转：Android检查设备是否联网

 1 public static boolean isConnect(Context context) {
 2     ConnectivityManager connectionManager = (ConnectivityManager) context
 3             .getSystemService(Context.CONNECTIVITY_SERVICE);
 4     if (connectionManager != null) {
 5         NetworkInfo info = connectionManager.getActiveNetworkInfo();
 6         if (info != null && info.isConnected()) {
 7             if (info.getState() == NetworkInfo.State.CONNECTED) {
 8                 return true;
 9             }
10         }
11     }
12     return false;
13 }