• 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

     1 package com.lixu.clearedittext;
 2 
 3 
 4 import android.app.Activity;
 5 import android.os.Bundle;
 6 import android.text.TextUtils;
 7 import android.view.View;
 8 import android.view.View.OnClickListener;
 9 import android.widget.Button;
10 import android.widget.Toast;
11 
12 public class MainActivity extends Activity {
13     private Toast mToast;
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19         
20         final ClearEditText username = (ClearEditText) findViewById(R.id.username);
21         final ClearEditText password = (ClearEditText) findViewById(R.id.password);
22         
23         ((Button) findViewById(R.id.login)).setOnClickListener(new OnClickListener() {
24             
25             @Override
26             public void onClick(View v) {
27                 if(TextUtils.isEmpty(username.getText())){
28                     //设置晃动
29                     username.setShakeAnimation();
30                     //设置提示
31                     showToast("用户名不能为空");
32                     return;
33                 }
34                 
35                 if(TextUtils.isEmpty(password.getText())){
36                     password.setShakeAnimation();
37                     showToast("密码不能为空");
38                     return;
39                 }
40             }
41         });
42     }
43     
44     /**
45      * 显示Toast消息
46      * @param msg
47      */
48     private void showToast(String msg){
49         if(mToast == null){
50             mToast = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
51         }else{
52             mToast.setText(msg);
53         }
54         mToast.show();
55     }
56 
57 
58 }
      1 package com.lixu.clearedittext;
  2 
  3 
  4 import android.content.Context;
  5 import android.graphics.drawable.Drawable;
  6 import android.text.Editable;
  7 import android.text.TextWatcher;
  8 import android.util.AttributeSet;
  9 import android.view.MotionEvent;
 10 import android.view.View;
 11 import android.view.View.OnFocusChangeListener;
 12 import android.view.animation.Animation;
 13 import android.view.animation.CycleInterpolator;
 14 import android.view.animation.TranslateAnimation;
 15 import android.widget.EditText;
 16 
 17 public class ClearEditText extends EditText implements  
 18         OnFocusChangeListener, TextWatcher { 
 19     /**
 20      * 删除按钮的引用
 21      */
 22     private Drawable mClearDrawable; 
 23     /**
 24      * 控件是否有焦点
 25      */
 26     private boolean hasFoucs;
 27  
 28     public ClearEditText(Context context) { 
 29         this(context, null); 
 30     } 
 31  
 32     public ClearEditText(Context context, AttributeSet attrs) { 
 33         //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
 34         this(context, attrs, android.R.attr.editTextStyle); 
 35     } 
 36     
 37     public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
 38         super(context, attrs, defStyle);
 39         init();
 40     }
 41     
 42     
 43     private void init() { 
 44         //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
 45         mClearDrawable = getCompoundDrawables()[2]; 
 46         if (mClearDrawable == null) { 
 47 //            throw new NullPointerException("You can add drawableRight attribute in XML");
 48             mClearDrawable = getResources().getDrawable(R.drawable.delete_selector); 
 49         } 
 50         
 51         mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 
 52         //默认设置隐藏图标
 53         setClearIconVisible(false); 
 54         //设置焦点改变的监听
 55         setOnFocusChangeListener(this); 
 56         //设置输入框里面内容发生改变的监听
 57         addTextChangedListener(this); 
 58     } 
 59  
 60  
 61     /**
 62      * 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
 63      * 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
 64      * 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
 65      */
 66     @Override 
 67     public boolean onTouchEvent(MotionEvent event) {
 68         if (event.getAction() == MotionEvent.ACTION_UP) {
 69             if (getCompoundDrawables()[2] != null) {
 70 
 71                 boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
 72                         && (event.getX() < ((getWidth() - getPaddingRight())));
 73                 
 74                 if (touchable) {
 75                     this.setText("");
 76                 }
 77             }
 78         }
 79 
 80         return super.onTouchEvent(event);
 81     }
 82  
 83     /**
 84      * 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
 85      */
 86     @Override 
 87     public void onFocusChange(View v, boolean hasFocus) { 
 88         this.hasFoucs = hasFocus;
 89         if (hasFocus) { 
 90             setClearIconVisible(getText().length() > 0); 
 91         } else { 
 92             setClearIconVisible(false); 
 93         } 
 94     } 
 95  
 96  
 97     /**
 98      * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
 99      * @param visible
100      */
101     protected void setClearIconVisible(boolean visible) { 
102         Drawable right = visible ? mClearDrawable : null; 
103         setCompoundDrawables(getCompoundDrawables()[0], 
104                 getCompoundDrawables()[1], right, getCompoundDrawables()[3]); 
105     } 
106     
107     
108     /**
109      * 当输入框里面内容发生变化的时候回调的方法
110      */
111     @Override 
112     public void onTextChanged(CharSequence s, int start, int count, 
113             int after) { 
114                 if(hasFoucs){
115                     setClearIconVisible(s.length() > 0);
116                 }
117     } 
118  
119     @Override 
120     public void beforeTextChanged(CharSequence s, int start, int count, 
121             int after) { 
122          
123     } 
124  
125     @Override 
126     public void afterTextChanged(Editable s) { 
127          
128     } 
129     
130    
131     /**
132      * 设置晃动动画
133      */
134     public void setShakeAnimation(){
135         this.setAnimation(shakeAnimation(5));
136     }
137     
138     
139     /**
140      * 晃动动画
141      * @param counts 1秒钟晃动多少下
142      * @return
143      */
144     public static Animation shakeAnimation(int counts){
145         Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
146         translateAnimation.setInterpolator(new CycleInterpolator(counts));
147         translateAnimation.setDuration(1000);
148         return translateAnimation;
149     }
150  
151  
152 }

    xml文件：

     1  1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2  2     xmlns:tools="http://schemas.android.com/tools"
 3  3     android:layout_width="match_parent"
 4  4     android:layout_height="match_parent"
 5  5     android:background="#95CAE4">
 6  6 
 7  7 
 8  8     <com.lixu.clearedittext.ClearEditText
 9  9         android:id="@+id/username"
10 10         android:layout_marginTop="60dp"
11 11         android:layout_width="fill_parent"
12 12         android:background="@drawable/login_edittext_bg" 
13 13         android:drawableLeft="@drawable/icon_user"
14 14         android:layout_marginLeft="10dip"
15 15         android:layout_marginRight="10dip"
16 16         android:singleLine="true"
17 17         android:drawableRight="@drawable/delete_selector"
18 18         android:hint="输入用户名"
19 19         android:layout_height="wrap_content" >
20 20 
21 21     </com.lixu.clearedittext.ClearEditText>
22 22 
23 23     <com.lixu.clearedittext.ClearEditText
24 24         android:id="@+id/password"
25 25         android:layout_marginLeft="10dip"
26 26         android:layout_marginRight="10dip"
27 27         android:layout_marginTop="10dip"
28 28         android:drawableLeft="@drawable/account_icon"
29 29         android:hint="输入密码"
30 30         android:singleLine="true"
31 31         android:password="true"
32 32         android:drawableRight="@drawable/delete_selector"
33 33         android:layout_width="fill_parent"
34 34         android:layout_height="wrap_content"
35 35         android:layout_below="@id/username"
36 36         android:background="@drawable/login_edittext_bg" >
37 37     </com.lixu.clearedittext.ClearEditText>
38 38 
39 39     <Button
40 40         android:id="@+id/login"
41 41         android:layout_width="fill_parent"
42 42         android:layout_height="wrap_content"
43 43         android:layout_marginLeft="10dip"
44 44         android:layout_marginRight="10dip"
45 45         android:background="@drawable/login_button_bg"
46 46         android:textSize="18sp"
47 47         android:textColor="@android:color/white"
48 48         android:layout_below="@+id/password"
49 49         android:layout_marginTop="25dp"
50 50         android:text="登录" />
51 51 
52 52 </RelativeLayout>
    1 <?xml version="1.0" encoding="utf-8"?>
2 <selector
3   xmlns:android="http://schemas.android.com/apk/res/android">
4     <item android:state_pressed="true" android:drawable="@drawable/search_clear_pressed" />
5     <item android:drawable="@drawable/search_clear_normal" />
6 </selector>
    1 <?xml version="1.0" encoding="UTF-8"?>
2 <selector xmlns:android="http://schemas.android.com/apk/res/android">
3 
4     <item android:drawable="@drawable/btn_style_one_pressed" android:state_pressed="true"></item>
5     <item android:drawable="@drawable/btn_style_one_focused" android:state_focused="true"></item>
6     <item android:drawable="@drawable/btn_style_one_normal"></item>
7 
8 </selector>
    1 <?xml version="1.0" encoding="UTF-8"?>
2 <selector xmlns:android="http://schemas.android.com/apk/res/android">
3     <item android:state_focused="true" android:drawable="@drawable/login_edit_pressed"></item>
4     <item android:state_pressed="true" android:drawable="@drawable/login_edit_pressed"></item>
5     <item android:drawable="@drawable/login_edit_normal"></item>
6 </selector>

    运行效果图：
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  • 原文地址：https://www.cnblogs.com/labixiaoxin/p/5038159.html
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