13 - notixamarin - tabs.txt

gist tabs

// newsListActivity.cs

[Activity(Label = "NotiXamarin", MainLauncher = true, LaunchMode = Android.Content.PM.LaunchMode.SingleTop)]
    public class NewsListActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
           
            // Create your application here
            SetContentView(Resource.Layout.NewsList);

            ActionBar.NavigationMode = ActionBarNavigationMode.Tabs;

            AddTab("All news", new AllNewsListFragment());
            AddTab("Saved news", new SavedNewsListFragment());
        }

        private void AddTab(string tabTitle, Fragment fragment)
        {
            var tab = ActionBar.NewTab();
            tab.SetText(tabTitle);

            tab.TabSelected += delegate (object sender, ActionBar.TabEventArgs e)
            {
                var previousFragment = FragmentManager.FindFragmentById(Resource.Id.newsListFragmentContainer);
                if (previousFragment != null)
                {
                    e.FragmentTransaction.Remove(previousFragment);
                }
                e.FragmentTransaction.Add(Resource.Id.newsListFragmentContainer, fragment);
            };

            tab.TabUnselected += delegate (object sender, ActionBar.TabEventArgs e)
            {
                e.FragmentTransaction.Remove(fragment);
            };

            ActionBar.AddTab(tab);
        }

// BaseNewsListFragment

public class BaseNewsListFragment: Fragment
    {
        protected ListView _newsListView;
        protected List<News> _news;

        public BaseNewsListFragment()
        {
            _news = new List<News>();
        }

        protected void SetupFragment()
        {
            SetupViews();

            SetupEvents();

            _newsListView.Adapter = new NewsListAdapter(Activity, _news);
        }

        protected void SetupViews()
        {
            _newsListView = View.FindViewById<ListView>(Resource.Id.newsListView);
        }

        protected void SetupEvents()
        {
            _newsListView.ItemClick += NewsListView_ItemClick;
        }


        private void NewsListView_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
        {
            var intent = new Intent(Activity, typeof(MainActivity));
            var id = (int)e.Id;
            intent.PutExtra(MainActivity.KEY_ID, id);
            StartActivity(intent);
        }

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            return inflater.Inflate(Resource.Layout.NewsListFragment, container, false);
        }
    }

// AllNewsListFragment

public class AllNewsListFragment: BaseNewsListFragment
    {
        private NewsService _newsService;

        public AllNewsListFragment()
        {
            _newsService = new NewsService();
        }

        public override void OnActivityCreated(Bundle savedInstanceState)
        {
            base.OnActivityCreated(savedInstanceState);

            if (!_news.Any())
            {
                _news = _newsService.GetNews();
            }

            SetupFragment();
        }
    }

    // SavedNewsListFragment

    public class SavedNewsListFragment : BaseNewsListFragment
    {
        private NewsLocalService _newsLocalService;

        public SavedNewsListFragment()
        {
            _newsLocalService = new NewsLocalService();
        }

        public override void OnActivityCreated(Bundle savedInstanceState)
        {
            base.OnActivityCreated(savedInstanceState);

            _news = _newsLocalService.GetAllSavedForReadLater();

            SetupFragment();
        }
    }