修改死亡监听，当远程接口为空时返回，不会空则重新绑定service

lizhanwei

2020-07-07 b2c9c057bb1254d34bd5ef96109651becc33e0d9

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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>