RecyclerView Endless Infinite Scrolling Issue

Question

I am trying to implement Endless Infinite Scrolling with RecyclerView, but I am only getting first 10 records, not getting next 10 records and even not getting any progress

Answer 1

Issue-1: You have created a new instance of mAdapter before setting the LayoutManager for RecyclerView. Thereby the constructor code in the DataAdapter to add ScrollListener is not executed since recyclerView.getLayoutManager() returns null:

    if (recyclerView.getLayoutManager() instanceof LinearLayoutManager){
        // code to add ScrollListener is never executed
    }

Fix: First set the LayoutManager for the Recyclerview and then create the adapter like below:

    // use a linear layout manager
    mRecyclerView.setLayoutManager(mLayoutManager);
    mAdapter = new DataAdapter(temArray, mRecyclerView);
    // set the adapter object to the Recyclerview
    mRecyclerView.setAdapter(mAdapter);

Issue-2: You have used temArray to create DataAdapter but in onLoadMore() you are using the studentList to add/remove new items, since studentList is not binded with mAdapter your changes doesn't reflect in the UI.

Fix: Declare temArray as a class level variable and use temArray to manipulate the items.

 //class variable
 private ArrayList temArray = new ArrayList();

 handler.postDelayed(new Runnable() {
            @Override public void run() {
              //   remove progress item
              temArray.remove(temArray.size() - 1);
              mAdapter.notifyItemRemoved(temArray.size());
              //add items one by one
              int start = temArray.size();
              int end = start + 10;
              if(end<=studentList.size()){
                temArray.addAll(studentList.subList(start,end));
              }   
              mAdapter.setLoaded();
            }
          }, 2000);