检测网络状态

/*

* 判断网络是否可用

*/

public static boolean isNetworkAvailable(Context ctx) { 
   try { 
       ConnectivityManager cm = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE); 
        NetworkInfo info = cm.getActiveNetworkInfo(); 
       return (info != null && info.isConnected()); 
    } catch (Exception e) { 
        e.printStackTrace(); 
       return false; 
    } 
}

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