android 点击按键背景发生变化

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btn_style.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_pressed" android:state_focused="true" />
    <item android:drawable="@drawable/btn_pressed" android:state_pressed="true" />
    <item android:drawable="@drawable/btn_normal" />
</selector>

btn_pressed.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <corners android:radius="5dip" />
            <solid android:color="@color/blue" />
        </shape>
    </item>

</layer-list>

btn_normal.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape>
            <corners android:radius="5dip" />
            <solid android:color="@color/news_item_has_read_textcolor" />
        </shape>
    </item>
    <item
        android:bottom="1dip"
        android:left="1dip"
        android:right="1dip"
        android:top="1dip">
        <shape>
            <corners android:radius="5dip" />
            <solid android:color="@color/white" />
        </shape>

</item>

</layer-list>

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