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：