public class ClearEditText extends EditText implements View.OnFocusChangeListener,TextWatcher { 
 / 
  * 刪除按鈕的引用 
  */ 
 private Drawable mClearDrawable; 
 / 
  * 控件是否有焦點(diǎn) 
  */ 
 private boolean hasFoucs; 
 
 public ClearEditText(Context context) { 
  this(context, null); 
 } 
 public ClearEditText(Context context, AttributeSet attrs) { 
  // 這里構(gòu)造方法也很重要，不加這個(gè)很多屬性不能再XML里面定義 
  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(méi)有設(shè)置我們就使用默認(rèn)的圖片,2是獲得右邊的圖片 順序是左上右下（0,1,2,3,） 
  mClearDrawable = getCompoundDrawables()[2]; 
  if (mClearDrawable == null) { 
   // throw new 
   // NullPointerException("You can add drawableRight attribute in XML"); 
   mClearDrawable = getResources().getDrawable(R.drawable.icon_clear_input); 
  } 
 
  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(tīng) 
  setOnFocusChangeListener(this); 
  // 設(shè)置輸入框里面內(nèi)容發(fā)生改變的監(jiān)聽(tīng) 
  addTextChangedListener(this); 
 } 
 
 / 
  * 因?yàn)槲覀儾荒苤苯咏oEditText設(shè)置點(diǎn)擊事件，所以我們用記住我們按下的位置來(lái)模擬點(diǎn)擊事件 當(dāng)我們按下的位置 在 EditText的寬度 - 
  * 圖標(biāo)到控件右邊的間距 - 圖標(biāo)的寬度 和 EditText的寬度 - 圖標(biāo)到控件右邊的間距之間我們就算點(diǎn)擊了圖標(biāo)，豎直方向就沒(méi)有考慮 
  */ 
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
  if (event.getAction() == MotionEvent.ACTION_UP) { 
   if (getCompoundDrawables()[2] != null) { 
    boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())&& (event.getX() < ((getWidth() - getPaddingRight()))); 
    if (touchable) { 
     this.setText(""); 
    } 
   } 
  } 
  return super.onTouchEvent(event); 
 } 
 
 / 
  * 當(dāng)ClearEditText焦點(diǎn)發(fā)生變化的時(shí)候，判斷里面字符串長(zhǎng)度設(shè)置清除圖標(biāo)的顯示與隱藏 
  */ 
 @Override 
 public void onFocusChange(View v, boolean hasFocus) { 
  this.hasFoucs = hasFocus; 
  if (hasFocus) { 
   setClearIconVisible(getText().length() > 0); 
  } else { 
   setClearIconVisible(false); 
  } 
 } 
 
 / 
  * 設(shè)置清除圖標(biāo)的顯示與隱藏，調(diào)用setCompoundDrawables為EditText繪制上去 
  * 
  * @param visible 
  */ 
 protected void setClearIconVisible(boolean visible) { 
  Drawable right = visible ? mClearDrawable : null; 
  setCompoundDrawables(getCompoundDrawables()[0],getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
 } 
 
 / 
  * 當(dāng)輸入框里面內(nèi)容發(fā)生變化的時(shí)候回調(diào)的方法 
  */ 
 @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) { 
 
 } 
 
 / 
  * 設(shè)置晃動(dòng)動(dòng)畫(huà) 
  */ 
 public void setShakeAnimation() { 
  this.startAnimation(shakeAnimation(5)); 
 } 
 
 / 
  * 晃動(dòng)動(dòng)畫(huà) 
  * 
  * @param counts 
  *   1秒鐘晃動(dòng)多少下 
  * @return 
  */ 
 public static Animation shakeAnimation(int counts) { 
  Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0); 
  //設(shè)置一個(gè)循環(huán)加速器，使用傳入的次數(shù)就會(huì)出現(xiàn)擺動(dòng)的效果。 
  translateAnimation.setInterpolator(new CycleInterpolator(counts)); 
  translateAnimation.setDuration(500); 
  return translateAnimation; 
 } 
 
} 

<com.example.clearedittext.ClearEditText  
    android:id="@+id/username"  
    android:layout_marginTop="60dp"  
    android:layout_width="fill_parent"  
    android:background="@drawable/login_edittext_bg"   
    android:drawableLeft="@drawable/icon_user"  
    android:layout_marginLeft="10dip"  
    android:layout_marginRight="10dip"  
    android:singleLine="true"  
    android:drawableRight="@drawable/delete_selector"  
    android:hint="輸入用戶名"  
    android:layout_height="wrap_content" />