寫一個selector檔案
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true">
            <shape android:shape="rectangle">
            <solid android:color="#ff3300"/>
        </shape>
    </item>
    <item android:state_pressed="false">
        <shape android:shape="rectangle">
        <solid android:color="#ffffff"/>
    </shape>
    </item>
</selector>

把它當做背景設定上即可。