[Solved] How to fix this RecyclerView code?

You just forgot to set Adapter to your mRecyclerViews

check in your loadData() method

check this line //mRecyclerViews.setAdapter(mAdapter);

Try this

private void loadData(){

        mArrayList = new ArrayList<>();

        mArrayList.add(new Model("Constraint Layout"));
        mArrayList.add(new Model("Linear Layout"));
        mArrayList.add(new Model("Relative Layout"));
        mArrayList.add(new Model("Card View"));
        mArrayList.add(new Model("Scroll Views"));
        mArrayList.add(new Model("Grid View"));



        mAdapter = new MyAdapter(mArrayList);
        mRecyclerViews.setAdapter(mAdapter);

    }

EDIT

You need to Declare your mRecyclerView; global like your mArrayList and mAdapter

private ArrayList<Model> mArrayList;
private MyAdapter mAdapter;
RecyclerView mRecyclerView;