Android use Data Binding Library with CursorAdapter - android-cursoradapter

Question

I want to use the Android Data Binding Library with a ListView populated by a custom CursorAdapter, but I can't figure out how to get it work. I seems such a simple thing to achieve.
This is what I have now:
public class PlayCursorAdapter extends CursorAdapter {
private List<Play> mPlays;
PlayCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
mPlays = new ArrayList<>();
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
ListItemPlayBinding binding = ListItemPlayBinding.inflate(LayoutInflater.from(context), parent, false);
Play play = new Play();
binding.setPlay(play);
mPlays.add(play);
return binding.getRoot();
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
int timeIndex = cursor.getColumnIndexOrThrow(PlayEntry.COLUMN_TIME);
...
long time = cursor.getLong(timeIndex);
...
Play play = mPlays.get(cursor.getPosition());
play.setTime(time);
...
}
}
Current behaviour:
When I run this code and I scroll down in the list I get a IndexOutOfBoundsException on the mPlays list.
Desired behaviour:
I want to populate a ListView with data from a ContentProvider using the Data Binding Library and a CursorAdapter. Is it even possible to use the Data Binding Library with a CursorAdapter? Or do you recommend to always use a RecyclerView and a RecyclerView.Adapter?

Answer 1

You should be able to avoid the problem by eliminating the mPlays list:
public class PlayCursorAdapter extends CursorAdapter {
PlayCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
}
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
ListItemPlayBinding binding = ListItemPlayBinding.inflate(LayoutInflater.from(context), parent, false);
Play play = new Play();
binding.setPlay(play);
return binding.getRoot();
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
int timeIndex = cursor.getColumnIndexOrThrow(PlayEntry.COLUMN_TIME);
...
long time = cursor.getLong(timeIndex);
...
ListItemPlayBinding binding = DataBindingUtil.getBinding(view);
Play play = binding.getPlay();
play.setTime(time);
...
}
}
This assumes you don't just want to instantiate a new Play each time you bindView().