Question

I have a Sherlock Tab Navigation implemented as the following two classes. Class Dashboard is the main activity. Class DashboardContacts represents one of the tab’s fragment.

I am loading HTTP data that gets loaded in a while and when it loads I need the list view in DashboardContacts to reflect the changes brought in from Server and refresh the ListView from blank to filled list. For this i’m calling notifyDataSetChanged method through refresh method in DashboardContacts, but no change relects in ListView until I change the tabs.

public class Dashboard extends SherlockFragmentActivity {

    private DashboardContacts contactsTab=new DashboardContacts();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dashboard);

        getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        ActionBar.Tab tab = getSupportActionBar().newTab();
        tab.setText(getResources().getStringArray(R.array.dashboardTabs)[0]);
        tab.setTabListener(new DashboardHome());
        getSupportActionBar().addTab(tab);

        ActionBar.Tab tab2 = getSupportActionBar().newTab();
        tab2.setText(getResources().getStringArray(R.array.dashboardTabs)[1]);
        tab2.setTabListener(contactsTab);
        getSupportActionBar().addTab(tab2);

        //CALLS ASYNCLOADER HERE TO LOAD HTTP DATA
    }

    private void httpSuccessMethod() {
        //Does some work and then calls:
        contactsTab.refresh(datasource.getAllContacts());

    }

Here is the DashboardContacts class layout:

public class DashboardContacts extends SherlockListFragment  implements ActionBar.TabListener{

    private UserListAdapter listAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        listAdapter=new UserListAdapter(container.getContext(), ApplicationState.getInstance(container.getContext()).getUserCache());
        setListAdapter(listAdapter);
        return super.onCreateView(inflater, container, savedInstanceState);
    }

    @Override
    public void onStart() {
        super.onStart(); 
    }


    @Override
    public void onTabSelected(Tab tab,android.support.v4.app.FragmentTransaction ft) {
        ft.replace(android.R.id.content, this,"contacts");
        ft.attach(this);
    }

    @Override
    public void onTabUnselected(Tab tab,android.support.v4.app.FragmentTransaction ft) {
        ft.detach(this);

    }

    @Override
    public void onTabReselected(Tab tab,android.support.v4.app.FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }


        public void refresh(List<User> list) {
        if(this.listAdapter != null) {
        this.listAdapter.setList(list);
        this.listAdapter.notifyDataSetChanged();
    }
}

The refresh method in the custom list adapter looks like, so I am actually changing the data there too:

public void refresh(List<User> list) {
    if(this.listAdapter != null) {
        this.listAdapter.setList(list);
        this.listAdapter.notifyDataSetChanged();
    }

Answer 1

I think this is something I didn’t implement, so I did it now and solved the issue:

public void setList(List<ExpensePool> list) {
    clear();
    addAll(list);
    notifyDataSetChanged();
}