Dynamically register/unregister a broadcast receiver in android

Question

I want to dynamically register and unregister my receiver class with the broadcast: "android.net.wifi.STATE_CHANGE" This works very well if I do this in the manifest. But this makes it static. I want to do it dynamically in the activity class. What is its correspondent command in the activity class?

This is what my code is... and I am getting a problem because of registering and unregistering(multiple times) my receiver(which is starting a service).

public class startScreen extends Activity {
    /** Called when the activity is first created. */

    private BroadcastReceiver receiver = new BroadcastReceiver() {    

        @Override
        public void onReceive(Context context, Intent intent) {
            Intent serviceIntent = new Intent();
            serviceIntent.setAction("com.example.MyService");
            context.startService(serviceIntent);    
        }    
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.initial);

        final IntentFilter filter = new IntentFilter();
        filter.addAction("android.net.wifi.STATE_CHANGE");   

        Button button = (Button) findViewById(R.id.button1);
        final ToggleButton toggleButton = (ToggleButton) findViewById(R.id.toggleButton1);

        try {
                ...some code...
            if (bool == true) {
                toggleButton.setChecked(true);
                this.registerReceiver(receiver, filter);
            } else
                toggleButton.setChecked(false);
        } catch (Exception e) {
            Log.e("Error", "Database", e);
        } finally {
                ...
        }

        toggleButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                if ((toggleButton.isChecked())) {
                    getBaseContext().registerReceiver(receiver, filter);

                } else {
                    if (receiver != null) {
                        getBaseContext().unregisterReceiver(receiver);
                        receiver = null;
                    }

                }
            }
        });
    }    

    @Override
    protected void onResume() {
        super.onResume();
        if (bool == true) {
            if (receiver == null)
                this.registerReceiver(receiver, filter);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (receiver != null) {
            this.unregisterReceiver(receiver);
            receiver = null;
        }
    }
}

Answer 1

Don't add dynamic broadcast receiver in onReceive on broadcast file. Add it on first activity or main activity of your application. If you needed it only when your application is open. But if you need it always received response just added it on manifest file

Register dynamic broadcast receiver on main activity

MyReceiver reciver;

@Override
protected void onResume() {
    super.onResume();
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("android.net.wifi.WIFI_STATE_CHANGED");
    intentFilter.addAction("android.net.wifi.STATE_CHANGE");
    reciver = new MyReceiver();
    registerReceiver(reciver, intentFilter);
}

Unregister that broadcast receiver on activity stop or closed

@Override
protected void onStop() {
    super.onStop();
    unregisterReceiver(reciver);
}