app启动的时候，删除三天以前的日志；打印CMD命令，以十六进制打印

lizhanwei

2020-01-15 5ac1ba281daa37803ea5986bc24c3482f9bbd543

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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>