[Solved] No adapter attached; skipping layout recyclerview error


there is a blunder in MainRecyclerView‘s onCreate()

 recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

 dataList = new ArrayList<>();     // your dataList is empty here...
 recyclerView.setAdapter(adapter); // your Adapter is null here. (not initialized)
 RequestJsonArray();

You need to call method which prepares your dataList before passing it to Adapter.
Do call methods at proper position.

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

    recyclerView = (RecyclerView) findViewById(R.id.recycler_view);        
    recyclerView.setHasFixedSize(true);
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));

    dataList = new ArrayList<>();

    RequestJsonArray();

    adapter = new RecyclerViewListview(this, dataList);        
    recyclerView.setAdapter(adapter);
}

Now inside your getData() comment out lines after dataList.add(data);, then clean project, rebuild then run.

Now as you have edited your question: try like this in onBindViewHolder() of RecyclerAdapter.

myHolder.song_name.setText("" + dataList.get(position).getSong_name());
myHolder.song_year.setText("" + dataList.get(position).getSong_year());
myHolder.song_year.setText("" + dataList.get(position).getSong_author());

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solved No adapter attached; skipping layout recyclerview error