sectionedrecyclerviewadapter

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 … Read more