Merge branch 'random_but_working'

NuGet.Config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+  </packageSources>
+</configuration>

QuickPlay.sln

@@ -5,10 +5,13 @@ VisualStudioVersion = 16.0.31112.23
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuickPlay", "QuickPlay\QuickPlay.csproj", "{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MpcCore", "..\..\Third-party\mpcCore\src\MpcCore\MpcCore.csproj", "{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
+		Release-Stable|Any CPU = Release-Stable|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -17,6 +20,15 @@ Global
 		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release|Any CPU.Build.0 = Release|Any CPU
 		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release|Any CPU.Deploy.0 = Release|Any CPU
+		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release-Stable|Any CPU.ActiveCfg = Release|Any CPU
+		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release-Stable|Any CPU.Build.0 = Release|Any CPU
+		{FDBCCBF8-7CA5-4719-8CBB-8E33C464B27C}.Release-Stable|Any CPU.Deploy.0 = Release|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Release-Stable|Any CPU.ActiveCfg = Release|Any CPU
+		{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}.Release-Stable|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

QuickPlay/Configuration.cs

@@ -1,42 +1,211 @@
 using System;
+using System.Net.Http;
 using System.IO;
+using System.Threading.Tasks;
+using System.Collections.Generic;
 
-namespace QuickPlayer
+namespace QuickPlay
 {
+#pragma warning disable CS0659 // This is basically an almost-singleton, which will never be put in any hash table.
     /// <summary>
     /// Application (global) configuration data class
     /// </summary>
-    class AppConfiguration
+    [Serializable]
+    public sealed class AppConfiguration
     {
+        // XXX: All the fields need to be checked in overriden Equals method
+        // Also: sensible defaults should be provided in defaultConfiguration field
+        public string playerConfigUrl;
+
+        // XXX: Any other fields of this model need [NonSerialized] attribute
+        [NonSerialized]
+        public static readonly string configFilePath = 
+            Path.Combine(
+                System.Environment.GetFolderPath(System.Environment.SpecialFolder.ApplicationData), 
+                "appConfig.xml"
+            );
+        public static AppConfiguration loadConfiguration()
+        {
+            var cfg = loadSavedConfiguration();
+            if (cfg == null)
+            {
+                cfg = defaultConfiguration;
+            }
+            return cfg;
+        }
+        public static AppConfiguration loadSavedConfiguration()
+        {
+            var serializer = new System.Xml.Serialization.XmlSerializer(typeof(AppConfiguration));
+            AppConfiguration result = null;
+            try
+            {
+                using (var stream = new System.IO.FileStream(configFilePath, System.IO.FileMode.Open))
+                {
+                    result = (AppConfiguration)serializer.Deserialize(stream);
 
                 }
+            } catch (FileNotFoundException)
+            {
+                // This is fine, we will return null anyway.
+            } catch (InvalidCastException) {
+                // This is not so much fine, TODO log it.
+                // Still, we cannot supply config, so treat it as if it does not exist.
+            }
+            return result;
+        }
+
+        public void saveConfiguration()
+        {
+            // First we save the config
+            var serializer = new System.Xml.Serialization.XmlSerializer(typeof(AppConfiguration));
+            using (var stream = new System.IO.FileStream(configFilePath, System.IO.FileMode.Create))
+            {
+                serializer.Serialize(stream, this);
+            }
+
+            // Make sure that the configuration is same
+            var newConfig = AppConfiguration.loadSavedConfiguration();
+            if (this != newConfig) throw new InvalidDataException("Saved configuration is different from the supplied one.");
+        }
+
+        [NonSerialized]
+        public static readonly AppConfiguration defaultConfiguration = new AppConfiguration
+        {
+            playerConfigUrl = "http://www.ms.mff.cuni.cz/~turinskp/znelky.ini",
+        };
+        public async Task<PlayerConfiguration> GetPlayerConfig()
+        {
+            IPlayerConfigurationProvider cfgProvider;
+            if (playerConfigUrl.StartsWith("http:") || playerConfigUrl.StartsWith("https:"))
+            {
+                cfgProvider = new HttpConfigurationProvider(playerConfigUrl);
+            } else if (playerConfigUrl.StartsWith("file://"))
+            {
+                string filename = playerConfigUrl.Substring("file://".Length);
+                var reader = new StreamReader(filename);
+                cfgProvider = new FileConfigurationProvider(reader);
+            } else if (playerConfigUrl == "default") {
+                cfgProvider = new DummyConfigurationProvider();
+            } else
+            {
+                throw new InvalidOperationException("Schema of player config URL not supported");
+            }
+            PlayerConfiguration playercfg;
+            try
+            {
+                playercfg = await cfgProvider.GetConfigurationAsync();
+            }
+            // FIXME: These are provider-specific exceptions!
+            catch (Exception e) when (
+                e is Java.Net.UnknownHostException 
+                || e is OperationCanceledException 
+                || e is HttpRequestException 
+                || e is System.Net.WebException
+                )
+            {
+                var ctx = Android.App.Application.Context;
+                var t = Android.Widget.Toast.MakeText(ctx, "Could not load config:" + e.Message, Android.Widget.ToastLength.Long);
+                t.Show();
+                cfgProvider = new DummyConfigurationProvider();
+                playercfg = await cfgProvider.GetConfigurationAsync();
+            }
+            return playercfg;
+        }
+
+        // We want to compare by values.
+        // It might actually be a bit more sensible to compare serialized
+        // versions of the objects, but that seems unneccessarily hard.
+        public override bool Equals(object obj)
+        {
+            var other = (AppConfiguration)obj;
+            // These fields have to match...
+            if (this.playerConfigUrl != other.playerConfigUrl) return false;
+            return true;
+        }
+    }
+#pragma warning restore CS0659
+
+    public enum PlayerType
+    {
+        MPD,
+    }
 
     /// <summary>
     /// Configuration of the player.
     /// 
     /// Contains details about connection, configured songs &c.
     /// </summary>
-    class PlayerConfiguration
+    public class PlayerConfiguration
     {
+        public Dictionary<string, IPlayable> songs = new Dictionary<string, IPlayable>();
+        public string playerName = "";
+        public PlayerType playerType;
+        public string playerConnectionDetails = ""; // This is opaque to this class, the player will make sense of it.
+
         public static PlayerConfiguration FromFile(StreamReader reader)
         {
-            return null; // FIXME: Implement
+            var parser = new IniParser(reader);
+            var ini = parser.Parse();
+            var result = new PlayerConfiguration();
+            foreach (var elem in ini)
+            {
+                // Two options: either general options, or song descriptions
+                if (elem.Key == "general")
+                {
+                    result.playerName = elem.Value["name"];
+                    result.playerType = PlayerType.MPD; //FIXME: not always.
+                    result.playerConnectionDetails = elem.Value["connection"];
+                } else
+                {
+                    var song = new Song(elem.Key, elem.Value);
+                    result.songs[elem.Key] = song;
+                }
             }
+            return result;
         }
 
-    interface IPlayerConfigurationProvider
+        public IPlayer GetPlayer()
+        {
+            IPlayer result;
+            switch (playerType)
             {
-        PlayerConfiguration GetConfiguration();
+                case PlayerType.MPD:
+                    result = new MpdPlayer(this);
+                    break;
+                default:
+                    throw new InvalidOperationException("Cannot happen: Player had no type.");
+            }
+            return result;
+        }
     }
 
-    sealed class NetworkConfigurationProvider : IPlayerConfigurationProvider
+    interface IPlayerConfigurationProvider
     {
+        Task<PlayerConfiguration> GetConfigurationAsync();
+    }
 
+    sealed class HttpConfigurationProvider : IPlayerConfigurationProvider
+    {
+        readonly string configUrl;
+        public HttpConfigurationProvider(string url)
+        {
+            configUrl = url;
+        }
+        public async Task<PlayerConfiguration> GetConfigurationAsync()
+        {
+            return await Task.Run(async () =>
+            {
+                var client = new HttpClient();
+                var resp = await client.GetStreamAsync(configUrl);
+                var sr = new StreamReader(resp);
+                return PlayerConfiguration.FromFile(sr);
+            });
+        }
     }
 
     sealed class FileConfigurationProvider : IPlayerConfigurationProvider
     {
-        public readonly StreamReader reader;
+        StreamReader reader;
         public FileConfigurationProvider(StreamReader reader)
         {
             this.reader = reader;
@@ -46,14 +215,36 @@ namespace QuickPlayer
         {
             this.reader = new StreamReader(filename);
         }
-        public PlayerConfiguration GetConfiguration()
+        public Task<PlayerConfiguration> GetConfigurationAsync()
         {
-            return PlayerConfiguration.FromFile(reader);
+            return Task.FromResult(PlayerConfiguration.FromFile(reader));
         }
     }
 
     sealed class DummyConfigurationProvider : IPlayerConfigurationProvider
     {
-        public PlayerConfiguration GetConfiguration() => null;
+        public Task<PlayerConfiguration> GetConfigurationAsync()
+        {
+            PlayerConfiguration cfg = new PlayerConfiguration();
+            cfg.playerType = PlayerType.MPD;
+            cfg.playerName = "Dummy player";
+            cfg.playerConnectionDetails = "127.0.0.1";
+
+            return Task.FromResult(cfg);
+        }
+    }
+
+    class Song: IPlayable
+    {
+        public string Identifier { get; private set;  }
+        public PlayableMetadata Metadata { get; private set; }
+        public Song(string id, Dictionary<string, string> data) {
+            Identifier = id;
+            Metadata = new PlayableMetadata
+            {
+                usualPlayingTime = TimeSpan.Parse(data["time"]),
+                filePath = data["path"],
+            };
+        }
     }
 }

QuickPlay/IniParser.cs

@@ -0,0 +1,67 @@
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using System;
+using System.IO;
+using System.Collections.Generic;
+using System.Text;
+
+namespace QuickPlay
+{
+    /// <summary>
+    /// This class implements (yet another) INI-style parser.
+    /// 
+    /// INI specification: everything is in sections, comments using both '#'
+    /// or ';', space around '=' is trimmed, last value assigned overrides
+    /// previous assignments, sections may not repeat. Section names may only
+    /// contain reasonable characters (at least [a-zA-Z0-9. ], not really
+    /// enforced). Everything is case-sensitive.
+    ///
+    /// Both CRLF and just LF should be supported as line ends.
+    /// </summary>
+    class IniParser
+    {
+        StreamReader reader;
+        string currentSection = null;
+        public IniParser(StreamReader sr)
+        {
+            reader = sr;
+        }
+
+        // The return type is dictionary by sections, which in turn holds the section key-value dictionary
+        // Maybe the code is a bit more Pythonic than it should be...
+        public Dictionary<string, Dictionary<string, string>> Parse()
+        {
+            Dictionary<string, Dictionary<string, string>> result = new Dictionary<string, Dictionary<string, string>>();
+            while (!reader.EndOfStream)
+            {
+                var line = reader.ReadLine();
+                line = StripComments(line).Trim();
+                if (line.Length == 0) continue;
+                if (line.StartsWith('['))
+                {
+                    // This does not really do the right thing, but for QuickPlay's use it is good enough.
+                    currentSection = line.Split(new char[] { '[', ']' })[1];
+                    if (result.ContainsKey(currentSection)) throw new InvalidOperationException("Multiple sections with same name");
+                    result[currentSection] = new Dictionary<string, string>();
+                }
+                else
+                {
+                    // Other lines may only be assignments
+                    int equalSignPosition = line.IndexOf('=');
+                    string key = line.Substring(0, equalSignPosition).Trim();
+                    string value = line.Substring(equalSignPosition + 1).Trim();
+                    result[currentSection][key] = value;
+                }
+            }
+            return result;
+        }
+        string StripComments(string line)
+        {
+            return line.Split(new char[] { ';', '#' })[0];
+        }
+    }
+}

QuickPlay/Interfaces.cs

@@ -1,44 +1,65 @@
 using System;
 using System.Collections.Generic;
+using System.Threading.Tasks;
 
 // MPD client abstractions and simplifications
-namespace QuickPlayer
+namespace QuickPlay
 {
     /// <summary>
     /// Simplified abstraction of possible players. Only methods needed are included.
     ///
     /// That means that the interface may be extended in the future, which is sad.
     /// </summary>
-    interface IPlayer
+    public interface IPlayer
     {
-        void Play(string identifier);
+        public enum PlayerStatus
+        {
+            Disconnected, Playing, Stopped
+        }
+        Dictionary<string, IPlayable> Songs { get; }
+        string PlayerName { get; }
+        Task Play(IPlayable playable);
         float CurrentProgress { get; }
-        bool IsReady { get; }
+        PlayerStatus Status { get; }
-        void SetReasonableOptions(); //TODO
+        Task SetReasonableOptions();
+        /// <summary>
+        /// Attach to the real player.
+        /// 
+        /// Since this operation can be asynchronous, we cannot put it in th 
+        /// constructor. And this allows for some tweaks before connecting. 
+        /// </summary>
+        /// <returns></returns>
+        Task ConnectAsync();
     }
     /// <summary>
     /// A simple dataclass to hold auxiliary data of the Playable objects.
     /// </summary>
     // This is not really an interface, but since it is a dataclass, I treat it
     // more as a part of interface, so it belongs to this file.
-    class PlayableMetadata
+
+    // Also, in order not to need boilerplate code, this should be semantically
+    // treated as immutable even though it's not.
+    public class PlayableMetadata
     {
-        public readonly TimeSpan usualPlayingTime;
+        public TimeSpan usualPlayingTime;
+        public string filePath;
     }
 
-    interface IPlayable
+    public interface IPlayable
     {
-        void Play();
         string Identifier { get; }
         PlayableMetadata Metadata { get; }
     }
-    interface ILayout
+    interface ILayoutStrategy
     {
-        // TODO
+        List<IPlayable> LayOut(ICollection<IPlayable> playables);
     }
-    interface ILayoutStrategy
+
+    public class CannotConnectException: Exception
     {
-        ILayout LayOut(ICollection<IPlayable> playables);
+        public CannotConnectException(string msg, Exception e) : base(msg, e) { }
+        public CannotConnectException(string msg) : base(msg) { }
+        public CannotConnectException() : base() { }
     }
 
 }

QuickPlay/LayoutStrategies.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+
+namespace QuickPlay
+{
+    class LexicographicLayoutStrategy : ILayoutStrategy
+    {
+        public List<IPlayable> LayOut(ICollection<IPlayable> playables)
+        {
+            List<IPlayable> list = new List<IPlayable>(playables);
+            list.Sort((IPlayable x, IPlayable y) => x.Identifier.CompareTo(y.Identifier));
+            return list;
+        }
+    }
+}

QuickPlay/MainActivity.cs

@@ -1,60 +1,139 @@
 using System;
 using Android.App;
 using Android.OS;
-using Android.Runtime;
 using Android.Views;
-using AndroidX.AppCompat.Widget;
+using Android.Widget;
-using AndroidX.AppCompat.App;
+using Android.Support.V7.App;
-using Google.Android.Material.FloatingActionButton;
+using Toolbar = Android.Support.V7.Widget.Toolbar;
-using Google.Android.Material.Snackbar;
+using GridLayoutManager = Android.Support.V7.Widget.GridLayoutManager;
 
 namespace QuickPlay
 {
-    [Activity(Label = "@string/app_name", Theme = "@style/AppTheme.NoActionBar", MainLauncher = true)]
+    [Activity(Label = "@string/app_name", Theme = "@style/AppTheme", MainLauncher = true)]
     public class MainActivity : AppCompatActivity
     {
-        protected override void OnCreate(Bundle savedInstanceState)
+        private AppConfiguration appConfig;
+        private Android.Support.V7.Widget.RecyclerView recyclerView;
+        private IPlayer currentPlayer;
+
+        protected override async void OnCreate(Bundle savedInstanceState)
         {
             base.OnCreate(savedInstanceState);
-            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
+
+
+            // App initialization
+            appConfig = AppConfiguration.loadConfiguration();
+            var playerConfig = await appConfig.GetPlayerConfig();
+            currentPlayer = playerConfig.GetPlayer();
+            try
+            {
+                await currentPlayer.ConnectAsync();
+            } catch (CannotConnectException e)
+            {
+                //TODO: View a toast with details and change some colors?
+                var t = Toast.MakeText(this, e.Message + ": " + e.InnerException.Message ?? "", ToastLength.Long);
+                t.Show();
+            }
+
+            // UI initialization
             SetContentView(Resource.Layout.activity_main);
 
-            Toolbar toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
+            // UI Toolbar initialization
+            var toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
             SetSupportActionBar(toolbar);
+            SupportActionBar.Title = "My Toolbar";
+
+            // Hide the play bar by default
+            var bar = FindViewById(Resource.Id.currentSongBar);
+            bar.Visibility = ViewStates.Invisible;
 
-            FloatingActionButton fab = FindViewById<FloatingActionButton>(Resource.Id.fab);
+            // Initialize the RecyclerView
-            fab.Click += FabOnClick;
+            // Since this is rather complicated, it is in a separate method
+            InitializeRecyclerView();
+
+            // FIXME: This should be in OnResume...
+            // Refresh player info
+            OnPlayerUpdate();
+        }
+
+        private void InitializeRecyclerView()
+        {
+            recyclerView = FindViewById<Android.Support.V7.Widget.RecyclerView>(Resource.Id.recyclerView1);
+            var layoutStrategy = new LexicographicLayoutStrategy();
+            var adapter = new SongRecyclerAdapter(currentPlayer, layoutStrategy);
+            adapter.SongClick += OnSongClick;
+            recyclerView.SetAdapter(adapter);
+            var layoutManager = new GridLayoutManager(this, 2, GridLayoutManager.Vertical, false);
+            recyclerView.SetLayoutManager(layoutManager);
         }
 
         public override bool OnCreateOptionsMenu(IMenu menu)
         {
             MenuInflater.Inflate(Resource.Menu.menu_main, menu);
-            return true;
+            return base.OnCreateOptionsMenu(menu);
         }
 
         public override bool OnOptionsItemSelected(IMenuItem item)
         {
-            int id = item.ItemId;
+            if (item.ItemId == Resource.Id.action_settings)
-            if (id == Resource.Id.action_settings)
             {
-                return true;
+                // Show the play bar
+                var bar = FindViewById(Resource.Id.currentSongBar);
+                bar.Visibility = ViewStates.Visible;
             }
 
+            if (item.ItemId == Resource.Id.action_edit)
+            {
+                // Hide the play bar
+                var bar = FindViewById(Resource.Id.currentSongBar);
+                bar.Visibility = ViewStates.Invisible;
+            }
             return base.OnOptionsItemSelected(item);
         }
         
-        private void FabOnClick(object sender, EventArgs eventArgs)
+        /// <summary>
+        /// A callback for all player updates.
+        /// 
+        /// The update should be easy on resources, so no need to have separate
+        /// partial updates. This simply performs full update of the activity
+        /// state and views.
+        /// </summary>
+        public void OnPlayerUpdate()
+        {
+            TextView playerName = FindViewById<TextView>(Resource.Id.playerNameText);
+            playerName.Text = currentPlayer.PlayerName;
+            var bar = FindViewById(Resource.Id.currentSongBar);
+            switch (currentPlayer.Status)
             {
-            View view = (View) sender;
+                case IPlayer.PlayerStatus.Disconnected:
-            Snackbar.Make(view, "Replace with your own action", Snackbar.LengthLong)
+                    Toolbar tb = FindViewById<Toolbar>(Resource.Id.toolbar);
-                .SetAction("Action", (View.IOnClickListener)null).Show();
+                    tb.SetBackgroundColor(Android.Graphics.Color.Red);
+                    bar.Visibility = ViewStates.Invisible;
+                    break;
+                case IPlayer.PlayerStatus.Playing:
+                    ResetToolbarColor();
+                    // Show progress bar
+                    bar.Visibility = ViewStates.Visible;
+                    break;
+                case IPlayer.PlayerStatus.Stopped:
+                    ResetToolbarColor();
+                    bar.Visibility = ViewStates.Invisible;
+                    break;
             }
-
+        }
-        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
+        private void ResetToolbarColor()
         {
-            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+            Toolbar tb = FindViewById<Toolbar>(Resource.Id.toolbar);
+            tb.SetBackgroundColor(
+                new Android.Graphics.Color(
+                    Android.Support.V4.Content.ContextCompat.GetColor(this, Resource.Color.colorPrimary)
+                    )
+                );
+        }
 
-            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+        public async void OnSongClick(object sender, IPlayable song)
+        {
+            await currentPlayer.Play(song);
         } 
     }
 }

QuickPlay/MpdMonitorService.cs

@@ -0,0 +1,32 @@
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using System;
+
+namespace QuickPlay
+{  
+    [Service]
+    class MpdMonitorService : Service
+    {
+        public override void OnCreate()
+        {
+            base.OnCreate();
+            // TODO: Create the watching thread
+        }
+        public override IBinder OnBind(Intent intent)
+        {
+            throw new NotImplementedException();
+        }
+        public override bool OnUnbind(Intent intent)
+        {
+            return base.OnUnbind(intent);
+        }
+        public override void OnDestroy()
+        {
+            base.OnDestroy();
+        }
+    }
+}

QuickPlay/MpdPlayer.cs

@@ -0,0 +1,68 @@
+using Android.Content;
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using MpcCore;
+using System.Net.Sockets;
+
+namespace QuickPlay
+{
+    class MpdPlayer: IPlayer
+    {
+        MpcCoreClient mpd;
+        // MpcCore uses strings, so be it
+        string mpdIP, mpdPort;
+        public IPlayer.PlayerStatus Status { get; private set; }
+
+        public Dictionary<string, IPlayable> Songs { get; private set; }
+        public string PlayerName { get; private set; }
+        public float CurrentProgress { get {
+                throw new NotImplementedException();
+            } }        
+        public async Task Play(IPlayable song)
+        {
+            await mpd.SendAsync(new MpcCore.Commands.Player.Stop());
+            await SetReasonableOptions();
+            await mpd.SendAsync(new MpcCore.Commands.Queue.ClearQueue());
+            await mpd.SendAsync(new MpcCore.Commands.Queue.AddToQueue(song.Metadata.filePath));
+            await mpd.SendAsync(new MpcCore.Commands.Player.Play());
+        }
+        public async Task SetReasonableOptions()
+        {
+            await mpd.SendAsync(new MpcCore.Commands.Options.SetConsume(true));
+            await mpd.SendAsync(new MpcCore.Commands.Options.SetRandom(false));
+            await mpd.SendAsync(new MpcCore.Commands.Options.SetRepeat(false));
+            await mpd.SendAsync(new MpcCore.Commands.Options.SetSingle(false));
+        }
+        public MpdPlayer(PlayerConfiguration cfg)
+        {
+            // Populate known fields/properties
+            Songs = cfg.songs;
+            PlayerName = cfg.playerName;
+            // NOTE: We separate the port by '@', since ':' could be part of IPv6 and we do not want to complicate parsing.
+            var connDetails = cfg.playerConnectionDetails.Split('@');
+            if (connDetails.Length > 2) throw new InvalidOperationException("Bad connection details");
+            mpdIP = connDetails[0];
+            mpdPort = connDetails.Length >=2 ? connDetails[1] : "6600"; // XXX: Unneccessary default here...
+            // Connecting and monitoring remote player is done in ConnectAsync.
+            // Therefore, we start disconnected
+            Status = IPlayer.PlayerStatus.Disconnected;
+        }
+        public async Task ConnectAsync()
+        {
+            // Create a persistent connection
+            var conn = new MpcCoreConnection(mpdIP, mpdPort);
+            mpd = new MpcCoreClient(conn);
+            try
+            {
+                await mpd.ConnectAsync();
+            } catch (SocketException e)
+            {
+                throw new CannotConnectException("MPD connect failed", e);
+            }
+            // Start the monitoring service
+            var ctx = Android.App.Application.Context;
+            var intent = new Intent(ctx, typeof(MpdMonitorService));
+        }
+    }
+}

QuickPlay/Properties/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.quickplay" android:installLocation="auto">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="0.1" package="cz.ledoian.android.quickplay" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="19" />
+	<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="30" />
+	<uses-permission android:name="android.permission.INTERNET" />
 	<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"></application>
-	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 </manifest>

QuickPlay/Properties/AssemblyInfo.cs

@@ -15,6 +15,12 @@ using Android.App;
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
 [assembly: ComVisible(false)]
+#if DEBUG
+[assembly: Application(Debuggable=true)]
+#else
+[assembly: Application(Debuggable = false)]
+#endif
+
 
 // Version information for an assembly consists of the following four values:
 //

QuickPlay/QuickPlay.csproj

@@ -36,14 +36,17 @@
     <WarningLevel>4</WarningLevel>
     <AndroidUseSharedRuntime>True</AndroidUseSharedRuntime>
     <AndroidLinkMode>None</AndroidLinkMode>
-    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
+    <EmbedAssembliesIntoApk>false</EmbedAssembliesIntoApk>
     <AotAssemblies>false</AotAssemblies>
     <EnableLLVM>false</EnableLLVM>
     <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
     <BundleAssemblies>false</BundleAssemblies>
+    <AndroidKeyStore>false</AndroidKeyStore>
+    <AndroidUseAapt2>false</AndroidUseAapt2>
+    <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
-    <DebugSymbols>True</DebugSymbols>
+    <DebugSymbols>false</DebugSymbols>
     <DebugType>portable</DebugType>
     <Optimize>True</Optimize>
     <OutputPath>bin\Release\</OutputPath>
@@ -52,11 +55,20 @@
     <WarningLevel>4</WarningLevel>
     <AndroidManagedSymbols>true</AndroidManagedSymbols>
     <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
-    <AndroidLinkMode>SdkOnly</AndroidLinkMode>
+    <AndroidLinkMode>Full</AndroidLinkMode>
-    <EmbedAssembliesIntoApk>True</EmbedAssembliesIntoApk>
+    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
+    <AotAssemblies>false</AotAssemblies>
+    <EnableLLVM>false</EnableLLVM>
+    <AndroidEnableProfiledAot>false</AndroidEnableProfiledAot>
+    <BundleAssemblies>false</BundleAssemblies>
+    <AndroidLinkTool>r8</AndroidLinkTool>
+    <MandroidI18n />
+    <AndroidSupportedAbis />
+    <AndroidDexTool>d8</AndroidDexTool>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
+    <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Core" />
     <Reference Include="Mono.Android" />
@@ -64,9 +76,16 @@
     <Reference Include="System.Numerics.Vectors" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Configuration.cs" />
+    <Compile Include="IniParser.cs" />
+    <Compile Include="Interfaces.cs" />
+    <Compile Include="LayoutStrategies.cs" />
+    <Compile Include="MpdMonitorService.cs" />
     <Compile Include="MainActivity.cs" />
+    <Compile Include="MpdPlayer.cs" />
     <Compile Include="Resources\Resource.designer.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="SongRecycler.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Resources\AboutResources.txt" />
@@ -77,9 +96,6 @@
     <AndroidResource Include="Resources\layout\activity_main.xml">
       <SubType>Designer</SubType>
     </AndroidResource>
-    <AndroidResource Include="Resources\layout\content_main.xml">
-      <SubType>Designer</SubType>
-    </AndroidResource>
     <AndroidResource Include="Resources\values\colors.xml" />
     <AndroidResource Include="Resources\values\dimens.xml" />
     <AndroidResource Include="Resources\values\ic_launcher_background.xml" />
@@ -105,15 +121,119 @@
     <AndroidResource Include="Resources\mipmap-xxxhdpi\ic_launcher_round.png" />
   </ItemGroup>
   <ItemGroup>
-    <Folder Include="Resources\drawable\" />
+    <AndroidResource Include="Resources\drawable-anydpi\material_settings.xml" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.2.0.5" />
+    <PackageReference Include="Xamarin.Android.Support.Design">
-    <PackageReference Include="Xamarin.AndroidX.Arch.Core.Runtime">
+      <Version>28.0.0.3</Version>
-      <Version>2.1.0.8</Version>
+    </PackageReference>
+    <PackageReference Include="Xamarin.Android.Support.v7.AppCompat">
+      <Version>28.0.0.3</Version>
     </PackageReference>
-    <PackageReference Include="Xamarin.Google.Android.Material" Version="1.0.0.1" />
+    <PackageReference Include="Xamarin.Android.Support.Vector.Drawable">
-    <PackageReference Include="Xamarin.Essentials" Version="1.6.1" />
+      <Version>28.0.0.3</Version>
+    </PackageReference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\Third-party\mpcCore\src\MpcCore\MpcCore.csproj">
+      <Project>{d0a5ad05-b98c-45e6-b61d-4700f7aa72cf}</Project>
+      <Name>MpcCore</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-mdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-hdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xxhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xxxhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\material_settings.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-v21\material_settings.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-v24\material_settings.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-mdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-hdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xxhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\material_settings.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\material_settings.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-mdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-hdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xxhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-xxxhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable\material_edit.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-anydpi\material_edit.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-v21\material_edit.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\drawable-v24\material_edit.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-mdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-hdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xxhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-xxxhdpi\material_edit.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\mipmap-anydpi-v26\material_edit.xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\layout\commonTopBar.axml" />
+  </ItemGroup>
+  <ItemGroup>
+    <AndroidResource Include="Resources\layout\songLayout.xml">
+      <SubType>Designer</SubType>
+    </AndroidResource>
   </ItemGroup>
   <Import Project="$(MSBuildExtensionsPath)\Xamarin\Android\Xamarin.Android.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.

QuickPlay/Resources/drawable-anydpi/material_edit.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" /></vector>

QuickPlay/Resources/drawable-anydpi/material_settings.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z" /></vector>

QuickPlay/Resources/drawable-v21/material_edit.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" /></vector>

QuickPlay/Resources/drawable-v21/material_settings.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z" /></vector>

QuickPlay/Resources/drawable-v24/material_edit.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" /></vector>

QuickPlay/Resources/drawable-v24/material_settings.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z" /></vector>

QuickPlay/Resources/drawable/material_edit.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" /></vector>

QuickPlay/Resources/drawable/material_settings.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z" /></vector>

QuickPlay/Resources/layout/activity_main.xml

@@ -1,32 +1,69 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
+    android:layout_height="fill_parent"
-    android:layout_height="match_parent">
+    android:layout_width="fill_parent"
+    android:orientation="vertical"
+    >
+   <include
+        layout="@layout/commonTopBar"
+        android:id="@+id/commonTopBar"
+    />
 
-    <com.google.android.material.appbar.AppBarLayout
+    <!-- The content itself -->
+    <android.support.design.widget.CoordinatorLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="fill_parent"
-        android:theme="@style/AppTheme.AppBarOverlay">
+        android:layout_below="@id/commonTopBar"
+        android:orientation="vertical">
 
-        <androidx.appcompat.widget.Toolbar
+        <android.support.v7.widget.RecyclerView
-            android:id="@+id/toolbar"
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
+            android:layout_height="match_parent"
-            android:background="?attr/colorPrimary"
+            android:id="@+id/recyclerView1"
-            app:popupTheme="@style/AppTheme.PopupOverlay" />
+        />
-
-    </com.google.android.material.appbar.AppBarLayout>
-
-    <include layout="@layout/content_main" />
 
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        <RelativeLayout
-        android:id="@+id/fab"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="bottom|end"
+            android:layout_marginLeft="5pt"
+            android:layout_marginRight="5pt"
+            android:layout_marginBottom="5pt"
+            android:id="@+id/currentSongBar"
+        >
+            <android.support.design.widget.FloatingActionButton
+                android:layout_width="@dimen/design_fab_size_mini"
+                android:layout_height="@dimen/design_fab_size_mini"
+                android:id="@+id/currentSongInteractButton"
+                android:layout_alignParentRight="true"
+                android:layout_alignParentBottom="true"
+                android:layout_margin="0pt"
+                app:elevation="0dp"
+            />
+            <ProgressBar
+                style="?android:attr/progressBarStyleHorizontal"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:id="@+id/currentSongProgress"
+                android:layout_alignParentLeft="true"
+                android:layout_alignParentBottom="true"
+                android:layout_toLeftOf="@id/currentSongInteractButton"
+            />
+            <TextView
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
+                android:id="@+id/currentSong"
-        android:layout_margin="@dimen/fab_margin"
+                android:text="Hello World!"
-        app:srcCompat="@android:drawable/ic_dialog_email" />
+                android:layout_alignParentLeft="true"
+                android:textAlignment="center"
+                android:layout_toLeftOf="@id/currentSongInteractButton"
+                android:layout_above="@id/currentSongProgress"
+            />
+            <!-- Alternative: SeekBar -->
+        </RelativeLayout>
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+    </android.support.design.widget.CoordinatorLayout>
+</LinearLayout>

QuickPlay/Resources/layout/commonTopBar.axml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8" ?> 
+<android.support.design.widget.AppBarLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+
+    android:layout_width="match_parent"
+    android:layout_height="?attr/actionBarSize"
+    >
+    <android.support.v7.widget.Toolbar
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:id="@+id/toolbar"
+        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
+    >
+        <LinearLayout
+            android:orientation="vertical"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:gravity="center_vertical"
+            android:id="@+id/titleText">
+            <TextView
+                android:text="@string/app_name"
+                android:textAppearance="?android:attr/textAppearanceLarge"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:id="@+id/appTitleText" />
+            <TextView
+                android:text="@string/player_name"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:id="@+id/playerNameText" />
+        </LinearLayout>
+
+    </android.support.v7.widget.Toolbar>
+</android.support.design.widget.AppBarLayout>

QuickPlay/Resources/layout/content_main.xml

@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    app:layout_behavior="@string/appbar_scrolling_view_behavior"
-    tools:showIn="@layout/activity_main">
-
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_centerInParent="true"
-        android:text="Hello World!" />
-
-</RelativeLayout>

QuickPlay/Resources/layout/songLayout.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+
+    android:orientation="vertical"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+    <!-- I am going to assume that the match_parent width respects the two-column layout. -->
+    <!-- The CardView just adds some beauty -->
+    <android.support.v7.widget.CardView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:minHeight="100dp"
+        android:layout_gravity="center"
+        app:cardElevation="4dp"
+        app:cardUseCompatPadding="true"
+        app:cardCornerRadius="5dp"
+    >
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:gravity="center"
+            android:layout_gravity="center"
+            android:text="Song Name"
+            android:id="@+id/songName"
+         />
+    </android.support.v7.widget.CardView>
+
+</FrameLayout>

QuickPlay/Resources/menu/menu_main.xml

@@ -5,5 +5,12 @@
         android:id="@+id/action_settings"
         android:orderInCategory="100"
         android:title="@string/action_settings"
-        app:showAsAction="never" />
+        android:icon="@mipmap/material_settings"
+        app:showAsAction="ifRoom" />
+    <item
+        android:id="@+id/action_edit"
+        android:orderInCategory="200"
+        android:title="@string/action_edit"
+        android:icon="@mipmap/material_edit"
+        app:showAsAction="ifRoom" />
 </menu>

QuickPlay/Resources/mipmap-anydpi-v26/material_edit.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z" /></vector>

QuickPlay/Resources/mipmap-anydpi-v26/material_settings.xml

@@ -0,0 +1 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:width="48dp" android:height="48dp" android:viewportWidth="24" android:viewportHeight="24" android:tint="?attr/colorControlNormal"><path android:fillColor="#FFFFFFFF" android:pathData="M19.14,12.94c0.04,-0.3 0.06,-0.61 0.06,-0.94c0,-0.32 -0.02,-0.64 -0.07,-0.94l2.03,-1.58c0.18,-0.14 0.23,-0.41 0.12,-0.61l-1.92,-3.32c-0.12,-0.22 -0.37,-0.29 -0.59,-0.22l-2.39,0.96c-0.5,-0.38 -1.03,-0.7 -1.62,-0.94L14.4,2.81c-0.04,-0.24 -0.24,-0.41 -0.48,-0.41h-3.84c-0.24,0 -0.43,0.17 -0.47,0.41L9.25,5.35C8.66,5.59 8.12,5.92 7.63,6.29L5.24,5.33c-0.22,-0.08 -0.47,0 -0.59,0.22L2.74,8.87C2.62,9.08 2.66,9.34 2.86,9.48l2.03,1.58C4.84,11.36 4.8,11.69 4.8,12s0.02,0.64 0.07,0.94l-2.03,1.58c-0.18,0.14 -0.23,0.41 -0.12,0.61l1.92,3.32c0.12,0.22 0.37,0.29 0.59,0.22l2.39,-0.96c0.5,0.38 1.03,0.7 1.62,0.94l0.36,2.54c0.05,0.24 0.24,0.41 0.48,0.41h3.84c0.24,0 0.44,-0.17 0.47,-0.41l0.36,-2.54c0.59,-0.24 1.13,-0.56 1.62,-0.94l2.39,0.96c0.22,0.08 0.47,0 0.59,-0.22l1.92,-3.32c0.12,-0.22 0.07,-0.47 -0.12,-0.61L19.14,12.94zM12,15.6c-1.98,0 -3.6,-1.62 -3.6,-3.6s1.62,-3.6 3.6,-3.6s3.6,1.62 3.6,3.6S13.98,15.6 12,15.6z" /></vector>

QuickPlay/Resources/values/strings.xml

@@ -1,4 +1,7 @@
 <resources>
     <string name="app_name">QuickPlay</string>
+    <string name="player_name">Not Connected!</string>
+
     <string name="action_settings">Settings</string>
+    <string name="action_edit">Edit</string>
 </resources>

QuickPlay/Resources/values/styles.xml

@@ -1,11 +1,13 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
     </style>
 
     <style name="AppTheme.NoActionBar">
@@ -13,8 +15,8 @@
         <item name="windowNoTitle">true</item>
     </style>
 
-    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.MaterialComponents.Dark.ActionBar" />
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
 
-    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.MaterialComponents.Light" />
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
 
 </resources>

QuickPlay/SongRecycler.cs

@@ -0,0 +1,57 @@
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Support.V7.Widget;
+using Android.Views;
+using Android.Widget;
+using System;
+using System.Collections.Generic;
+
+namespace QuickPlay
+{
+    class SongRecyclerAdapter : Android.Support.V7.Widget.RecyclerView.Adapter
+    {
+        public event EventHandler<IPlayable> SongClick;
+        IPlayer player;
+        ILayoutStrategy layoutStrategy;
+        public SongRecyclerAdapter(IPlayer player, ILayoutStrategy layoutStrategy)
+        {
+            this.player = player;
+            this.layoutStrategy = layoutStrategy;
+        }
+        public override int ItemCount
+        {
+            get
+            {
+                return player.Songs.Count;
+            }
+        }
+        public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
+        {
+            // I admit I have little idea what I am doing.
+            View itemView = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.songLayout, parent, false);
+            return new SongRecyclerViewHolder(itemView, OnItemClick);
+        }
+        public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
+        {
+            SongRecyclerViewHolder vh = (SongRecyclerViewHolder)holder;
+            List<IPlayable> layout = layoutStrategy.LayOut(player.Songs.Values);
+            vh.SongName.Text = layout[position].Identifier;
+        }
+        void OnItemClick(int position)
+        {
+            IPlayable playable = layoutStrategy.LayOut(player.Songs.Values)[position];
+            if (SongClick != null) SongClick.Invoke(this, playable);
+        }
+    }
+    class SongRecyclerViewHolder : Android.Support.V7.Widget.RecyclerView.ViewHolder
+    {
+        public TextView SongName { get; private set; }
+        public SongRecyclerViewHolder(View itemView, Action<int> callback) : base(itemView)
+        {
+            SongName = itemView.FindViewById<TextView>(Resource.Id.songName);
+            itemView.Click += (sender, e) => callback(base.LayoutPosition);
+        }
+    }
+}

README.md

@@ -0,0 +1,117 @@
+QuickPlay
+===
+
+A simple Xamarin.Android app to allow fast playing of songs on remote players
+like MPD. Supports all Android versions since KitKat (to repurpose an old tablet).
+
+Setup of additional services
+===
+
+Since QuickPlay is only a frontend to MPD running somewhere, and the location
+has to be specified in the player configuration (see below).
+
+Currently, only unauthenticated MPD connections specified by IP address are supported.
+
+Usage
+===
+
+First, make sure that you have the player configuration INI file. Put that on
+the magic URL: <http://www.ms.mff.cuni.cz/~turinskp/znelky.ini>. Now run the
+app, your songs will appear and you can play them.
+
+An example commented INI file is provided: `playerconfig.ini`. This is what you
+would see if you use that:
+
+![UI example](./uiexample.png)
+
+Architecture Overview
+===
+
+The app comprises of three main parts:
+
+- Configuration
+- Player -- the backend
+- Layout -- the frontend
+
+Configuration
+---
+
+The configuration is split into two parts: Applocation configuration and player
+configuration.
+
+Application configuration is local to the device and describes application
+behaviour and where to obtain the player configuration. It
+is just a XML-serializable class (for simplicity).
+
+Player configuration is stored on an HTTP server or local filesystem. It is an
+INI-like file designed to be written by hand. Since INI is not a well-specified
+format, the specific format used in QuickPlay is described in `IniParser.cs`
+file. (It was faster to implement own format than to find a usable one on
+NuGet.) For use as a player configuration, the section `[general]` has to be
+specified with connection details, other sections directly describe individual
+songs.
+
+The motivation for the split is to make player configuration easily shareable,
+e.g. by a QR code pointing to the config.
+
+Currently, there is no application configuration and the player configuration
+is always downloaded from <http://www.ms.mff.cuni.cz/~turinskp/znelky.ini>,
+
+Players
+---
+
+QuickPlay is designed to support other players, not just MPD. Therefore, a
+`Player` is just an interface that can play Playables and export some trivial
+state.
+
+A `Playable` is an abstract object that can be played. Usually it is a song
+(description thereof), but there is a possibility it could be for example a
+playlist. (In the extreme case that someone would like to play chess instead of
+songs, the individual chess pieces would be playables.)
+
+In order to allow players to show current state, `MainActivity` has method
+`OnPlayerUpdate`, which re-fetches player state and displays it.
+
+It is expected that the players will maintain a service to monitor the remote
+state. It is not required though, it is really implementation detail of the
+client. (`MainActivity.OnPlayerUpdate` still has to be run on UI thread.)
+
+### MpdPlayer details
+
+The MpdPlayer is just a thin wrapper around [slightly
+patched](https://github.com/LEdoian/mpcCore)
+[mpcCore](https://github.com/svanelten/mpcCore) library. It currently only
+sends commands to the MPD, but extension by service to monitor it is ready
+(`MpdMonitorService.cs`).
+
+
+Frontend
+---
+
+Frontend is just a bunch of boilerplate code to power the RecyclerView behind
+it. The only "original" part are layout strategies -- objects that determine in
+what order the playables will be shown, based on their metadata.
+
+At the moment, the only layout strategy implemented is lexicographic sorting by
+the shown name.
+
+
+Planned Features
+====
+
+- [ ] Working application configuration
+- [ ] Player configuration sharing via QR codes
+- [ ] Showing current song progress
+- [ ] Possibility to stop current song
+- [ ] MPD player monitoring service
+- [ ] Time-based layout strategy
+
+Bugs
+---
+
+- [ ] The MpcCore client seems to disconnect after some time for no apparent reason.
+
+The far future
+---
+- [ ] Editing the player config right on the device (with INI file export)
+- [ ] Tests. (The code should be testable, but no tests has been written yet.)

playerconfig.ini

@@ -0,0 +1,43 @@
+# This is a player configuration example for QuickPlay.
+# Everything after either ';' or '#' is ignored.
+# Spaces around '=' and at both ends of each line are trimmed.
+# Everything is case-sensitive and UTF-8.
+# Multiple sections are forbidden, so are same keys in same section.
+# (Really, this is just an encoding of a Dictionary<string, Dictionary<string, string>>)
+
+# Section 'general' is special, it declares general config (well...) of the
+# player
+[general]
+# Name is shown in the app to aid distinguishing between multiple possible players
+name = Example client
+# Type will determine what kind of player should be used. Currently it is not used.
+# More generally, keys that are not used are ignored. They are still parsed,
+# though, and should be considered reserved by QuickPlay (i.e. not used arbitrarily).
+type = MPD
+# Connection specifies where to connect. Usually it is just IP address, but if
+# you want to specify port, use notation ip.ad.dr.ess@port (i.e. separate using '@').
+connection = 198.51.100.3
+
+# All other sections represent individual songs / playables.
+# The section name is the name the song will be visible as.
+[Breakfast]
+# Expected time of playing. Currently unused, will be used for sorting.
+# Allowed format: HH:MM.
+time = 15:00
+# Path, under which MPD can find the song. Can contain even strange characters,
+# but cannot start with whitespace due to trimming. (Frankly, if your
+# filenames start with whitespace, you have much bigger problems.)
+path = Unsorted/Kevin_MacLeod/Polkas/Snare Bounce Polka.mp3
+
+# Create as many playables as you wish. Remember, no repeating of section names.
+[Lunch]
+time = 16:00
+path = Classical/MacLeod K. - Dance of the Sugar Plum Fairy (P.I.Tchaikovsky).mp3
+
+# Even section names are UTF-8, so we can use non-plain-ASCII characters.
+[Café]
+time = 22:00
+path = Irish/Fiddles McGinty.mp3
+
+# All the mentioned songs are from Kevin MacLeod under CC BY 4.0 licence. Not
+# that you can hear them, but the attribution has to be somewhere :-)

specifikace.txt

@@ -0,0 +1,13 @@
+jako zápočtový program do C# (NPRG035) bych chtěl dělat aplikaci pro
+Android na rychlé spouštění skladeb pomocí Music Player Daemonu (MPD).
+Použili bychom to v rámci korespondenčního semináře M&M, kde tento
+přehrávač používáme jako "znělky" ke svolání účastníků soustředění na
+program.
+
+Program by tedy sestával z tlačítek pro různé znělky, při jejichž
+stisknutí by se daná znělka spustila. Tato tlačítka by byla popsána v
+nějakém konfiguračním souboru (asi INI), který by si uživatelé mohli
+stáhnout a nahrát.
+
+Očekávám, že bych to psal v Xamarinu s použitím existujících bindingů
+pro ovládáni MPD. Chtěl bych si vyzkoušet psaní mobilních aplikací.