完善退出功能，修改退出对话框确认过小

lizhanwei

2020-07-07 844a6141b652e9dc8b521d83988a8121584813d7

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<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
 
    <size android:height="20dp" android:width="40dp"/>
    <solid android:color="@android:color/darker_gray"/>
</shape>