Android中Button 有focused, selected, pressed 等不同状态，通过配置一个XML格式的 drawable "selector" 即可实现”在不同状态下显示不同背景图片“的功能。
1. 在res/drawable目录下添加一个xml文件，用来描述Button在不同状态下对应的不同图片。我这里给该xml文件命名为btn_background.xml
<?
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/btn_pressed" /> <!-- pressed -->
< item android:state_focused ="true"
android:drawable ="@drawable/btn_normal" /> <!-- focused -->
< item android:drawable ="@drawable/btn_normal" /> <!-- default -->
</ selector >
< selector xmlns:android ="http://schemas.android.com/apk/res/android" >
< item android:state_pressed ="true"
android:drawable ="@drawable/btn_pressed" /> <!-- pressed -->
< item android:state_focused ="true"
android:drawable ="@drawable/btn_normal" /> <!-- focused -->
< item android:drawable ="@drawable/btn_normal" /> <!-- default -->
</ selector >
2. 在res/layout目录下，对应的layout xml文件中，将Button的android:background属性设置为btn_background即可。
<?
xml version="1.0" encoding="utf-8"
?>
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< Button
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:background ="@drawable/btn_background"
/>
</ LinearLayout >
< LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
android:orientation ="vertical"
android:layout_width ="fill_parent"
android:layout_height ="fill_parent"
>
< Button
android:layout_width ="wrap_content"
android:layout_height ="wrap_content"
android:background ="@drawable/btn_background"
/>
</ LinearLayout >
3.运行结果
默认状态(unselected)
点击状态(pressed)
参考资料:
Google Android开发文档:ImageButton
http://developer.android.com/reference/android/widget/ImageButton.html
我的Twitter @mainroadlee
http://twitter.com/#!/mainroadlee
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