Force tab content to update after async task completes

I have TabActivitywith 3 tabs. There is an asynchronous task, which, when launched, by clicking on the menu item for updating, retrieves the updated data from the server. This data is stored in the controller and is accessible to all views, so the model should be loaded only once.

My problem is that after starting the async operation and updating the model, how can I signal all three tabs to update my content?

My activity

public class DashboardActivity extends TabActivity {
    private ProfileModel profile;
    private TabHost tabHost;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        profile = Controller.getProfile();

        this.setContentView(R.layout.dashboard);

        tabHost = getTabHost();
        setupTab(new TextView(this), "Home", new Intent().setClass(DashboardActivity.this, HomeActivity.class));
        setupTab(new TextView(this), "History", new Intent().setClass(DashboardActivity.this, PaymentsActivity.class));
        setupTab(new TextView(this), "My Wallet", new Intent().setClass(DashboardActivity.this, MyWalletActivity.class));

        tabHost.setCurrentTab(0);

        ActionBar actionBar = (ActionBar)findViewById(R.id.actionbar);
        actionBar.setTitle(profile.Name);

    }

    private void setupTab(final View view, final String tag, Intent content) {
        View tabview = createTabView(tabHost.getContext(), tag);
            TabSpec setContent = tabHost.newTabSpec(tag)
                .setIndicator(tabview)
                .setContent(content);
            tabHost.addTab(setContent);
    }

    private static View createTabView(final Context context, final String text) {
        View view = LayoutInflater.from(context).inflate(R.layout.tabs_bg, null);
        TextView tv = (TextView) view.findViewById(R.id.tabsText);
        tv.setText(text);
        return view;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.mainmenu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.menu_settings:

            return true;
        case R.id.menu_refresh:
            new RefreshDashboardTask().execute();
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }


    private class RefreshDashboardTask extends AsyncTask<Void, Void, Void> {
        @Override
        protected void onPreExecute()
        {
            ActionBar actionBar = (ActionBar)findViewById(R.id.actionbar);

            if(actionBar != null)
                actionBar.setProgressBarVisibility(View.VISIBLE);
        }

        @Override
        protected Void doInBackground(Void... params) 
        {
            try {
                profile = DataHelper.getProfile();
                Controller.setProfile(profile);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (HttpException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (ServerException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result)
        {
            ActionBar actionBar = (ActionBar)findViewById(R.id.actionbar);

            if(actionBar != null)
                actionBar.setProgressBarVisibility(View.GONE);
        }
    }
}

EDIT . For further development, here is another code.

My controller

public class Controller extends Application {
    private static Controller instance;
    private static DefaultHttpClient client;
    private static ProfileModel profile;

    public Controller() {
        instance = this;
        client = new DefaultHttpClient();
        profile = null;
    }

    public static Context getContext() {
        return instance;
    }

    public static DefaultHttpClient getHttpContext() {
        return client;
    }

    public static ProfileModel getProfile() {
        return profile;
    }

    public static void setProfile(ProfileModel profile) {
        Controller.profile = profile;
    }

    @Override
    public void onCreate() 
    {
        super.onCreate();

    }
}

, . , . - 2 , , - , .

public class PaymentsActivity extends Activity {
    ProfileModel profile;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        this.setContentView(R.layout.payment_history);

        profile = Controller.getProfile();

        ListView itemList = (ListView)this.findViewById(R.id.payment_history_list);
        itemList.setTextFilterEnabled(true);
        itemList.clearChoices();
        itemList.setAdapter(new ItemSummaryAdapter(PaymentsActivity.this, R.layout.list_item_payment, profile.Items));
        //statementList.setOnItemClickListener(clickListener);
    }
}

, . .