Android 檢查網路連線的兩個方法

一個是用 NetworkInfo 的 isConnected，一個是用 ConnectivityManager 的 getNetworkInfo(?).getState()

private void conditionCheck() {

        

         try {

              ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

             

              NetworkInfo activeNetwork = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

              if (activeNetwork.isConnected())

                  Log.w(name, "1 ok");

              else

                  Log.w(name, "1 fail");

             

              NetworkInfo activeNetwork1 = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

              if (activeNetwork1.isConnected())

                  Log.w(name, "2 ok");

              else

                  Log.w(name, "2 fail");

                           

              if ((cm.getNetworkInfo(0).getState() == NetworkInfo.State.CONNECTED))

                  Log.w(name, "Mobile network is ok");

              else

                  Log.w(name, "Mobile network is fail");

             

              if ((cm.getNetworkInfo(1).getState() == NetworkInfo.State.CONNECTED))

                  Log.w(name, "WiFi network is ok");  

              else

                  Log.w(name, "WiFi network is fail");

         } catch(Exception e) {

              e.printStackTrace();

         }

     }

但是以下這段卻不 work…還不知道為什麼

if ((cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.DISCONNECTED)

                       && (cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.DISCONNECTED))

Log.w(name, "Cannot reach the pattern!");