Check different Network status in Android

public class CheckConnectionsDemo extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      checkAvailableConnection();
    }
    
 void checkAvailableConnection()
   {
    ConnectivityManager connMgr = (ConnectivityManager)
    this.getSystemService(Context.CONNECTIVITY_SERVICE);  
    final android.net.NetworkInfo wifi = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    
    final android.net.NetworkInfo mobile = connMgr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
     if( wifi.isAvailable() )
        { Toast.makeText(this, "Wifi Available" ,Toast.LENGTH_LONG).show();
        }
        else if( mobile.isAvailable() )
        {   Toast.makeText(this, "3G Available" ,Toast.LENGTH_LONG).show();
        }
        else{  
            Toast.makeText(this, "No Network Available" ,Toast.LENGTH_LONG).show();
        }
    }
}