TextView、Button的点击改变背景

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对于TextView、Button，点击时可以改变背景，松手之后恢复，state_pressed才可以生效

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/bg_round_blue_f1_22" android:state_pressed="true"/>
    <item android:drawable="@drawable/bg_round_gray_22"/>
</selector>