按钮简单选择器

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

<item android:state_pressed="true">

<shape android:shape="rectangle">

<corners android:radius="2dp" />

<solid android:color="@color/colorAccent" />

<stroke android:width="1dp" android:color="@color/colorPrimary" />

</shape>

</item>

</selector>