RecyclerView decorator adding extra padding on refresh

Question

So, I\'m facing a weird problem while implementing RecyclerView in my project. I have a custom decorator to implement a consistent top and bottom padding and a rather different

Answer 1

This is happening because we are trying to add itemDecorator to the recycler view which already have itemDecorator added to it, check first if its already there then don't add again

if (0 == recyclerview.getItemDecorationCount()) {
recyclerview.addItemDecoration(new DividerItemDecoration(ContextCompat.getDrawable(getActivity(), R.drawable.divider)));
}

This 0 will be the number of itemDecorator we have in recycler view, most of the time it'll be 0.

Answer 2

Apparently you are adding various decorations. I was having the same problem. What I did here and that worked out was:

1º - Declare the decoration before the onCreate () method:

public StickyHeaderDecoration mDecor;
public MyAdapterPinned MyAdapterPinned;

2º - Then I created a method that creates and populates my recycleview. In this method I check if I have already called mDecor. If so, I remove it. Otherwise, I create it. The code looks like this:

public void createRecyclerView(){
    //hide layout com progress
    hideLayoutProgressFull();

    LinearLayoutManager mLayoutManager = new 
    LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
    recyclerView.setLayoutManager(mLayoutManager);

    recyclerView.setItemAnimator(new DefaultItemAnimator());

    myAdapterPinned = new MyAdapterPinned(getContext(), mList);

    recyclerView.setAdapter(myAdapterPinned);

    if (mDecor != null)
        recyclerView.removeItemDecoration(mDecor);

    mDecor = new StickyHeaderDecoration(myAdapterPinned);
    recyclerView.addItemDecoration(mDecor);

    //hide progressDialog
    hideProgress();
}    

NOTE: I am using an adapter that sets the title to each change but you can not interfere with the result. You can use your ordinary adapter. It worked for me. I hope it works for you too;