content: package com.zhongou.widget;
  
  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.View.OnFocusChangeListener;
  import android.view.animation.Animation;
  import android.view.animation.CycleInterpolator;
  import android.view.animation.TranslateAnimation;
  import android.widget.EditText;
  
  import com.zhongou.R;
  
  public class SearchEditText extends EditText implements
          OnFocusChangeListener, TextWatcher { 
  	/**
  	 * 删除按钮的引用
  	 */
      private Drawable mClearDrawable; 
   
      public SearchEditText(Context context) {
      	this(context, null); 
      } 
   
      public SearchEditText(Context context, AttributeSet attrs) {
      	//这里构造方法也很重要，不加这个很多属性不能再XML里面定义
      	this(context, attrs, android.R.attr.editTextStyle); 
      } 
      
      public SearchEditText(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
          init();
      }
      
      
      private void init() { 
      	//获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
      	mClearDrawable = getCompoundDrawables()[2]; 
          if (mClearDrawable == null) { 
          	mClearDrawable = getResources() 
                      .getDrawable(R.mipmap.emotionstore_progresscancelbtn);
          } 
          mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 
          setClearIconVisible(false); 
          setOnFocusChangeListener(this); 
          addTextChangedListener(this); 
      } 
   
   
      /**
       * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
       * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
       * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑
       */
      @Override 
      public boolean onTouchEvent(MotionEvent event) { 
          if (getCompoundDrawables()[2] != null) { 
              if (event.getAction() == MotionEvent.ACTION_UP) { 
              	boolean touchable = event.getX() > (getWidth() 
                          - getPaddingRight() - mClearDrawable.getIntrinsicWidth()) 
                          && (event.getX() < ((getWidth() - getPaddingRight())));
                  if (touchable) { 
                      this.setText(""); 
                  } 
              } 
          } 
   
          return super.onTouchEvent(event); 
      } 
   
      /**
       * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
       */
      @Override 
      public void onFocusChange(View v, boolean hasFocus) { 
          if (hasFocus) { 
              setClearIconVisible(getText().length() > 0); 
          } else { 
              setClearIconVisible(false); 
          } 
      } 
   
   
      /**
       * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
       * @param visible
       */
      protected void setClearIconVisible(boolean visible) { 
          Drawable right = visible ? mClearDrawable : null; 
          setCompoundDrawables(getCompoundDrawables()[0], 
                  getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
      } 
       
      
      /**
       * 当输入框里面内容发生变化的时候回调的方法
       */
      @Override 
      public void onTextChanged(CharSequence s, int start, int count, 
              int after) { 
          setClearIconVisible(s.length() > 0); 
      } 
   
      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, 
              int after) { 
           
      } 
   
      @Override 
      public void afterTextChanged(Editable s) { 
           
      } 
      
     
      /**
       * 设置晃动动画
       */
      public void setShakeAnimation(){
      	this.setAnimation(shakeAnimation(5));
      }
      
      
      /**
       * 晃动动画
       * @param counts 1秒钟晃动多少下
       * @return
       */
      public static Animation shakeAnimation(int counts){
      	Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
      	translateAnimation.setInterpolator(new CycleInterpolator(counts));
      	translateAnimation.setDuration(1000);
      	return translateAnimation;
      }
   
   
  }
  