How to get callback from activity back to fragment using interface

Question

I have a fragment, where I have a button to choose an image from a gallery. The gallery is open successfully, but when I choose the image, I do not get the result from activity. So I consider to use a callback (interface). However, I do know how.

Could you suggest me something please?

interface

public interface CallbackListener {
    void onPhotoTake(String url);
}

in fragment click

@OnClick(R.id.addPhoto) void photo() {
        if (isStoragePermissionGranted()) {
            Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            context.startActivityForResult(i, RESULT_LOAD_IMAGE);
        }
}

activity

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
}

• here I would like to send result back to fragment using interface

Answer 1

If you want to send data back to fragment class there can be a number of ways to do that:

First

1. Create a public method in fragment class

2. Call that method using the fragment object in activity class's onActivityResult()

---

Second

1. Create an interface in activity and implement that interface in fragment. Then with the help of interface, send your data to fragment e.g.

Activity class

DataReceivedListener listener;

public void setDataReceivedListener(DataReceivedListener listener) {
    this.listener = listener;
}

public interface DataReceivedListener {
    void onReceived(int requestCode, int resultCode, Intent data)
}

Fragment Class

class fragment extends Fragments implements yourActivityClassName.DataReceivedListener {
    @Override
    void onReceived(int requestCode, int resultCode, Intent data) {

    }

    onViewCreated(...) {
        ((yourActivityName) getActivity()).setDataReceivedListener(this);
    }
}

in Acitivity class

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (listener != null) {
        listener.onActivityResult(requestCode, resultCode, data);
    }
}