判断网络是否可用
1 ConnectivityManager mConnectivity = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
2 if (mConnectivity.getActiveNetworkInfo() != null
3 && mConnectivity.getActiveNetworkInfo().isAvailable()
4 && mConnectivity.getActiveNetworkInfo().isConnected()) {5 return true;
6 }
7 return false;
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