在res/drawable文件夾新增一個XML文件，此文件設置了圖片的觸發狀態，你可以設置 state_pressed，state_checked，state_pressed，state_selected，state_focused，state_enabled 等幾個狀態：
背景配置文件：
button_bg.xml
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true"
android:state_pressed="true"
android:drawable="@drawable/button_focused" />
<item android:state_focused="false"
android:state_pressed="true"
android:drawable="@drawable/button_defocused" />
<item android:state_focused="true"
android:drawable="@drawable/button_focused" />
<item android:state_focused="false"
android:drawable="@drawable/button_defocused" />
</selector>
button_focused.xml //實現漸變色的效果
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#505050" android:endColor="#C0C0C0"
android:paddingTop="5dp" android:angle="0" />
<corners android:radius="5dp" />
<stroke android:width="2dp" android:color="#FFFF9200" />
</shape>
button_defocused.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient android:startColor="#505050" android:endColor="#C0C0C0"
android:paddingTop="5dp" android:angle="0" />
<corners android:radius="5dp" />
</shape>
字體顏色配置文件：
button_font.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:color="#FFF" />
<item android:state_focused="true" android:color="#FFF" />
<item android:state_pressed="true" android:color="#FFF" />
<item android:color="#000" />
</selector>
我的程序中只做了簡單設置：
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="true"
android:state_pressed="true"
android:drawable="@drawable/btn_poilist1" />
<item
android:state_enabled="true"
android:state_pressed="false"
android:drawable="@drawable/btn_poilist" />
</selector>
普通狀態按鈕爲前面的，按下狀態的按鈕爲後面的。