有趣的EditView为空时的抖动效果（用户名和密码）--第三方开源--ClearEditText

ClearEditText在github上的链接地址是：https://github.com/zhangphil/ClearEditText

用法十分简单，在布局中使用ClearEditText，在JAVA中setShakeAnimation()即可。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#95CAE4">


    <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="输入用户名"
        android:layout_height="wrap_content" >

    </com.example.clearedittext.ClearEditText>

    <com.example.clearedittext.ClearEditText
        android:id="@+id/password"
        android:layout_marginLeft="10dip"
        android:layout_marginRight="10dip"
        android:layout_marginTop="10dip"
        android:drawableLeft="@drawable/account_icon"
        android:hint="输入密码"
        android:singleLine="true"
        android:password="true"
        android:drawableRight="@drawable/delete_selector"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/username"
        android:background="@drawable/login_edittext_bg" >
    </com.example.clearedittext.ClearEditText>

    <Button
        android:id="@+id/login"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dip"
        android:layout_marginRight="10dip"
        android:background="@drawable/login_button_bg"
        android:textSize="18sp"
        android:textColor="@android:color/white"
        android:layout_below="@+id/password"
        android:layout_marginTop="25dp"
        android:text="登录" />

</RelativeLayout>

package com.example.clearedittext;

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;

public class ClearEditText extends EditText implements  
        OnFocusChangeListener, TextWatcher { 
    /**
     * 删除按钮的引用
     */
    private Drawable mClearDrawable; 
    /**
     * 控件是否有焦点
     */
    private boolean hasFoucs;
 
    public ClearEditText(Context context) { 
        this(context, null); 
    } 
 
    public ClearEditText(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 ClearEditText(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,右边位置图片
        mClearDrawable = getCompoundDrawables()[2]; 
        if (mClearDrawable == null) { 
//            throw new NullPointerException("You can add drawableRight attribute in XML");
            mClearDrawable = getResources().getDrawable(R.drawable.delete_selector); 
        } 
        
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 
        //默认设置隐藏图标
        setClearIconVisible(false); 
        //设置焦点改变的监听
        setOnFocusChangeListener(this); 
        //设置输入框里面内容发生改变的监听
        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，竖直方向就没有考虑
     */
    @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);
    }
 
    /**
     * 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) { 
        this.hasFoucs = 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) { 
                if(hasFoucs){
                    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;
    }
 
 
}