重构代码；修改mapId为-1的exam_status表，表示考试状态

endian11

2020-08-13 a927c72c0f06ef5bd771e5ae00bc35155c271762

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