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Android 带有删除按钮的EditText

2019年07月24日  | 移动技术网IT编程  | 我要评论

mainactivity如下:

package cc.textview5; 
import android.os.bundle; 
import android.text.textutils; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.widget.button; 
import android.widget.toast; 
import android.app.activity; 
/** 
 * demo描述: 
 * 自定义控件实现带清除功能的edittext 
 * 
 * 学习资料: 
 * http://blog.csdn.net/xiaanming/article/details/11066685 
 * 
 * thank you very much 
 */ 
public class mainactivity extends activity { 
  private cleanableedittext musernamecleanableedittext; 
  private cleanableedittext mpasswordcleanableedittext; 
  private button mloginbutton; 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.main); 
    init(); 
  } 
   
  private void init(){ 
    musernamecleanableedittext=(cleanableedittext) findviewbyid(r.id.usernameedittext); 
    mpasswordcleanableedittext=(cleanableedittext) findviewbyid(r.id.passwordedittext); 
    mloginbutton=(button) findviewbyid(r.id.loginbutton); 
    mloginbutton.setonclicklistener(new onclicklistenerimpl()); 
  } 
   
  private class onclicklistenerimpl implements onclicklistener { 
    @override 
    public void onclick(view view) { 
      if (textutils.isempty(musernamecleanableedittext.gettext())) { 
        musernamecleanableedittext.setshakeanimation(); 
        toast.maketext(mainactivity.this, "请输入用户名", toast.length_short).show(); 
      } 
 
      if (textutils.isempty(mpasswordcleanableedittext.gettext())) { 
        mpasswordcleanableedittext.setshakeanimation(); 
        toast.maketext(mainactivity.this, "请输入密码", toast.length_short).show(); 
      } 
    } 
 
  } 
   
 
}

cleanableedittext如下:

package cc.textview5; 
 
import android.content.context; 
import android.graphics.drawable.drawable; 
import android.text.editable; 
import android.text.textwatcher; 
import android.util.attributeset; 
import android.view.motionevent; 
import android.view.view; 
import android.view.animation.animation; 
import android.view.animation.cycleinterpolator; 
import android.view.animation.translateanimation; 
import android.widget.edittext; 
/** 
 * 在焦点变化时和输入内容发生变化时均要判断是否显示右边clean图标 
 */ 
public class cleanableedittext extends edittext { 
  private drawable mrightdrawable; 
  private boolean ishasfocus; 
   
  public cleanableedittext(context context) { 
    super(context); 
    init(); 
  } 
  public cleanableedittext(context context, attributeset attrs) { 
    super(context, attrs); 
    init(); 
  } 
 
  public cleanableedittext(context context, attributeset attrs, int defstyle) { 
    super(context, attrs, defstyle); 
    init(); 
  } 
   
  private void init(){ 
    //getcompounddrawables: 
    //returns drawables for the left, top, right, and bottom borders. 
    drawable [] drawables=this.getcompounddrawables(); 
     
    //取得right位置的drawable 
    //即我们在布局文件中设置的android:drawableright 
    mrightdrawable=drawables[2];   
     
    //设置焦点变化的监听 
    this.setonfocuschangelistener(new focuschangelistenerimpl()); 
    //设置edittext文字变化的监听 
    this.addtextchangedlistener(new textwatcherimpl()); 
    //初始化时让右边clean图标不可见 
    setcleardrawablevisible(false); 
  } 
   
   
  /** 
   * 当手指抬起的位置在clean的图标的区域 
   * 我们将此视为进行清除操作 
   * getwidth():得到控件的宽度 
   * event.getx():抬起时的坐标(改坐标是相对于控件本身而言的) 
   * gettotalpaddingright():clean的图标左边缘至控件右边缘的距离 
   * getpaddingright():clean的图标右边缘至控件右边缘的距离 
   * 于是: 
   * getwidth() - gettotalpaddingright()表示: 
   * 控件左边到clean的图标左边缘的区域 
   * getwidth() - getpaddingright()表示: 
   * 控件左边到clean的图标右边缘的区域 
   * 所以这两者之间的区域刚好是clean的图标的区域 
   */ 
  @override 
  public boolean ontouchevent(motionevent event) { 
    switch (event.getaction()) { 
    case motionevent.action_up: 
       
      boolean isclean =(event.getx() > (getwidth() - gettotalpaddingright()))&& 
               (event.getx() < (getwidth() - getpaddingright())); 
      if (isclean) { 
        settext(""); 
      } 
      break; 
 
    default: 
      break; 
    } 
    return super.ontouchevent(event); 
  } 
   
  private class focuschangelistenerimpl implements onfocuschangelistener{ 
    @override 
    public void onfocuschange(view v, boolean hasfocus) { 
       ishasfocus=hasfocus; 
       if (ishasfocus) { 
         boolean isvisible=gettext().tostring().length()>=1; 
         setcleardrawablevisible(isvisible); 
      } else { 
         setcleardrawablevisible(false); 
      } 
    } 
     
  } 
   
  //当输入结束后判断是否显示右边clean的图标 
  private class textwatcherimpl implements textwatcher{ 
    @override 
    public void aftertextchanged(editable s) { 
       boolean isvisible=gettext().tostring().length()>=1; 
       setcleardrawablevisible(isvisible); 
    } 
 
    @override 
    public void beforetextchanged(charsequence s, int start, int count,int after) { 
       
    } 
 
    @override 
    public void ontextchanged(charsequence s, int start, int before,int count) { 
       
    } 
     
  }   
   
  //隐藏或者显示右边clean的图标 
  protected void setcleardrawablevisible(boolean isvisible) { 
    drawable rightdrawable; 
    if (isvisible) { 
      rightdrawable = mrightdrawable; 
    } else { 
      rightdrawable = null; 
    } 
    //使用代码设置该控件left, top, right, and bottom处的图标 
    setcompounddrawables(getcompounddrawables()[0],getcompounddrawables()[1],  
               rightdrawable,getcompounddrawables()[3]); 
  }  
 
  // 显示一个动画,以提示用户输入 
  public void setshakeanimation() { 
    this.setanimation(shakeanimation(5)); 
  } 
 
  //cycletimes动画重复的次数 
  public animation shakeanimation(int cycletimes) { 
    animation translateanimation = new translateanimation(0, 10, 0, 10); 
    translateanimation.setinterpolator(new cycleinterpolator(cycletimes)); 
    translateanimation.setduration(1000); 
    return translateanimation; 
  } 
 
}

main.xml如下:

<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:paddingleft="20dip" 
  android:paddingright="20dip" 
  > 
 
  <cc.textview5.cleanableedittext 
    android:id="@+id/usernameedittext" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:hint="username" 
    android:layout_margintop="30dip" 
    android:drawableleft="@drawable/icon_user" 
    android:drawableright="@drawable/clean_selector" 
     /> 
   
   <cc.textview5.cleanableedittext 
    android:id="@+id/passwordedittext" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:hint="password" 
    android:password="true" 
    android:layout_margintop="100dip" 
    android:drawableleft="@drawable/account_icon" 
    android:drawableright="@drawable/clean_selector" 
     /> 
    
   <button 
     android:id="@+id/loginbutton" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="login" 
    android:layout_margintop="155dip" 
     /> 
 
</relativelayout>

以上就是对android   带有删除按钮的edittext的资料整理，后续继续补充相关资料，谢谢大家对本站的支持！

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