Confirmation and undo removing in RecyclerView

Question

I have got a list of simple items in RecyclerView. Using ItemTouchHelper it was very easy to implement \"swipe-to-delete\" behavior.

public class TripsAdapte         


        

Answer 1

I've figured out much simpler way to do a deletion confirmation dialog working:

@Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
            int itemPosition = viewHolder.getAdapterPosition();

            new AlertDialog.Builder(YourActivity.this)
                    .setMessage("Do you want to delete: \"" + mRecyclerViewAdapter.getItemAtPosition(itemPosition).getName() + "\"?")
                    .setPositiveButton("Delete", (dialog, which) -> mYourActivityViewModel.removeItem(itemPosition))
                    .setNegativeButton("Cancel", (dialog, which) -> mRecyclerViewAdapter.notifyItemChanged(itemPosition))
                    .setOnCancelListener(dialogInterface -> mRecyclerViewAdapter.notifyItemChanged(itemPosition))
                    .create().show();
        }

Note that:

• deletion is delegated to ViewModel which updates the mRecyclerViewAdapter upon success.
• for the item to "return" you just have to call mRecyclerViewAdapter.notifyItemChanged
• cancelListener and negativeButtonListener perform the same thing. You can opt to use .setCanclable(false) if you don't want the user to tap outside the dialog