android的xml中怎麼實現按鈕按下去變顏色

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//第一個例子
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:state_pressed="true" android:color="@color/baise"/>  <item android:state_pressed="false" android:color="@color/heise"/></selector>

 

//第二個例子<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_pressed="true">    <shape android:shape="rectangle">        <solid android:color="@color/greencolor"/>    </shape></item></selector>

 

//第三個例子<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true">        <shape android:shape="rectangle">            <solid android:color="@color/greencolor"/>            <corners android:radius="8dp"/>            <padding android:bottom="0dp" android:top="0dp"/>        </shape>    </item>    <item android:state_pressed="false">        <shape android:shape="rectangle">            <solid android:color="@color/graycolor"/>            <padding android:bottom="0dp" android:top="0dp"/>            <corners android:radius="8dp"/>        </shape>    </item></selector>

 

android的xml中怎麼實現按鈕按下去變顏色