Remove all items from RecyclerView

Question

I am trying to remove all the elements from my RecyclerView in my onRestart method so the items don't get loaded twice:

@Override protected void onRestart() {     super.onRestart();      // first clear the recycler view so items are not populated twice     for (int i = 0; i < recyclerAdapter.getSize(); i++) {         recyclerAdapter.delete(i);     }      // then reload the data     PostCall doPostCall = new PostCall(); // my AsyncTask...      doPostCall.execute(); } 

But for some reason the delete method I created in the adapter is not functioning properly:

in RecyclerAdapter.java:

public void delete(int position){     myList.remove(position);     notifyItemRemoved(position); }  public int getSize(){     return myList.size(); } 

I think every other item in my list gets deleted instead of the entire list.

With a listview it was so easy and I simply called adapter.clear().

Can someone please help me fix up the code?

I think I should be using notifyItemRangeRemoved(...,...); but I am not sure how. TIA

Answer 1

This works great for me:

public void clear() {     int size = data.size();     if (size > 0) {         for (int i = 0; i < size; i++) {             data.remove(0);         }          notifyItemRangeRemoved(0, size);     } } 

Source: https://github.com/mikepenz/LollipopShowcase/blob/master/app/src/main/java/com/mikepenz/lollipopshowcase/adapter/ApplicationAdapter.java

or:

public void clear() {     int size = data.size();     data.clear();     notifyItemRangeRemoved(0, size); } 

For you:

@Override protected void onRestart() {     super.onRestart();      // first clear the recycler view so items are not populated twice     recyclerAdapter.clear();      // then reload the data     PostCall doPostCall = new PostCall(); // my AsyncTask...      doPostCall.execute(); }