selector基础——按钮样式

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

<!-- 触摸时并且当前窗口处于交互状态 -->
<item android:state_pressed="true" android:state_window_focused="true" android:drawable= "@drawable/pic1" />

<!--  触摸时并且没有获得焦点状态 -->
<item android:state_pressed="true" android:state_focused="false" android:drawable="@drawable/pic2" />

<!--选中时的图片背景-->
<item android:state_selected="true" android:drawable="@drawable/pic3" />

<!--获得焦点时的图片背景-->
<item android:state_focused="true" android:drawable="@drawable/pic4" />

<!-- 窗口没有处于交互时的背景图片 -->
<item android:drawable="@drawable/pic5" />

</selector>

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 指定按钮按钮下时的图片 -->
<item android:state_pressed="true"
android:drawable="@drawable/red"
/>
<!-- 指定按钮松开时的图片 -->
<item android:state_pressed="false"
android:drawable="@drawable/purple"
/>
</selector>