Android 帶有刪除按鈕的EditText

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: 
 * 自定義控件實現帶清除功能的EditText 
 * 
 * 學習資料: 
 * 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, "請輸入用戶名", Toast.LENGTH_SHORT).show(); 
      } 
 
      if (TextUtils.isEmpty(mPassWordCleanableEditText.getText())) { 
        mPassWordCleanableEditText.setShakeAnimation(); 
        Toast.makeText(MainActivity.this, "請輸入密碼", 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; 
/** 
 * 在焦點變化時和輸入內容發生變化時均要判斷是否顯示右邊clean圖標 
 */ 
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 
    //即我們在布局文件中設置的android:drawableRight 
    mRightDrawable=drawables[2];   
     
    //設置焦點變化的監聽 
    this.setOnFocusChangeListener(new FocusChangeListenerImpl()); 
    //設置EditText文字變化的監聽 
    this.addTextChangedListener(new TextWatcherImpl()); 
    //初始化時讓右邊clean圖標不可見 
    setClearDrawableVisible(false); 
  } 
   
   
  /** 
   * 當手指抬起的位置在clean的圖標的區域 
   * 我們將此視為進行清除操作 
   * getWidth():得到控件的寬度 
   * event.getX():抬起時的坐標(改坐標是相對於控件本身而言的) 
   * getTotalPaddingRight():clean的圖標左邊緣至控件右邊緣的距離 
   * getPaddingRight():clean的圖標右邊緣至控件右邊緣的距離 
   * 於是: 
   * getWidth() - getTotalPaddingRight()表示: 
   * 控件左邊到clean的圖標左邊緣的區域 
   * getWidth() - getPaddingRight()表示: 
   * 控件左邊到clean的圖標右邊緣的區域 
   * 所以這兩者之間的區域剛好是clean的圖標的區域 
   */ 
  @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); 
      } 
    } 
     
  } 
   
  //當輸入結束後判斷是否顯示右邊clean的圖標 
  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) { 
       
    } 
     
  }   
   
  //隱藏或者顯示右邊clean的圖標 
  protected void setClearDrawableVisible(boolean isVisible) { 
    Drawable rightDrawable; 
    if (isVisible) { 
      rightDrawable = mRightDrawable; 
    } else { 
      rightDrawable = null; 
    } 
    //使用代碼設置該控件left, top, right, and bottom處的圖標 
    setCompoundDrawables(getCompoundDrawables()[0],getCompoundDrawables()[1],  
               rightDrawable,getCompoundDrawables()[3]); 
  }  
 
  // 顯示一個動畫,以提示用戶輸入 
  public void setShakeAnimation() { 
    this.setAnimation(shakeAnimation(5)); 
  } 
 
  //CycleTimes動畫重復的次數 
  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> 

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