Android ClearEditText：输入用户名、密码错误时整体删除及输入为空时候晃动提示

package com.lixu.clearedittext;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
private Toast mToast;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final ClearEditText username = (ClearEditText) findViewById(R.id.username);
final ClearEditText password = (ClearEditText) findViewById(R.id.password);

((Button) findViewById(R.id.login)).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if(TextUtils.isEmpty(username.getText())){
//设置晃动
username.setShakeAnimation();
//设置提示
showToast("用户名不能为空");
return;
}

if(TextUtils.isEmpty(password.getText())){
password.setShakeAnimation();
showToast("密码不能为空");
return;
}
}
});
}

/**
* 显示Toast消息
* @param msg
*/
private void showToast(String msg){
if(mToast == null){
mToast = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
}else{
mToast.setText(msg);
}
mToast.show();
}

}

package com.lixu.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;
}

}

1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2     xmlns:tools="http://schemas.android.com/tools"
3     android:layout_width="match_parent"
4     android:layout_height="match_parent"
5     android:background="#95CAE4">
6
7
8     <com.lixu.clearedittext.ClearEditText
9         android:id="@+id/username"
10         android:layout_marginTop="60dp"
11         android:layout_width="fill_parent"
12         android:background="@drawable/login_edittext_bg"
13         android:drawableLeft="@drawable/icon_user"
14         android:layout_marginLeft="10dip"
15         android:layout_marginRight="10dip"
16         android:singleLine="true"
17         android:drawableRight="@drawable/delete_selector"
18         android:hint="输入用户名"
19         android:layout_height="wrap_content" >
20
21     </com.lixu.clearedittext.ClearEditText>
22
23     <com.lixu.clearedittext.ClearEditText
24         android:id="@+id/password"
25         android:layout_marginLeft="10dip"
26         android:layout_marginRight="10dip"
27         android:layout_marginTop="10dip"
28         android:drawableLeft="@drawable/account_icon"
29         android:hint="输入密码"
30         android:singleLine="true"
31         android:password="true"
32         android:drawableRight="@drawable/delete_selector"
33         android:layout_width="fill_parent"
34         android:layout_height="wrap_content"
35         android:layout_below="@id/username"
36         android:background="@drawable/login_edittext_bg" >
37     </com.lixu.clearedittext.ClearEditText>
38
39     <Button
40         android:id="@+id/login"
41         android:layout_width="fill_parent"
42         android:layout_height="wrap_content"
43         android:layout_marginLeft="10dip"
44         android:layout_marginRight="10dip"
45         android:background="@drawable/login_button_bg"
46         android:textSize="18sp"
47         android:textColor="@android:color/white"
48         android:layout_below="@+id/password"
49         android:layout_marginTop="25dp"
50         android:text="登录" />
51
52 </RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/search_clear_pressed" />
<item android:drawable="@drawable/search_clear_normal" />
</selector>

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/btn_style_one_pressed" android:state_pressed="true"></item>
<item android:drawable="@drawable/btn_style_one_focused" android:state_focused="true"></item>
<item android:drawable="@drawable/btn_style_one_normal"></item>

</selector>

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="@drawable/login_edit_pressed"></item>
<item android:state_pressed="true" android:drawable="@drawable/login_edit_pressed"></item>
<item android:drawable="@drawable/login_edit_normal"></item>
</selector>