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   源码介绍

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package com.example.clearedittext;

import android.content.Context;
import android.graphics.Rect;
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;

public class ClearEditText extends EditText implements  
        OnFocusChangeListener, TextWatcher { 
	
    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() { 
    	mClearDrawable = getCompoundDrawables()[2]; 
        if (mClearDrawable == null) { 
        	mClearDrawable = getResources().getDrawable(R.drawable.delete_selector); 
        } 
        
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 
        setClearIconVisible(false); 
        setOnFocusChangeListener(this); 
        addTextChangedListener(this); 
    } 
 
 
    /**
     * event.getX() 获取相对应自身左上角的X坐标
     * event.getY() 获取相对应自身左上角的Y坐标
     * getWidth() 获取控件的宽度
     * getTotalPaddingRight() 获取删除图标左边缘到控件右边缘的距离
     * getPaddingRight() 获取删除图标右边缘到控件右边缘的距离
     * getWidth() - getTotalPaddingRight() 计算删除图标左边缘到控件左边缘的距离
     * getWidth() - getPaddingRight() 计算删除图标右边缘到控件左边缘的距离
     */
    
    @Override 
	public boolean onTouchEvent(MotionEvent event) {
		if (event.getAction() == MotionEvent.ACTION_UP) {
			if (getCompoundDrawables()[2] != null) {
				//判断触摸点是否在水平范围内
				boolean isInnerWidth = event.getX() > (getWidth() - getTotalPaddingRight())
						&& (event.getX() < ((getWidth() - getPaddingRight())));
				
				 //获取删除图标的边界，返回一个Rect对象
	            Rect rect = getCompoundDrawables()[2].getBounds();
	            //获取删除图标的高度
	            int height = rect.height();
	            int y = (int) event.getY();
	            //计算图标底部到控件底部的距离
	            int distance = (getHeight() - height) /2;
	            //判断触摸点是否在竖直范围内(可能会有点误差)
	            //触摸点的纵坐标在distance到（distance 图标自身的高度）之内，则视为点中删除图标
	            boolean isInnerHeight = (y > distance) && (y < (distance   height));
	                                                                                        
	            if(isInnerWidth && isInnerHeight) {
					this.setText("");
				}
			}
		}

		return super.onTouchEvent(event);
	}
 
    
    @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) { 
         
    } 
    
   
    
    public void setShakeAnimation(){
    	this.setAnimation(shakeAnimation(5));
    }
    
    
   
    public static Animation shakeAnimation(int counts){
    	Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
    	translateAnimation.setInterpolator(new CycleInterpolator(counts));
    	translateAnimation.setDuration(1000);
    	return translateAnimation;
    }
 
 
}