RecyclerView not showing items. Adapter is not called

Question

So I'm sure im making some trivial mistake somewhere and just can't see it. But I am simply trying to create a basic recyclerview list. However when I run the app nothing is shown, I put in log statements and found out that the adapter is created but nothing is ever called on it (like the bindviewholder, createviewholder, or getItemsize). I am unsure what is going on. Code is below"

MainActivity:

public class MainActivity extends GvrActivity {
    private ArrayList<SampleItem> videos;
    private RecyclerView recyclerView;
    private SampleAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        intialization();

    }

    private void intialization() {
        Log.e("tree","mata intialized");
        videos = new ArrayList<>();
        videos.add(new SampleItem("http://vid1383.photobucket.com/albums/ah303/intellidev/congo_zpsrtmtey4l.mp4", "Adrian", 50, 100));
        Log.e("tree","video added");
        recyclerView = (RecyclerView) findViewById(R.id.recycle);
        adapter = new SampleAdapter(this, videos);
        recyclerView.setAdapter(adapter);
        Log.e("tree","intialization completed");
    }
}

Adapter

public class SampleAdapter extends     RecyclerView.Adapter<SampleAdapter.ItemHolder> {
private Context context;
    private ArrayList<SampleItem> items;

    public SampleAdapter(Context context, ArrayList<SampleItem> videos) {

        this.context = context;
        this.items = videos;
        Log.e("tree","adapter created");
    }

    @Override
    public ItemHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.
                from(parent.getContext()).
                inflate(R.layout.video_item, parent, false);
        Log.e("tree","onCreateView Done");
        return new ItemHolder(itemView);
    }

    @Override
    public void onBindViewHolder(ItemHolder holder, int position) {
        Uri uri = Uri.parse(items.get(0).getVideoUrl());
        VrVideoView.Options options = new VrVideoView.Options();
        options.inputType = VrVideoView.Options.TYPE_STEREO_OVER_UNDER;
        try {
            holder.view.loadVideo(uri, options);
            holder.view.playVideo();
        } catch (IOException e) {
            Log.e("tree","onBindViewError " +e.getMessage());
        }
        holder.likes.setText(items.get(position).getNumOfLikes());
        holder.shares.setText(items.get(position).getNumOfShares());
        holder.profile.setText(items.get(position).getProfileName());
        Log.e("tree","onBindViewDone");

    }

    @Override
    public int getItemCount() {
        Log.e("tree","items size is "+items.size());
        return items.size();
    }

    class ItemHolder extends RecyclerView.ViewHolder {
        private VrVideoView view;
        private Button likes;
        private Button shares;
        private Button profile;

        public ItemHolder(View itemView) {
            // Stores the itemView in a public final member variable that can be used
            // to access the context from any ViewHolder instance.
            super(itemView);

            view = (VrVideoView) itemView.findViewById(R.id.video_view);
            likes = (Button) itemView.findViewById(R.id.likesButton);
            shares = (Button) itemView.findViewById(R.id.sharesButton);
            profile = (Button) itemView.findViewById(R.id.videoProfileButton);

        }

    }
}

You seem to have missed adding a [LayoutManager](https://developer.android.com/reference/android/support/v7/widget/RecyclerView.LayoutManager.html). — MohanadMohie, Oct 14 '16 at 15:10
Try this answer http://stackoverflow.com/a/35802948/2144418 recyclerView.setAdapter(adapter); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); — Aerim, Oct 14 '16 at 15:11
this causes a nullpointerexception in my CreateViewHolder. attempt to invoke getContext on a null object reference — Dreamers Org, Oct 14 '16 at 15:50

score 2 · Accepted Answer · answered Oct 14 '16 at 15:25

If you want to use a RecyclerView, you will need to work with the following:

RecyclerView.Adapter - To handle the data collection and bind it to the view
LayoutManager - Helps in positioning the items
ItemAnimator - Helps with animating the items for common operations such as Addition or Removal of item

item animator is optional but adapter and Layoutmanager are necessary

you forgot to add layout manager. this two line of code probably solves your problem

LinearLayoutManager llm = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(llm);

this causes a nullpointerexception in my CreateViewHolder. attempt to invoke getContext on a null object reference — Dreamers Org, Oct 14 '16 at 15:41

score 0 · Answer 2 · edited May 23 '17 at 12:16

0

Try this answer

https://stackoverflow.com/a/35802948/2144418

recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

edited May 23 '17 at 12:16

Community

1
1

answered Oct 14 '16 at 15:12

Aerim

1,960
3
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28

score 0 · Answer 3 · answered Oct 14 '16 at 15:13

0

Add

recyclerView.setLayoutManager(new LinearLayoutManager(context));

after recycler view intialisation. You can also set GridLayoutManager if you want to use grid of items.

answered Oct 14 '16 at 15:13

Harish Gyanani

1,366
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this causes a nullpointerexception in my CreateViewHolder. attempt to invoke getContext on a null object reference – Dreamers Org Oct 14 '16 at 15:43
Use this.context instead of parent.getContext() – Harish Gyanani Oct 15 '16 at 06:41

RecyclerView not showing items. Adapter is not called

3 Answers3