Beating the Fragmentation Monster: Listing 3

TitlesFragment.cs.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Util;
using Android.Views;
using Android.Widget;
using Android.Support.V4.App;
namespace com.wallym.sample.fragmentexample
{
    public class TitlesFragment : Android.Support.V4.App.ListFragment
    {
        int _currentPlayId;
        bool _isDualPane;
        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            // Create your fragment here
        }
        public override void OnActivityCreated(Bundle savedInstanceState)
        {
            base.OnActivityCreated(savedInstanceState);
            var adapter = new ArrayAdapter(Activity, Android.Resource.Layout.SimpleListItemChecked, StarTrek.Character);
            ListAdapter = adapter;
            if (savedInstanceState != null)
            {
                _currentPlayId = savedInstanceState.GetInt("current_play_id", 0);
            }
            var detailsFrame = Activity.FindViewById(Resource.Id.details);
            _isDualPane = detailsFrame != null && detailsFrame.Visibility == ViewStates.Visible;
            if (_isDualPane)
            {
                ListView.ChoiceMode = ChoiceMode.Single;
                ShowDetails(_currentPlayId);
            }
        }
        public override void OnListItemClick(ListView l, View v, int position, long id)
        {
            ShowDetails(position);
        }
        private void ShowDetails(int playId)
        {
            _currentPlayId = playId;
            if (_isDualPane)
            {
                // We can display everything in place with fragments.
                // Have the list highlight this item and show the data.
                ListView.SetItemChecked(playId, true);
                // Check what fragment is shown, replace if needed.
                var details = FragmentManager.FindFragmentById(Resource.Id.details) as DetailsFragment;
                if (details == null || details.ShownPlayId != playId)
                {
                    // Make new fragment to show this selection.
                    details = DetailsFragment.NewInstance(playId);
                    // Execute a transaction, replacing any existing
                    // fragment with this one inside the frame.
                    var ft = FragmentManager.BeginTransaction();
                    ft.Replace(Resource.Id.details, details);
                    ft.SetTransition(FragmentTransaction.TransitFragmentFade);
                    ft.Commit();
                }
            }
            else
            {
                // Otherwise we need to launch a new Activity to display
                // the dialog fragment with selected text.
                var intent = new Intent();
                intent.SetClass(Activity, typeof(DetailsActivity));
                intent.PutExtra("current_play_id", playId);
                StartActivity(intent);
            }
        }
    }
}

About the Author

Wallace (Wally) B. McClure has authored books on iPhone programming with Mono/Monotouch, Android programming with Mono for Android, application architecture, ADO.NET, SQL Server and AJAX. He's a Microsoft MVP, an ASPInsider and a partner at Scalable Development Inc. He maintains a blog, and can be followed on Twitter.

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