Question

I have set up custom horizontal paging in my app with lets say 5 pages. Each page has its own ListView and ListView Adapter. In my main Activity class, I have an ArrayList of custom objects that I use to hydrate each ListView.

So in my main class, I can call:

lvAdapter.setItems(items);

Works fine.

But when I call:

lvAdapter.clearItems();

I only want it to clear the items in the ListView, but it actually removes all the items from my ArrayList for that object. I suppose the Adapter is only holding a reference?

Adapter clearItems:

public void clearItems()
{
      this.items.clear();  //this will remove the object in the ArrayList
      this.notifyDataSetChanged();
}

What I am trying to do is setItems on actively visible pages and clearItems for those pages that are not visible. Because I am dealing with out of memory crashes when I load all the pages at once…

Answer 1

You could clear the adapter reference for that ListView e.g. listView.setAdapter(null)

I would also read up on efficient Adapter implementations, there are several things you can do to reduce memory footprint e.g. recycling views properly in getView(...)