Android Programming: The Big Nerd Ranch Guide, 2nd Edition

From AsyncTask Back to the Main Thread

To finish off, let’s switch to the view layer and get PhotoGalleryFragment’s RecyclerView to display some captions.

First define a ViewHolder as an inner class.

Listing 23.14  Adding a ViewHolder implementation (PhotoGalleryFragment.java)

public class PhotoGalleryFragment extends Fragment {

    private static final String TAG = "PhotoGalleryFragment";

    ...

    private class PhotoHolder extends RecyclerView.ViewHolder {
        private TextView mTitleTextView;

        public PhotoHolder(View itemView) {
            super(itemView);

            mTitleTextView = (TextView) itemView;
        }

        public void bindGalleryItem(GalleryItem item) {
            mTitleTextView.setText(item.toString());
        }
    } private class FetchItemsTask extends AsyncTask<Void,Void,Void> { ...