/** 
 * @說(shuō)明： 自定義帶刪除按鈕的EditText 
 * 
 */ 
public class ClearEditText extends EditText implements OnFocusChangeListener, 
    TextWatcher { 
  //EditText右側(cè)的刪除按鈕 
  private Drawable mClearDrawable; 
  private boolean hasFoucs; 
 
  public ClearEditText(Context context) { 
    this(context, null); 
  } 
 
  public ClearEditText(Context context, AttributeSet attrs) { 
    this(context, attrs, android.R.attr.editTextStyle); 
  } 
 
  public ClearEditText(Context context, AttributeSet attrs, int defStyle) { 
    super(context, attrs, defStyle); 
    init(); 
  } 
 
  private void init() { 
    // 獲取EditText的DrawableRight,假如沒有設(shè)置我們就使用默認(rèn)的圖片,獲取圖片的順序是左上右下（0,1,2,3,） 
    mClearDrawable = getCompoundDrawables()[2]; 
    if (mClearDrawable == null) { 
      mClearDrawable = getResources().getDrawable( 
          R.drawable.edit_delete); 
    } 
 
    mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), 
        mClearDrawable.getIntrinsicHeight()); 
    // 默認(rèn)設(shè)置隱藏圖標(biāo) 
    setClearIconVisible(false); 
    // 設(shè)置焦點(diǎn)改變的監(jiān)聽 
    setOnFocusChangeListener(this); 
    // 設(shè)置輸入框里面內(nèi)容發(fā)生改變的監(jiān)聽 
    addTextChangedListener(this); 
  } 
     
  /* @說(shuō)明：isInnerWidth, isInnerHeight為ture，觸摸點(diǎn)在刪除圖標(biāo)之內(nèi)，則視為點(diǎn)擊了刪除圖標(biāo) 
   * event.getX() 獲取相對(duì)應(yīng)自身左上角的X坐標(biāo) 
   * event.getY() 獲取相對(duì)應(yīng)自身左上角的Y坐標(biāo) 
   * getWidth() 獲取控件的寬度 
   * getHeight() 獲取控件的高度 
   * getTotalPaddingRight() 獲取刪除圖標(biāo)左邊緣到控件右邊緣的距離 
   * getPaddingRight() 獲取刪除圖標(biāo)右邊緣到控件右邊緣的距離 
   * isInnerWidth: 
   * getWidth() - getTotalPaddingRight() 計(jì)算刪除圖標(biāo)左邊緣到控件左邊緣的距離 
   * getWidth() - getPaddingRight() 計(jì)算刪除圖標(biāo)右邊緣到控件左邊緣的距離 
   * isInnerHeight: 
   * distance 刪除圖標(biāo)頂部邊緣到控件頂部邊緣的距離 
   * distance + height 刪除圖標(biāo)底部邊緣到控件頂部邊緣的距離 
   */ 
  @Override 
  public boolean onTouchEvent(MotionEvent event) { 
    if (event.getAction() == MotionEvent.ACTION_UP) { 
      if (getCompoundDrawables()[2] != null) { 
        int x = (int)event.getX(); 
        int y = (int)event.getY(); 
        Rect rect = getCompoundDrawables()[2].getBounds(); 
        int height = rect.height(); 
        int distance = (getHeight() - height)/2; 
        boolean isInnerWidth = x > (getWidth() - getTotalPaddingRight()) && x < (getWidth() - getPaddingRight()); 
        boolean isInnerHeight = y > distance && y <(distance + height); 
        if (isInnerWidth && isInnerHeight) { 
          this.setText(""); 
        } 
      } 
    } 
    return super.onTouchEvent(event); 
  } 
 
  /** 
   * 當(dāng)ClearEditText焦點(diǎn)發(fā)生變化的時(shí)候， 
   * 輸入長(zhǎng)度為零，隱藏刪除圖標(biāo)，否則，顯示刪除圖標(biāo) 
   */ 
  @Override 
  public void onFocusChange(View v, boolean hasFocus) { 
    this.hasFoucs = hasFocus; 
    if (hasFocus) { 
      setClearIconVisible(getText().length() > 0); 
    } else { 
      setClearIconVisible(false); 
    } 
  } 
 
  protected void setClearIconVisible(boolean visible) { 
    Drawable right = visible ? mClearDrawable : null; 
    setCompoundDrawables(getCompoundDrawables()[0], 
        getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
  } 
 
  @Override 
  public void onTextChanged(CharSequence s, int start, int count, int after) { 
    if (hasFoucs) { 
      setClearIconVisible(s.length() > 0); 
    } 
  } 
 
  @Override 
  public void beforeTextChanged(CharSequence s, int start, int count, 
      int after) { 
 
  } 
 
  @Override 
  public void afterTextChanged(Editable s) { 
 
  } 
   
 
} 

<com.once.android_ui.selfview.ClearEditText 
    android:id="@+id/user_name" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:drawableLeft="@drawable/user_name" 
    android:drawablePadding="7dp" 
    android:hint="@string/name_tip" 
    android:singleLine="true" 
    android:textSize="17sp" > 
    <requestFocus /> 
  </com.once.android_ui.selfview.ClearEditText>