Android BroadcastReceiver : Unable to start and stop BroadcastReceiver,manually, which starts automaticly

Question

I created a brodcastReceiver for Wi-Fi ,every thing is working fine ,except ,that when i lunch the application ,the broadcastreceiver start directly scanning ,and i can't stop it, and keeps running even i go out from the application. I tryed to controle the broadcast receiver from the main activity ,but it seems that there is a broblem. Can someone take a look to my code, and if it's possible ,tell me what could be the problem.

Thank you in advance.

PS :when click buttons ,the toasts are working,but there is no influence on the brodcast receiver.

I'm lunching a service in the brodcastreceiver, could it have an influence on the broblem ?

                                  **EDIT** 

This is my MainActivity

    public class MainActivity extends Activity {
    int newRssi;
    List<String> listDebitDistance = new ArrayList<String>(); 
    WifiManager wifi;

    private final BroadcsatReceiverMnager broad = new BroadcsatReceiverMnager();
    ArrayList<int[]> listCursorReçue = new ArrayList<int[]>();
     IntentFilter rssiFilter = new          IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }




/**
 * This method enables the Broadcast receiver registered in the AndroidManifest file.
 * @param view
 */
    public void enableBroadcastReceiver(View view){
        switch (view.getId()){

        case R.id.button1 :

             super.registerReceiver(broad, new IntentFilter("android.intent.action.BOOT_COMPLETED"));

            this.registerReceiver(broad, rssiFilter);
            WifiManager wifiMan=(WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
            wifiMan.startScan();

          Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();

            break; 
        }

        }
/**
* This method disables the Broadcast receiver registered in the AndroidManifest file.
* @param view
*/
public void disableBroadcastReceiver(View view){
    switch (view.getId()){

    case R.id.button2 :
        //this.unregisterReceiver(broad); //this gives the exception 
     unregisterReceiver(broad); //this methode gives the exception too
      Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();


        break; 
    }

}

public void onPause() {

    super.onPause();
    this.unregisterReceiver(broad);
//S'il y a un appel l'app crash !!! a voir !!!!
}
/**
 * Broadcast receiver to update 
 */

public void onResume() {
    super.onResume();
   // BroadcsatReceiverMnager broad = new BroadcsatReceiverMnager();

    //Note: Not using RSSI_CHANGED_ACTION because it never calls me back.


    WifiManager wifiMan=(WifiManager)MainActivity.this.getSystemService(Context.WIFI_SERVICE);
    wifiMan.startScan();

}
}

And this is my BroadcsatReceiverMnager class

  public class BroadcsatReceiverMnager extends BroadcastReceiver {
    int newRssi;

     int rssi1 ;
   int rssi2;
   int rssi3 ;
   int rssiOp1=0  ;
    int rssiOp2 =0 ;
    int rssiOp3=0  ;
    WifiManager wifi;



    @Override
    public void onReceive(Context arg0, Intent arg1) {      
        Toast.makeText(arg0,"MyTag BroadcsatReceiverMnager "+ "onReceive", Toast.LENGTH_LONG).show();

        wifi = (WifiManager)arg0.getSystemService(Context.WIFI_SERVICE);

    if(arg1.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION )){//
             List<ScanResult> results = wifi.getScanResults();
            Toast.makeText(arg0, "results"+results, Toast.LENGTH_SHORT).show();
            rssiOp1 =   results.get(0).level;
            rssiOp2 =   results.get(1).level;
            rssiOp3 =   results.get(2).level;

      }
     WifiManager wifiMan=(WifiManager)arg0.getSystemService(Context.WIFI_SERVICE);
      wifiMan.startScan();
      int newRssi = wifiMan.getConnectionInfo().getRssi();
      Toast.makeText(arg0, "BroadcsatReceiverMnager"+newRssi, Toast.LENGTH_SHORT).show();
}


}

Answer 1

If you want to control the registration and the un-registration of your receiver, don't define it in your manifest at all. as I said in this answer :

If you register the receiver in the manifest, the handler of the receiver will start each time that a the correspondent event come. example: the messenger of facebook is lunched every time that you have a connection to show you your notifications... or other applications are lunched when you connect to propose updates ... in other words, the receiver is always registered.

In you case, define the receiver in your activity, register it and unregister it in the same activity.

/**
 * the intent of communication with the Brodcast receiver
 */
IntentFilter intentFilter = new IntentFilter();



/**
 * the BroadcastReceiver 
 */
BroadcastReceiver yourBroadcastReceiver = new BroadcsatReceiverMnager ();

in your onCreat() :

// set the action
intentFilter.addAction("SCAN_RESULTS_AVAILABLE_ACTION");

register it :

    registerReceiver(yourBroadcastReceiver , intentFilter);

unregister it :

unregisterReceiver(yourBroadcastReceiver);

So, in you listeners :

    /**
 * This method enables the Broadcast receiver registered in the AndroidManifest file.
 * @param view
 */
    public void enableBroadcastReceiver(View view){
        switch (view.getId()){

        case R.id.button1 :

           registerReceiver(yourBroadcastReceiver , intentFilter);

              Toast.makeText(this, "Enabled broadcast receiver", Toast.LENGTH_SHORT).show();

            break; 
        }

        }
/**
* This method disables the Broadcast receiver registered in the AndroidManifest file.
* @param view
*/
public void disableBroadcastReceiver(View view){
    switch (view.getId()){

    case R.id.button2 :

        unregisterReceiver(yourBroadcastReceiver);

          Toast.makeText(this, "Disabled broadcst receiver", Toast.LENGTH_SHORT).show();


        break; 
    }

}

The answer to your last question in the comments :

1/ you have a scan to do, to get some information.

2/ you want to lunch the scan only when you are in main activity, by action (by intent filter).

===> you use your receiver in this activity : - register it in onResume() and unregister it in onPause() - do the scan (and what you want to do with the data that it will return) in the onReceive() of the receiver.

3/ you want to manage when to activate the Receiver, and when to desable it : the receiver doesn't only depend on the life cycle of the Activity: ===> then you add a button to activate or disable it (register/unregister).