佈局xml:
<Button
android:id="@+id/btnBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:background="@drawable/btn_back" /> //背景鏈接到另外一個xml樣式文件
btn_back.xml樣式文件:
<?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_back_pressed" />
<item android:state_focused="true" android:state_enabled="true" android:drawable="@drawable/btn_back_pressed" />
<item android:state_enabled="true" android:drawable="@drawable/btn_back_normal" /> //當按鈕不按下時顯示的背景
</selector>