可清空文本的EditText

代码如下：

 public class DeleteEditText extends EditText {

     private Context mContext;

     //删除图标
     private Drawable drawableDelete;

     public DeleteEditText(Context context) {
         super(context);
         mContext = context;
         init();
     }

     public DeleteEditText(Context context, AttributeSet attrs) {
         super(context, attrs);
         mContext = context;
         init();
     }

     public DeleteEditText(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         mContext = context;
         init();
     }

     private void init() {
         drawableDelete = mContext.getResources().getDrawable(R.drawable.ic_inputbox_clear);
         drawableDelete.setBounds(0, 0, drawableDelete.getIntrinsicWidth(), drawableDelete.getIntrinsicHeight());
         addTextChangedListener(new TextWatcher() {
             @Override
             public void beforeTextChanged(CharSequence s, int start, int count, int after) {

             }

             @Override
             public void onTextChanged(CharSequence s, int start, int before, int count) {

             }

             @Override
             public void afterTextChanged(Editable s) {
                 setIcon(length() > 0);
             }
         });
         setIcon(false);
     }

     @Override
     public boolean onTouchEvent(MotionEvent event) {
         if (drawableDelete != null && event.getAction() == MotionEvent.ACTION_UP) {
             //获取触摸点坐标
             int eventX = (int) event.getRawX();
             int eventY = (int) event.getRawY();
             //获取整个EdtiText的可见区域
             Rect rect = new Rect();
             getGlobalVisibleRect(rect);
             //修改区域为图标区域
             rect.left = rect.right - 80;
             if (rect.contains(eventX, eventY)) {
                 //触摸点在图标区域，清空文本
                 setText("");
             }
         }
         return super.onTouchEvent(event);
     }

     //根据是否有内容来绘制图标
     private void setIcon(boolean visible) {
         Drawable right = visible ? drawableDelete : null;
         setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
     }
 }