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<View
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_marginRight="16dp"
android:layout_marginBottom="16dp"
android:elevation="15dp"
android:background="@drawable/btn_float_round_add"
>
</View>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/ic_add_btn_normal">
<item>
<shape android:shape="oval" >
<corners android:radius="360dp" />
</shape>
</item>
</item>
<item android:drawable="@drawable/ic_add_btn_pressed" android:state_pressed="true">
<item>
<shape android:shape="oval" >
<corners android:radius="360dp" />
</shape>
</item>
</item>
<item android:drawable="@drawable/ic_add_btn_pressed" android:state_focused="true">
<item>
<shape android:shape="oval" >
<corners android:radius="360dp" />
</shape>
</item>
</item>
</selector>
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<layer-list>
<item android:drawable="按压时背景图"/>
<item android:drawable="按压时阴影"/>
</layer-list>
</item>
<item android:drawable="普通状态时背景图"/>
</selector>