access to activity from a broadcast receiver class

Question

I want to protect certain features behind device password. So if users try to use those feature, they have to confirm password again.

This is code in activity class.

Context appContext = activity.getApplicationContext();
RestrictionsManager rManager = (RestrictionsManager) appContext.getSystemService(appContext.RESTRICTIONS_SERVICE);
rManager.requestPermission(RestrictionsManager.ACTION_REQUEST_PERMISSION, "someID", new PersistableBundle());

This is code to handle response from the password-confirmation dialog in PermissionResponseReceiver class.

public class PermissionResponseReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
       ......
    }
}

Is there a simple way to reference to the original activity in PermissionResponseReceiver.onReceive(...). Currently I have to keep track of activity instance and provide a public static method to get it, but that seems very hacky and I'm looking for an alternative. Do you have any suggestions? Thanks.

Why do you want to do this? Holding any activity reference is dangerous, but especially a static one. If you explain what you are trying to achieve, someone will tell you the right way to do it. — Simon, Oct 31 '15 at 00:24
If password is confirmed then I want the activity to do something. Hence, I need to be able to access back to activity in onReceive() — hixhix, Oct 31 '15 at 00:50
Try moving the PermissionResponseReceiver as an inner class of your activity. — kzz, Oct 31 '15 at 01:12

Sound Conception · Answer 1 · 2015-10-31T01:44:34.120

Use a local broadcast to communicate between your PermissionResponseReceiver and your Activity.

In your PermissionResponseReceiver:

public class PermissionResponseReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(final Context context, Intent intent) {
       ......

    // Create the intent that will be broadcast
    Intent intent = new Intent("my-permission-response-action");
    // Add any extra data you want to put in the intent here..

    // Broadcast to any registered receivers
    LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
    }
}

In your Activity:

@Override
public void onResume() {
    super.onResume();

    final LocalBroadcastManager localBroadcastManager = LocalBroadcastManager.getInstance(this);

    // IntentFilter to define which actions mLocalBroadcastReceiver will respond to
    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction("my-permission-response-action");

    // Register for desired broadcasts
    localBroadcastManager.registerReceiver(mLocalBroadcastReceiver, intentFilter);
}

@Override
public void onPause() {

    // Unregister our mLocalBroadcastReceiver
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mLocalBroadcastReceiver);
    super.onPause();
}

/**
 * My Local Broadcast Receiver
 */
private BroadcastReceiver mLocalBroadcastReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(my-permission-response-action)) {
            // Our Activity has received the broadcast from PermissionResponseReceiver.
            // If we added any extras to the intent we can extract them here
            // for use in the Activity
        }
    }
};

access to activity from a broadcast receiver class

1 Answers1