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;
} }
xml文件：
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>
运行效果图：