selector

<?xml version="1.0" encoding="utf-8"?>
<selector
	xmlns:android="http://schemas.android.com/apk/res/android">
	<item
		android:drawable="@drawable/two" />
	<!-- 默认显示 -->
	<item
		android:state_selected="true"
		android:drawable="@drawable/one" />
	<!-- 选中ListView -->
	<item
		android:state_focused="true"
		android:drawable="@drawable/one" />
	<!-- 获得焦点 -->
	<item
		android:state_pressed="true"
		android:drawable="@drawable/one" />
	<!-- 点击 -->
	<item
		android:state_enabled="true"
		android:drawable="@drawable/one" />
	<!-- 响应事件 -->
	<item
		android:state_checked="true"
		android:drawable="@drawable/one" />
	<!-- 选中 Checkbox -->
	<item
		android:state_expanded="true">
		<shape>
			<solid
				android:color="@color/button_selected" />
		</shape>
	</item>
	<!-- 展开 ExpandableListView -->
</selector>

该选择器可以使用在多钟属性中
可以将多个状态写在一个item中
color对应textColor