CODEWITHSUNDEEP
javaandroidandroid-fragments
mTsyS
mTsyS

Reputation: 13

How to manage android app with one activity and many fragments?

I need some help with how manage an android application with one activity and many fragments. I choice this pattern because i think it could make the app more rapid and efficient (at least I figured that out from my readings on fragments) but i stuck myself on the very first steps.

The facts are:

Now: If to exchange data among fragments I should use the activity as a bridge, implementing an interface to let fragment-activity communicate each other, how could the activity implements more that one interface to communicate and exchange data with more that on fragment?

I.E.:

Let's suppose I have a HomeFragment that is the main view of the app. In this fragment I have a RecyclerView that handles a list of items.

If I click on one item of the list I should open a new fragment (fullscreen-size so that the new fragment replace completely the HomeFragment) that shows some details about the item clicked.

I can't do this because my activity already implements an interface for the navigationDrawer so how could i exchange data between fragment and activity?

PS: Sorry for my bad english, I hope I've been clear

Upvotes: 0

Views: 401

Answers (1)

Dr. Ehsan Ali
Dr. Ehsan Ali

Reputation: 4884

An activity can implement as many as fragments that it likes, for example:

public class MyActivity extends FragmentActivity implements
    AppleFragment.OnAppleInteractionListener, 
    OrangeFragment.OnOrangeInteractionListener {    

    @Override
    public void onAppleInteraction(int quantity_sold) {
    }

    @Override
    public void onOrangeInteraction(int quantity_sold) {
    }
}

Above code show how easily you can have one activity to implement two fragments.

In separate file you must define the fragments like this:

public class AppleFragment extends Fragment {
    public interface OnAppleInteractionListener {
    void onAppleInteraction(int quantity_sold);
    }
}

and 

public class OrangeFragment extends Fragment {
    public interface OnOrangeInteractionListener {
    void onOrangeInteraction(int quantity_sold);
    }
}

Upvotes: 1

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