一个ImageButton的不同状态调用不同的图片
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/selected_button5" android:state_focused="false" android:state_pressed="true"/>
<item android:drawable="@drawable/selected_button5" android:state_focused="true" android:state_pressed="false"/>
<item android:drawable="@drawable/selected_button5" android:state_focused="true" android:state_pressed="true"/>
<item android:drawable="@drawable/unselecte_button5"/>
</selector>