Useful tips

How do I refresh my Android Adapter?

How do I refresh my Android Adapter?

To refresh the ListView in Android, call notifyDataSetChanged() method on the Adapter that has been set with the ListView. Also note that the method notifyDataSetChanged() has to be called on UI thread.

How do I refresh my RecyclerView Adapter?

How to update RecyclerView Adapter Data

  1. Update the ArrayList from the fragment where recyclerView is created, set new data to adapter, and then call adapter.
  2. Create a new adapter, as others did, and it worked for them, but there wasn’t any change for me: recyclerView.setAdapter(new RecyclerViewAdapter(newArrayList))

Why is notifyDataSetChanged not working?

One of the main reasons notifyDataSetChanged() won’t work for you – is, Your adapter loses reference to your list. When you first initialize the Adapter it takes a reference of your arrayList and passes it to its superclass.

What does notifyDataSetChanged do in RecyclerView?

notifyDataSetChanged. Notify any registered observers that the data set has changed. There are two different classes of data change events, item changes and structural changes. Item changes are when a single item has its data updated but no positional changes have occurred.

How to refresh adapter / listview on Android Stack Overflow?

If nothing works, just create the adapter instance again with the new set of results or the updated set of results. Then you can see the new view. Perhaps their problem is the moment when the search is made in the database. In his Fragment Override cycles of its to figure out just: try testing with the methods:

What’s the best way to refresh the adapter?

Should we also be declaring the variables for the Cursors, DatabaseHelpers and Adapter in the Class (outside of the OnCreate) so that they are accessible to all the functions? I realise this is just poor programming at this stage, but Im trying to get some pointers as to the best way of doing things. You should use adapter.notifyDataSetChanged ().

Why is my Android listadapter not updating?

This is by design as otherwise the provided DiffUtil.ItemCallback * could never work – the [ListAdapter] must have the previous list if items to compare new * ones to using provided diff callback. * However, it’s very convenient to call [ListAdapter.submitList] with the same list and expect * the view to be updated.

Why is notifydatasetchanged ( ) not working in Android?

Because you have changed the data but the view isn’t refresh and notifydatasetchanged () reload the content of the view (ListView/GridView/Gallery…) For a good practice and understand correctly I recommend to you to use a ‘custom adapter’ using ‘ baseAdapter ‘