修改NetWorkinfo 可能为null的bug

lizhanwei

2020-03-08 7915395e0199f64fb108f70df18a8df0c08876fb

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<?xml version="1.0" encoding="utf-8"?>
<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:maxLevel="0" android:drawable="@drawable/antenna_red" />
    <item android:maxLevel="1" android:drawable="@drawable/antenna" />
</level-list>