CODEWITHSUNDEEP
androidbroadcastreceiver
user2312945
user2312945

Reputation: 137

Broadcast receiver: check the wifi presence

I have done a code exploiting the Broadcast receiver in order to call the method on Receive when the status of connection change and show a toast indicating the change. In that sense I have a separated class in which is implemented the broadcast receiver in that way:

public class Receiver extends BroadcastReceiver {

private static final String DEBUG_TAG = "NetworkStatusExample";

  @Override

  public void onReceive(Context context, Intent intent) {

      // Shows a toast when the connectivity state change
      Toast.makeText(context, "stato wifi cambiato",
      Toast.LENGTH_LONG).show();
      Log.d("prova", "action: "
                 + intent.getAction())     

  }
}

it works recalling correctly the method OnReceive() when there is a network state change and showing the toast.

In the main file I have put a code that once a button is pressed it verifies if the Wifi is connected or not also in this case showing a toast with a message "Wifi connected: true/false" depending on the presence or not of connectivity. The code that works also in this case is: 

public class MainActivity extends Activity {

private static final String DEBUG_TAG = "NetworkStatusExample";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ConnectivityManager connMgr = (ConnectivityManager) 
            getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo =     connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
    final boolean isWifiConn = networkInfo.isConnected();
    String wifiStateText = "No State";
    Log.d(DEBUG_TAG, "Wifi connected: " + isWifiConn);
    Button prova = (Button) findViewById(R.id.button1);
    prova.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Context context = getApplicationContext();

            CharSequence text = "Wifi connected: " + isWifiConn;
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
        }
    });

}

Now I'm trying to embedding the last part of the code in the method OnReceive() defined above in order to let's do all in automatic once there is a network connectivity change ando so I the resulting code of the Broadcast receiver is that one:

public class Receiver extends BroadcastReceiver {

private static final String DEBUG_TAG = "NetworkStatusExample";
  // Verifica se il wifi è connesso

  @Override

  public void onReceive(Context context, Intent intent) {

      // Shows a toast when the connectivity state change
      Toast.makeText(context, "stato wifi cambiato",
      Toast.LENGTH_LONG).show();
      Log.d("prova", "action: "
                 + intent.getAction());


      ConnectivityManager connMgr = (ConnectivityManager) 
                getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI); 
            final boolean isWifiConn = networkInfo.isConnected();
          String wifiStateText = "No State";
            Log.d(DEBUG_TAG, "Wifi connected: " + isWifiConn);

      // Toast that shows if the wifi is connected
      CharSequence text = "Wifi connected: " + isWifiConn;
        int duration = Toast.LENGTH_SHORT;

        Toast toast = Toast.makeText(context, text, duration);
        toast.show();     


  }


}

In that case I get this error: 

the method getsystemservice(string) is undefined for the type Receiver

on this line:

getSystemService(Context.CONNECTIVITY_SERVICE);

What's wrong? What have I to do to fix it?

Upvotes: 0

Views: 697

Answers (2)

RvdK
RvdK

Reputation: 19790

You need to use the 'context' parameter: context.getSystemService(Context.CONNECTIVITY_SERVICE);

The BroadcastReceiver is not derived from Context.

Upvotes: 1

Brtle
Brtle

Reputation: 2297

You can try this :

context.getSystemService(Context.CONNECTIVITY_SERVICE);

Upvotes: 0

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