connectivity

日期：
  1. NetworkInfo.isAvailable()
  2. ConnectivityService.java
    getNumConnectedNetworks()
  3. WifiManager.java,WifiService.java,NetworkInfo.java,MobileDataStateTracker.java
    DataConnection.java,DataConnectionTracker.java,
  4. Reference
    1. NetworkInfo.isAvailable()
    2. ConnectivityManager

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