View.OnClickListener m_register_Listener = new View.OnClickListener() {    //不同按钮按下的监听事件选择
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.register_btn_sure:                       //确认按钮的监听事件
                    register_check();
                    break;
                case R.id.register_btn_cancel:                     //取消按钮的监听事件,由注册界面返回登录界面
                    Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;    //切换User Activity至Login Activity
                    startActivity(intent_Register_to_Login);
                    finish();
                    break;
            }
        }
    };
    public void register_check() {                                //确认按钮的监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();
            String userPwd = mPwd.getText().toString().trim();
            String userPwdCheck = mPwdCheck.getText().toString().trim();
            //检查用户是否存在
            int count=mUserDataManager.findUserByName(userName);
            //用户已经存在时返回，给出提示文字
            if(count>0){
                Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
                return ;
            }
            if(userPwd.equals(userPwdCheck)==false){     //两次密码输入不一样
                Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
                return ;
            } else {
                UserData mUser = new UserData(userName, userPwd);
                mUserDataManager.openDataBase();
                long flag = mUserDataManager.insertUserData(mUser); //新建用户信息
                if (flag == -1) {
                    Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();
                    Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;    //切换User Activity至Login Activity
                    startActivity(intent_Register_to_Login);
                    finish();
                }
            }
        }
    }
    public boolean isUserNameAndPwdValid() {
        if (mAccount.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.account_empty),
                    Toast.LENGTH_SHORT).show();
            return false;
        } else if (mPwd.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_empty),
                    Toast.LENGTH_SHORT).show();
            return false;
        }else if(mPwdCheck.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_check_empty),
                    Toast.LENGTH_SHORT).show();
            return false;
        }
        return true;
    }
}

Resetpwd.java【重新设置密码】

package com.example.foolishfan.user_v10;  
import android.app.Activity;  
import android.content.Intent;  
import android.support.v7.app.AppCompatActivity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.RelativeLayout;  
import android.widget.Toast;  
  
public class Resetpwd extends AppCompatActivity {  
    private EditText mAccount;                        //用户名编辑  
    private EditText mPwd_old;                        //密码编辑  
    private EditText mPwd_new;                        //密码编辑  
    private EditText mPwdCheck;                       //密码编辑  
    private Button mSureButton;                       //确定按钮  
    private Button mCancelButton;                     //取消按钮  
    private UserDataManager mUserDataManager;         //用户数据管理类  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.resetpwd);  
        mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);  
        mPwd_old = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);  
        mPwd_new = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);  
        mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_check);  
  
        mSureButton = (Button) findViewById(R.id.resetpwd_btn_sure);  
        mCancelButton = (Button) findViewById(R.id.resetpwd_btn_cancel);  
  
        mSureButton.setOnClickListener(m_resetpwd_Listener);      //注册界面两个按钮的监听事件  
        mCancelButton.setOnClickListener(m_resetpwd_Listener);  
        if (mUserDataManager == null) {  
            mUserDataManager = new UserDataManager(this);  
            mUserDataManager.openDataBase();                              //建立本地数据库  
        }  
    }  
    View.OnClickListener m_resetpwd_Listener = new View.OnClickListener() {    //不同按钮按下的监听事件选择  
        public void onClick(View v) {  
            switch (v.getId()) {  
                case R.id.resetpwd_btn_sure:                       //确认按钮的监听事件  
                    resetpwd_check();  
                    break;  
                case R.id.resetpwd_btn_cancel:                     //取消按钮的监听事件,由注册界面返回登录界面  
                    Intent intent_Resetpwd_to_Login = new Intent(Resetpwd.this,Login.class) ;    //切换Resetpwd Activity至Login Activity  
                    startActivity(intent_Resetpwd_to_Login);  
                    finish();  
                    break;  
            }  
        }  
    };  
    public void resetpwd_check() {                                //确认按钮的监听事件  
        if (isUserNameAndPwdValid()) {  
            String userName = mAccount.getText().toString().trim();  
            String userPwd_old = mPwd_old.getText().toString().trim();  
            String userPwd_new = mPwd_new.getText().toString().trim();  
            String userPwdCheck = mPwdCheck.getText().toString().trim();  
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);  
            if(result==1){                                             //返回1说明用户名和密码均正确,继续后续操作  
                if(userPwd_new.equals(userPwdCheck)==false){           //两次密码输入不一样  
                    Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();  
                    return ;  
                } else {  
                    UserData mUser = new UserData(userName, userPwd_new);  
                    mUserDataManager.openDataBase();  
                    boolean flag = mUserDataManager.updateUserData(mUser);  
                    if (flag == false) {  
                        Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();  
                    }else{  
                        Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();  
                        mUser.pwdresetFlag=1;  
                        Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ;    //切换User Activity至Login Activity  
                        startActivity(intent_Register_to_Login);  
                        finish();  
                    }  
                }  
            }else if(result==0){                                       //返回0说明用户名和密码不匹配，重新输入  
                Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();  
                return;  
            }  
        }  
    }  
    public boolean isUserNameAndPwdValid() {  
        String userName = mAccount.getText().toString().trim();  
        //检查用户是否存在  
        int count=mUserDataManager.findUserByName(userName);  
        //用户不存在时返回，给出提示文字  
        if(count<=0){  
            Toast.makeText(this, getString(R.string.name_not_exist, userName),Toast.LENGTH_SHORT).show();  
            return false;  
        }  
        if (mAccount.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.account_empty),Toast.LENGTH_SHORT).show();  
            return false;  
        } else if (mPwd_old.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_empty),Toast.LENGTH_SHORT).show();  
            return false;  
        } else if (mPwd_new.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_new_empty),Toast.LENGTH_SHORT).show();  
            return false;  
        }else if(mPwdCheck.getText().toString().trim().equals(“”)) {  
            Toast.makeText(this, getString(R.string.pwd_check_empty),Toast.LENGTH_SHORT).show();  
            return false;  
        }  
        return true;  
    }  
}  

package com.example.foolishfan.user_v10;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;

public class Resetpwd extends AppCompatActivity {
    private EditText mAccount;                        //用户名编辑
    private EditText mPwd_old;                        //密码编辑
    private EditText mPwd_new;                        //密码编辑
    private EditText mPwdCheck;                       //密码编辑
    private Button mSureButton;                       //确定按钮
    private Button mCancelButton;                     //取消按钮
    private UserDataManager mUserDataManager;         //用户数据管理类
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.resetpwd);
        mAccount = (EditText) findViewById(R.id.resetpwd_edit_name);
        mPwd_old = (EditText) findViewById(R.id.resetpwd_edit_pwd_old);
        mPwd_new = (EditText) findViewById(R.id.resetpwd_edit_pwd_new);
        mPwdCheck = (EditText) findViewById(R.id.resetpwd_edit_pwd_check);

        mSureButton = (Button) findViewById(R.id.resetpwd_btn_sure);
        mCancelButton = (Button) findViewById(R.id.resetpwd_btn_cancel);

        mSureButton.setOnClickListener(m_resetpwd_Listener);      //注册界面两个按钮的监听事件
        mCancelButton.setOnClickListener(m_resetpwd_Listener);
        if (mUserDataManager == null) {
            mUserDataManager = new UserDataManager(this);
            mUserDataManager.openDataBase();                              //建立本地数据库
        }
    }
    View.OnClickListener m_resetpwd_Listener = new View.OnClickListener() {    //不同按钮按下的监听事件选择
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.resetpwd_btn_sure:                       //确认按钮的监听事件
                    resetpwd_check();
                    break;
                case R.id.resetpwd_btn_cancel:                     //取消按钮的监听事件,由注册界面返回登录界面
                    Intent intent_Resetpwd_to_Login = new Intent(Resetpwd.this,Login.class) ;    //切换Resetpwd Activity至Login Activity
                    startActivity(intent_Resetpwd_to_Login);
                    finish();
                    break;
            }
        }
    };
    public void resetpwd_check() {                                //确认按钮的监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();
            String userPwd_old = mPwd_old.getText().toString().trim();
            String userPwd_new = mPwd_new.getText().toString().trim();
            String userPwdCheck = mPwdCheck.getText().toString().trim();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);
            if(result==1){                                             //返回1说明用户名和密码均正确,继续后续操作
                if(userPwd_new.equals(userPwdCheck)==false){           //两次密码输入不一样
                    Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
                    return ;
                } else {
                    UserData mUser = new UserData(userName, userPwd_new);
                    mUserDataManager.openDataBase();
                    boolean flag = mUserDataManager.updateUserData(mUser);
                    if (flag == false) {
                        Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();
                    }else{
                        Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();
                        mUser.pwdresetFlag=1;
                        Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ;    //切换User Activity至Login Activity
                        startActivity(intent_Register_to_Login);
                        finish();
                    }
                }
            }else if(result==0){                                       //返回0说明用户名和密码不匹配，重新输入
                Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
                return;
            }
        }
    }
    public boolean isUserNameAndPwdValid() {
        String userName = mAccount.getText().toString().trim();
        //检查用户是否存在
        int count=mUserDataManager.findUserByName(userName);
        //用户不存在时返回，给出提示文字
        if(count<=0){
            Toast.makeText(this, getString(R.string.name_not_exist, userName),Toast.LENGTH_SHORT).show();
            return false;
        }
        if (mAccount.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.account_empty),Toast.LENGTH_SHORT).show();
            return false;
        } else if (mPwd_old.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_empty),Toast.LENGTH_SHORT).show();
            return false;
        } else if (mPwd_new.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_new_empty),Toast.LENGTH_SHORT).show();
            return false;
        }else if(mPwdCheck.getText().toString().trim().equals("")) {
            Toast.makeText(this, getString(R.string.pwd_check_empty),Toast.LENGTH_SHORT).show();
            return false;
        }
        return true;
    }
}

User.java【用户个人中心】

[java] view plain copy
package com.example.foolishfan.user_v10;  
  
import android.content.Intent;  
import android.support.v7.app.AppCompatActivity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.Button;  
  
public class User extends AppCompatActivity {  
    private Button mReturnButton;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.user);  
        mReturnButton = (Button)findViewById(R.id.returnback);  
    }  
    public void back_to_login(View view) {  
        Intent intent3 = new Intent(User.this,Login.class) ;  
        startActivity(intent3);  
        finish();  
    }  
}  

package com.example.foolishfan.user_v10;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class User extends AppCompatActivity {
    private Button mReturnButton;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.user);
        mReturnButton = (Button)findViewById(R.id.returnback);
    }
    public void back_to_login(View view) {
        Intent intent3 = new Intent(User.this,Login.class) ;
        startActivity(intent3);
        finish();
    }
}

二、功能分析

   上面工程涉及到的这些内容，在网上有很多写的很有参考价值的资料，建议可单独熟悉各个部分内容，然后添加功能到已有代码基础上，由于好多天后才整理的博客，缺少很多刚学习时遇到的种种错误及其解决方法，细节之处还望多交流。

<1>：Button，TextView，TextEdit，ImageView，RatioButton等基本控件的使用
<2>：多个Activities之间的切换
<3>：使用Android本地数据库来管理用户信息

1：登录功能

   通过登录按钮的监听事件实现登录，登录过程中需要判断用户名是否存在，密码是否正确，核心函数：

public void login() {                        //登录按钮监听事件  
    if (isUserNameAndPwdValid()) {  
        String userName = mAccount.getText().toString().trim();//获取当前输入的用户名和密码信息  
        String userPwd = mPwd.getText().toString().trim();  
        SharedPreferences.Editor editor =login_sp.edit();  
        int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);  
        if(result==1){         //返回1说明用户名和密码均正确  
            //保存用户名和密码  
            editor.putString(”USER_NAME”, userName);  
            editor.putString(”PASSWORD”, userPwd);  
  
            //是否记住密码  
            if(mRememberCheck.isChecked()){  
                editor.putBoolean(”mRememberCheck”, true);  
            }else{  
                editor.putBoolean(”mRememberCheck”, false);  
            }  
            editor.commit();  
  
            Intent intent = new Intent(Login.this,User.class) ;  
            startActivity(intent);  
            finish();  
            Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示  
        }else if(result==0){  
            Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show();  //登录失败提示  
        }  
    }  
}  

 public void login() {                        //登录按钮监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();//获取当前输入的用户名和密码信息
            String userPwd = mPwd.getText().toString().trim();
            SharedPreferences.Editor editor =login_sp.edit();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
            if(result==1){         //返回1说明用户名和密码均正确
                //保存用户名和密码
                editor.putString("USER_NAME", userName);
                editor.putString("PASSWORD", userPwd);

                //是否记住密码
                if(mRememberCheck.isChecked()){
                    editor.putBoolean("mRememberCheck", true);
                }else{
                    editor.putBoolean("mRememberCheck", false);
                }
                editor.commit();

                Intent intent = new Intent(Login.this,User.class) ;
                startActivity(intent);
                finish();
                Toast.makeText(this, getString(R.string.login_success),Toast.LENGTH_SHORT).show();//登录成功提示
            }else if(result==0){
                Toast.makeText(this, getString(R.string.login_fail),Toast.LENGTH_SHORT).show();  //登录失败提示
            }
        }
    }

2：注册功能

   登录界面上点击注册按钮，进入对应监听事件，直接实现从Login的Activity到Register的Activity的跳转，然后在Register的Activity上实现用户注册，核心函数：

public void register_check() {                                //确认按钮的监听事件  
    if (isUserNameAndPwdValid()) {  
        String userName = mAccount.getText().toString().trim();  
        String userPwd = mPwd.getText().toString().trim();  
        String userPwdCheck = mPwdCheck.getText().toString().trim();  
        //检查用户是否存在  
       int count=mUserDataManager.findUserByName(userName);  
        //用户已经存在时返回，给出提示文字  
        if(count>0){  
            Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();  
            return ;  
        }  
        if(userPwd.equals(userPwdCheck)==false){     //两次密码输入不一样  
            Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();  
            return ;  
        } else {  
            UserData mUser = new UserData(userName, userPwd);  
            mUserDataManager.openDataBase();  
            long flag = mUserDataManager.insertUserData(mUser); //新建用户信息  
            if (flag == -1) {  
                Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();  
            }else{  
                Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();  
                Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;    
                startActivity(intent_Register_to_Login);  
                finish();  
            }  
        }  
    }  
}  

 public void register_check() {                                //确认按钮的监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();
            String userPwd = mPwd.getText().toString().trim();
            String userPwdCheck = mPwdCheck.getText().toString().trim();
            //检查用户是否存在
           int count=mUserDataManager.findUserByName(userName);
            //用户已经存在时返回，给出提示文字
            if(count>0){
                Toast.makeText(this, getString(R.string.name_already_exist, userName),Toast.LENGTH_SHORT).show();
                return ;
            }
            if(userPwd.equals(userPwdCheck)==false){     //两次密码输入不一样
                Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
                return ;
            } else {
                UserData mUser = new UserData(userName, userPwd);
                mUserDataManager.openDataBase();
                long flag = mUserDataManager.insertUserData(mUser); //新建用户信息
                if (flag == -1) {
                    Toast.makeText(this, getString(R.string.register_fail),Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(this, getString(R.string.register_success),Toast.LENGTH_SHORT).show();
                    Intent intent_Register_to_Login = new Intent(Register.this,Login.class) ;  
                    startActivity(intent_Register_to_Login);
                    finish();
                }
            }
        }
    }

3：修改密码功能

  在登录界面点击“修改密码”即可进入对应的Resetpwd的Activity，实现用户密码的修改，核心函数：

public void resetpwd_check() {                                //确认按钮的监听事件  
    if (isUserNameAndPwdValid()) {  
        String userName = mAccount.getText().toString().trim();  
        String userPwd_old = mPwd_old.getText().toString().trim();  
        String userPwd_new = mPwd_new.getText().toString().trim();  
        String userPwdCheck = mPwdCheck.getText().toString().trim();  
        int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);  
        if(result==1){                                             //返回1说明用户名和密码均正确,继续后续操作  
            if(userPwd_new.equals(userPwdCheck)==false){           //两次密码输入不一样  
                Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();  
                return ;  
            } else {  
                UserData mUser = new UserData(userName, userPwd_new);  
                mUserDataManager.openDataBase();  
                boolean flag = mUserDataManager.updateUserData(mUser);  
                if (flag == false) {  
                    Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();  
                }else{  
                    Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();  
                    mUser.pwdresetFlag=1;  
                    Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ;      
                    startActivity(intent_Register_to_Login);  
                    finish();  
                }  
            }  
        }else if(result==0){                                       //返回0说明用户名和密码不匹配，重新输入  
            Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();  
            return;  
        }  
    }  
}  

  public void resetpwd_check() {                                //确认按钮的监听事件
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();
            String userPwd_old = mPwd_old.getText().toString().trim();
            String userPwd_new = mPwd_new.getText().toString().trim();
            String userPwdCheck = mPwdCheck.getText().toString().trim();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd_old);
            if(result==1){                                             //返回1说明用户名和密码均正确,继续后续操作
                if(userPwd_new.equals(userPwdCheck)==false){           //两次密码输入不一样
                    Toast.makeText(this, getString(R.string.pwd_not_the_same),Toast.LENGTH_SHORT).show();
                    return ;
                } else {
                    UserData mUser = new UserData(userName, userPwd_new);
                    mUserDataManager.openDataBase();
                    boolean flag = mUserDataManager.updateUserData(mUser);
                    if (flag == false) {
                        Toast.makeText(this, getString(R.string.resetpwd_fail),Toast.LENGTH_SHORT).show();
                    }else{
                        Toast.makeText(this, getString(R.string.resetpwd_success),Toast.LENGTH_SHORT).show();
                        mUser.pwdresetFlag=1;
                        Intent intent_Register_to_Login = new Intent(Resetpwd.this,Login.class) ;    
                        startActivity(intent_Register_to_Login);
                        finish();
                    }
                }
            }else if(result==0){                                       //返回0说明用户名和密码不匹配，重新输入
                Toast.makeText(this, getString(R.string.pwd_not_fit_user),Toast.LENGTH_SHORT).show();
                return;
            }
        }
    }

4：注销功能

   注销功能直接在登录界面，当用户名和密码均正确时，点击注销按钮将直接注销用户【各位可根据需求将注销放在个人中心里面进行操作】。核心函数：

[java] view plain copy
public void cancel() {           //注销  
    if (isUserNameAndPwdValid()) {  
        String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息  
        String userPwd = mPwd.getText().toString().trim();  
        int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);  
        if(result==1){                                             //返回1说明用户名和密码均正确  
            Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//登录成功提示  
            mPwd.setText(”“);  
            mAccount.setText(”“);  
            mUserDataManager.deleteUserDatabyname(userName);  
        }else if(result==0){  
            Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show();  //登录失败提示  
        }  
    }  
  
}  

 public void cancel() {           //注销
        if (isUserNameAndPwdValid()) {
            String userName = mAccount.getText().toString().trim();    //获取当前输入的用户名和密码信息
            String userPwd = mPwd.getText().toString().trim();
            int result=mUserDataManager.findUserByNameAndPwd(userName, userPwd);
            if(result==1){                                             //返回1说明用户名和密码均正确
                Toast.makeText(this, getString(R.string.cancel_success),Toast.LENGTH_SHORT).show();//登录成功提示
                mPwd.setText("");
                mAccount.setText("");
                mUserDataManager.deleteUserDatabyname(userName);
            }else if(result==0){
                Toast.makeText(this, getString(R.string.cancel_fail),Toast.LENGTH_SHORT).show();  //登录失败提示
            }
        }

    }

5：记住密码

   当记住密码的RadioButton为真时，系统将记住此时用户登录的信息，用户在下次登录时可避免再次输入用户名和密码的麻烦，实现细节在Login的Activity中。

LoginActivity.java

package com.liu.activity;
 
import android.app.Activity;
import android.app.backup.SharedPreferencesBackupHelper;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.text.Spannable;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;
 
public class LoginActivity extends Activity {
	
	private EditText userName, password;
	private CheckBox rem_pw, auto_login;
	private Button btn_login;
	private ImageButton btnQuit;
    private String userNameValue,passwordValue;
	private SharedPreferences sp;
 
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		//去除标题
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.login);
		
        //获得实例对象
		sp = this.getSharedPreferences("userInfo", Context.MODE_WORLD_READABLE);
		userName = (EditText) findViewById(R.id.et_zh);
		password = (EditText) findViewById(R.id.et_mima);
        rem_pw = (CheckBox) findViewById(R.id.cb_mima);
		auto_login = (CheckBox) findViewById(R.id.cb_auto);
        btn_login = (Button) findViewById(R.id.btn_login);
        btnQuit = (ImageButton)findViewById(R.id.img_btn);
		
        
		//判断记住密码多选框的状态
      if(sp.getBoolean("ISCHECK", false))
        {
    	  //设置默认是记录密码状态
          rem_pw.setChecked(true);
       	  userName.setText(sp.getString("USER_NAME", ""));
       	  password.setText(sp.getString("PASSWORD", ""));
       	  //判断自动登陆多选框状态
       	  if(sp.getBoolean("AUTO_ISCHECK", false))
       	  {
       		     //设置默认是自动登录状态
       		     auto_login.setChecked(true);
       		    //跳转界面
				Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
				LoginActivity.this.startActivity(intent);
				
       	  }
        }
		
	    // 登录监听事件  现在默认为用户名为：liu 密码：123
		btn_login.setOnClickListener(new OnClickListener() {
 
			public void onClick(View v) {
				userNameValue = userName.getText().toString();
			    passwordValue = password.getText().toString();
			    
				if(userNameValue.equals("liu")&&passwordValue.equals("123"))
				{
					Toast.makeText(LoginActivity.this,"登录成功", Toast.LENGTH_SHORT).show();
					//登录成功和记住密码框为选中状态才保存用户信息
					if(rem_pw.isChecked())
					{
					 //记住用户名、密码、
					  Editor editor = sp.edit();
					  editor.putString("USER_NAME", userNameValue);
					  editor.putString("PASSWORD",passwordValue);
					  editor.commit();
					}
					//跳转界面
					Intent intent = new Intent(LoginActivity.this,LogoActivity.class);
					LoginActivity.this.startActivity(intent);
					//finish();
					
				}else{
					
					Toast.makeText(LoginActivity.this,"用户名或密码错误，请重新登录", Toast.LENGTH_LONG).show();
				}
				
			}
		});
 
	    //监听记住密码多选框按钮事件
		rem_pw.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
				if (rem_pw.isChecked()) {
                    
					System.out.println("记住密码已选中");
					sp.edit().putBoolean("ISCHECK", true).commit();
					
				}else {
					
					System.out.println("记住密码没有选中");
					sp.edit().putBoolean("ISCHECK", false).commit();
					
				}
 
			}
		});
		
		//监听自动登录多选框事件
		auto_login.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
				if (auto_login.isChecked()) {
					System.out.println("自动登录已选中");
					sp.edit().putBoolean("AUTO_ISCHECK", true).commit();
 
				} else {
					System.out.println("自动登录没有选中");
					sp.edit().putBoolean("AUTO_ISCHECK", false).commit();
				}
			}
		});
		
		btnQuit.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				finish();
			}
		});
 
	}
}

LogoActivity.java

package com.liu.activity;
 
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.opengl.ETC1;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;
 
public class LogoActivity extends Activity {
	private ProgressBar progressBar;
	private Button backButton;
 
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// 去除标题
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.logo);
 
		progressBar = (ProgressBar) findViewById(R.id.pgBar);
		backButton = (Button) findViewById(R.id.btn_back);
 
		Intent intent = new Intent(this, WelcomeAvtivity.class);
		LogoActivity.this.startActivity(intent);
 
		backButton.setOnClickListener(new OnClickListener() {
 
			@Override
			public void onClick(View v) {
				finish();
 
			}
		});
 
	}
 
}

本文地址：https://blog.csdn.net/z031022/article/details/107166198

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