在drawable中創建layer-list,可命名文件如:button_circle_shape.xml(在操作中後綴.xml不用填)。以下案例中還添加了selector,當按鈕被點擊時,按鈕邊框由黑色變爲紅色,未處於點擊狀態時爲黑色。在佈局中可以這樣引用:android:background="@drawable/button_circle_shape"
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="oval">
<!--邊框角度-->
<corners android:radius="10dip" />
<!--外邊框顏色-->
<solid android:color="@color/colorGreen" />
</shape>
</item>
<item android:state_pressed="false">
<shape android:shape="oval">
<!--邊框角度-->
<corners android:radius="10dip" />
<!--外邊框顏色-->
<solid android:color="@color/colorBlack" />
</shape>
</item>
</selector>
</item>
<!--離邊框的厚度-->
<item
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp">
<shape android:shape="oval">
<!--邊框角度-->
<corners android:radius="10dip" />
<!--外邊框顏色,這個爲內部顏色-->
<solid android:color="@color/colorLightGray" />
</shape>
</item>
</layer-list>