Communicating between a fragment and an activity - best practices

Question

This question is mostly to solicit opinions on the best way to handle my app. I have three fragments being handled by one activity. Fragment A has one clickable element th

Answer 1

I am using Intents to communicate actions back to the main activity. The main activity is listening to these by overriding onNewIntent(Intent intent). The main activity translates these actions to the corresponding fragments for example.

So you can do something like this:

public class MainActivity extends Activity  {

    public static final String INTENT_ACTION_SHOW_FOO = "show_foo";
    public static final String INTENT_ACTION_SHOW_BAR = "show_bar";


   @Override
   protected void onNewIntent(Intent intent) {
        routeIntent(intent);
   }

  private void routeIntent(Intent intent) {
       String action = intent.getAction();
       if (action != null) {               
            switch (action) {
            case INTENT_ACTION_SHOW_FOO:
                // for example show the corresponding fragment
                loadFragment(FooFragment);
                break;
            case INTENT_ACTION_SHOW_BAR:
                loadFragment(BarFragment);
                break;               
        }
    }
}

Then inside any fragment to show the foo fragment:

Intent intent = new Intent(context, MainActivity.class);
intent.setAction(INTENT_ACTION_SHOW_FOO);
// Prevent activity to be re-instantiated if it is already running.
// Instead, the onNewEvent() is triggered
intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
getContext().startActivity(intent);