ListView custom filter gives wrong item selected when filtered [Android]

Question

I am new to Android programming and I have a ListView when filtered always return me the first item in the list, so how do I fix this?

For instance, my list contains

Answer 1

Because you filter your adapter to have B.C in position 0 and B.D in position 1. But in your implementation of your onClickListener, you use the listview's position to get directly from the source ArrayList.

String a = patientArrayList.get(position);

Instead to get it from the filtered adapter:

String a = parent.getAdapter().getItem(position);

or

String a = parent.getItemAtPosition(position);