javaandroidlistviewadaptor

Retrieving ListView to Adaptor across classes

I am trying to add items to a ListView/Adapter from my MainActivity and use it across ListHelper.

I have it declared in Registrant.

public static List<Registrant> searchList = new ArrayList<Registrant>();

And then I add to it from MainActivity..

Registrant.searchList.add(registrant);

Then I try to retrieve this into a listview from the ListHelper.

ListView listView = (ListView) findViewById(R.id.list);
listView.setAdapter(adapter);
adapter = new CustomListAdapter(this, Registrant.searchList);
adapter.notifyDataSetChanged();

But no luck, it is a blank screen?

Any ideas would be helpful.. thank you!

Solution

  • Instead of creating object of CustomListAdapter class for updating data in ListView data-source. create a method in CustomListAdapter class for adding data in List which is used by Adapter as data-source :

    In CustomListAdapter class add following method:

    public void addItems(){
   arrList.addAll(Registrant.searchList);
   this.notifyDataSetChanged();
}

    Now call addItems method when want to update data in ListView:

    listView.setAdapter(adapter); 
adapter.addItems();