Android实现登陆页logo随键盘收放动态伸缩（完美解决键盘弹出遮挡控件的问题）

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout 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:background="@color/white" 
 tools:context=".login.loginactivity" 
 android:orientation="vertical" 
 android:id="@+id/ll_login_root"> 
 <linearlayout 
  android:orientation="vertical" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:layout_margintop="90dp" 
  android:id="@+id/ll_login_logobg" 
  android:layout_marginbottom="50dp"> 
  <imageview 
   android:layout_width="160dp" 
   android:layout_height="160dp" 
   android:id="@+id/iv_login_logo" 
   android:background="@mipmap/login_logo" 
   android:layout_gravity="center_horizontal" /> 
 </linearlayout> 
 <linearlayout 
  android:orientation="vertical" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:layout_marginleft="50dp" 
  android:layout_marginright="50dp"> 
  <linearlayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="50dp"> 
   <imageview 
    android:layout_width="45dp" 
    android:layout_height="45dp" 
    android:background="@mipmap/login_phone" 
    android:id="@+id/imageview2" 
    android:layout_gravity="bottom" /> 
   <edittext 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:inputtype="phone" 
    android:ems="10" 
    android:id="@+id/et_login_phone" 
    android:layout_gravity="center" 
    android:hint="请输入手机号" 
    android:background="@null" 
    android:maxlength="11"/> 
  </linearlayout> 
  <linearlayout 
   android:orientation="vertical" 
   android:layout_width="match_parent" 
   android:layout_height="1dp" 
   android:background="@color/text_gray"></linearlayout> 
  <linearlayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="50dp" > 
   <imageview 
    android:layout_width="45dp" 
    android:layout_height="45dp" 
    android:background="@mipmap/login_password" 
    android:id="@+id/imageview3" 
    android:layout_gravity="bottom" /> 
   <edittext 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputtype="phone" 
    android:ems="10" 
    android:id="@+id/et_login_code" 
    android:layout_gravity="center" 
    android:layout_weight="1" 
    android:hint="请输入验证码" 
    android:background="@null" 
    android:maxlength="6"/> 
   <button 
    android:layout_width="90dp" 
    android:layout_height="30dp" 
    android:text="获取验证码" 
    android:textcolor="@color/white" 
    android:id="@+id/bt_login_getcode" 
    android:background="@mipmap/login_button_blue" 
    android:layout_gravity="center_vertical" 
    android:textsize="14dp" /> 
  </linearlayout> 
  <linearlayout 
   android:orientation="vertical" 
   android:layout_width="match_parent" 
   android:layout_height="1dp" 
   android:background="@color/text_gray" 
   android:layout_marginbottom="10dp" /> 
  <linearlayout 
   android:orientation="horizontal" 
   android:layout_width="match_parent" 
   android:layout_height="20dp" 
   android:id="@+id/ll_login_warning" 
   android:visibility="gone"> 
   <imageview 
    android:layout_width="25dp" 
    android:layout_height="25dp" 
    android:background="@mipmap/login_warning" 
    android:id="@+id/imageview" 
    android:layout_gravity="center_vertical" /> 
   <textview 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:textappearance="?android:attr/textappearancemedium" 
    android:text="请输入验证码" 
    android:id="@+id/tv_login_wraning" 
    android:layout_gravity="center_vertical" 
    android:textcolor="@color/text_red" 
    android:textsize="13dp" /> 
  </linearlayout> 
  <button 
   android:layout_width="match_parent" 
   android:layout_height="40dp" 
   android:textcolor="@color/white" 
   android:id="@+id/bt_login_submit" 
   android:background="@mipmap/login_button_gray" 
   android:text="登 录" 
   android:textsize="18dp" 
   android:layout_margintop="10dp" /> 
 </linearlayout> 
</linearlayout>

package com.millionideas.cm.login; 
import android.app.progressdialog; 
import android.content.intent; 
import android.os.bundle; 
import android.os.handler; 
import android.text.editable; 
import android.text.textwatcher; 
import android.view.view; 
import android.view.viewgroup; 
import android.widget.button; 
import android.widget.edittext; 
import android.widget.imageview; 
import android.widget.linearlayout; 
import android.widget.textview; 
import com.millionideas.cm.r; 
import com.millionideas.cm.home.homeactivity; 
import com.millionideas.cm.main.baseactivity; 
import com.millionideas.cm.tools.timecountutils; 
import org.xutils.view.annotation.contentview; 
import org.xutils.view.annotation.event; 
import org.xutils.view.annotation.viewinject; 
import java.util.regex.matcher; 
import java.util.regex.pattern; 
@contentview(r.layout.activity_login) 
public class loginactivity extends baseactivity implements view.onlayoutchangelistener{ 
//用xutils进行控件绑定 
 @viewinject(r.id.iv_login_logo) 
 imageview iv_login_logo; 
 @viewinject(r.id.ll_login_logobg) 
 linearlayout ll_login_logobg; 
 @viewinject(r.id.et_login_phone) 
 edittext et_login_phone; 
 @viewinject(r.id.et_login_code) 
 edittext et_login_code; 
 @viewinject(r.id.ll_login_warning) 
 linearlayout ll_login_warning; 
 @viewinject(r.id.tv_login_wraning) 
 textview tv_login_wraning; 
 @viewinject(r.id.bt_login_getcode) 
 button bt_login_getcode; 
 @viewinject(r.id.bt_login_submit) 
 button bt_login_submit; 
 @viewinject(r.id.ll_login_root) 
 linearlayout activityrootview;//需要操作的布局 
 private timecountutils timecountutils; 
 private matcher phone_num; 
 private pattern phonenumber; 
 private progressdialog progressdialog; 
 private handler handler; 
 private int screenheight = 0;//屏幕高度 
 private int keyheight = 0; //软件盘弹起后所占高度 
 @override 
 protected void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  screenheight = this.getwindowmanager().getdefaultdisplay().getheight(); //获取屏幕高度 
  keyheight = screenheight / 3;//弹起高度为屏幕高度的1/3 
  timecountutils = new timecountutils(loginactivity.this, 60000, 1000, bt_login_getcode);//时间工具类用以实现倒计时 
  progressdialog=new progressdialog(this);//对话框 
  handler=new handler(); 
  bt_login_submit.setclickable(false); 
  et_login_phone.addtextchangedlistener(new textwatcher() {//为edittext添加文本改变监听，根据是否有文本输入更改确认按钮的背景颜色 
   @override 
   public void beforetextchanged(charsequence charsequence, int i, int i1, int i2) { 
   } 
   @override 
   public void ontextchanged(charsequence charsequence, int i, int i1, int i2) { 
   } 
   @override 
   public void aftertextchanged(editable editable) { 
    if (!et_login_phone.gettext().tostring().equals("")){ 
     bt_login_submit.setclickable(true); 
     bt_login_submit.setbackgroundresource(r.drawable.login_button); 
    }else { 
     bt_login_submit.setclickable(false); 
     bt_login_submit.setbackgroundresource(r.mipmap.login_button_gray); 
    } 
   } 
  }); 
 } 
 //xutils的事件处理 
 @event(value = {r.id.bt_login_submit, r.id.bt_login_getcode}, type = view.onclicklistener.class) 
 private void onclick(view view) { 
  switch (view.getid()) { 
   case r.id.bt_login_submit://确认按钮事件 
    if (!checkphone(et_login_phone).matches()) {//判断手机号格式 
     ll_login_warning.setvisibility(view.visible); 
     tv_login_wraning.settext("手机号码格式不正确"); 
    } else if (!et_login_code.gettext().tostring().equals("000")) {//验证码判断，为方便测试设置了默认值 
     ll_login_warning.setvisibility(view.visible); 
     tv_login_wraning.settext("验证码不正确"); 
    } else {//条件全部满足，开始登陆 
     ll_login_warning.setvisibility(view.gone); 
     progressdialog.setmessage("正在登录…"); 
     progressdialog.show();//弹出加载对话框 
     handler.postdelayed(new runnable() {//设置一个1s的延时操作模拟登陆的过程 
      @override 
      public void run() {//登陆成功关掉对话框，跳转页面，关掉本页 
       progressdialog.dismiss();//不能用hide 
       intent intent=new intent(loginactivity.this, homeactivity.class); 
       startactivity(intent); 
       loginactivity.this.finish(); 
      } 
     },1000); 
    } 
    break; 
   case r.id.bt_login_getcode: 
    if (checkphone(et_login_phone).matches()) {//手机号正确则获取验证码，开启倒计时 
     ll_login_warning.setvisibility(view.gone); 
     bt_login_getcode.setbackgroundresource(r.mipmap.login_button_gray); 
     timecountutils.start(); 
    } else { 
     ll_login_warning.setvisibility(view.visible); 
     tv_login_wraning.settext("手机号码格式不正确"); 
    } 
    break; 
  } 
 } 
 public matcher checkphone(edittext edittext) {//判断手机号格式 
  phonenumber = pattern 
    .compile("^[1][3-8][0-9]{9}$"); 
  phone_num = phonenumber.matcher(edittext.gettext() 
    .tostring()); 
  return phone_num; 
 } 
 @override 
 protected void onresume() { 
  super.onresume(); 
  activityrootview.addonlayoutchangelistener(this);//给需要操作的布局设置监听 
 } 
 @override 
 public void onlayoutchange(view v, int left, int top, int right, 
        int bottom, int oldleft, int oldtop, int oldright, int oldbottom) { 
  /* old是改变前的左上右下坐标点值，没有old的是改变后的左上右下坐标点值 
  现在认为只要控件将activity向上推的高度超过了1/3屏幕高，就认为软键盘弹起*/ 
  if (oldbottom != 0 && bottom != 0 && (oldbottom - bottom > keyheight)) { 
   viewgroup.layoutparams params = iv_login_logo.getlayoutparams();//获取布局，设置键盘弹起后logo的宽高 
   params.height = 300; 
   params.width = 300; 
   iv_login_logo.setlayoutparams(params); 
   linearlayout.layoutparams lp = new linearlayout.layoutparams(ll_login_logobg.getlayoutparams()); 
   lp.setmargins(0, 90, 0, 50);//设置包含logo的布局的位置 
   ll_login_logobg.setlayoutparams(lp); 
  } else if (oldbottom != 0 && bottom != 0 && (bottom - oldbottom > keyheight)) {//键盘收回后，logo恢复原来大小，位置同样回到初始位置 
   viewgroup.layoutparams params = iv_login_logo.getlayoutparams(); 
   params.height = 480; 
   params.width = 480; 
   iv_login_logo.setlayoutparams(params); 
   linearlayout.layoutparams lp = new linearlayout.layoutparams(ll_login_logobg.getlayoutparams()); 
   lp.setmargins(0, 270, 0, 150); 
   ll_login_logobg.setlayoutparams(lp); 
  } 
 } 
}