How to implement infinite scroll in Gridlayout recylcerview

Question

I need help with the onscroll method...So Iwe tried a couple of things I found on stackoverflow but most of them work for linearlayout etc. Would be mighty helpful if you could point me in the right direction...

Im using the instagram api to load pictures. it sends 20 pictures at a time so i need to load more as i get to the bottom of the page

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

        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
        //configViews();
//        mLayoutManager = new GridLayoutManager(this, 2);
//        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {


            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);



            }
        });

....
}

Answer 1

Add this in OnScrolled.This is the basic idea.You can modify it as per your requirement

if(dy > 0){ // only when scrolling up

    final int visibleThreshold = 2;

    GridLayoutManager layoutManager = (GridLayoutManager)recyclerview.getLayoutManager();
    int lastItem  = layoutManager.findLastCompletelyVisibleItemPosition();
    int currentTotalCount = layoutManager.getItemCount();

    if(currentTotalCount <= lastItem + visibleThreshold){
        //show your loading view 
        // load content in background

    }
}

Answer 2

The logic of infinite scroll can be in the adaptor. Like that:

• Return size + 1 in your adaptor (for loading view)
• When the last position are asked, return a view that indicate loading
• Run a background task that will download next elements and change data in the adaptor

You can load next elements before last element are showed too.