This is basic, but at least can launch on Android 4.4.

NuGet.Config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+   <add key="Local (Sundew)" value="C:\Users\Me\AppData\Local\Sundew.Packaging.Publish.m\packages" />
+  </packageSources>
+</configuration>

QuickPlay.sln

@@ -5,10 +5,17 @@ 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}") = "MpcNET", "..\..\Third-party\MpcNET\Source\MpcNET\MpcNET.csproj", "{9477D75F-2F50-41A8-A082-B43873FFE0B4}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "MpcCore", "..\..\Third-party\mpcCore\src\MpcCore\MpcCore.csproj", "{D0A5AD05-B98C-45E6-B61D-4700F7AA72CF}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MPDConsoleTests", "..\MPDConsoleTests\MPDConsoleTests.csproj", "{8A1047BF-5D07-4242-9DB8-1D419B953E34}"
+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 +24,27 @@ 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
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Release-Stable|Any CPU.ActiveCfg = Release-Stable|Any CPU
+		{9477D75F-2F50-41A8-A082-B43873FFE0B4}.Release-Stable|Any CPU.Build.0 = Release-Stable|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
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Release-Stable|Any CPU.ActiveCfg = Release|Any CPU
+		{8A1047BF-5D07-4242-9DB8-1D419B953E34}.Release-Stable|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

QuickPlay/Configuration.cs

@@ -1,14 +1,30 @@
 using System;
 using System.IO;
 
-namespace QuickPlayer
+namespace QuickPlay
 {
     /// <summary>
     /// Application (global) configuration data class
     /// </summary>
-    class AppConfiguration
+    [Serializable]
+    sealed class AppConfiguration
     {
+        public readonly string playerConfigUrl;
 
+        public static AppConfiguration loadSavedConfiguration()
+        {
+            throw new NotImplementedException();
+        }
+
+        public void saveConfiguration()
+        {
+
+
+
+            // 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.");
+        }
     }
 
     /// <summary>
@@ -31,12 +47,15 @@ namespace QuickPlayer
 
     sealed class NetworkConfigurationProvider : IPlayerConfigurationProvider
     {
-
+        PlayerConfiguration IPlayerConfigurationProvider.GetConfiguration()
+        {
+            throw new NotImplementedException();
+        }
     }
 
     sealed class FileConfigurationProvider : IPlayerConfigurationProvider
     {
-        public readonly StreamReader reader;
+        StreamReader reader;
         public FileConfigurationProvider(StreamReader reader)
         {
             this.reader = reader;

QuickPlay/Interfaces.cs

@@ -2,7 +2,7 @@
 using System.Collections.Generic;
 
 // MPD client abstractions and simplifications
-namespace QuickPlayer
+namespace QuickPlay
 {
     /// <summary>
     /// Simplified abstraction of possible players. Only methods needed are included.

QuickPlay/MainActivity.cs

@@ -1,60 +1,58 @@
 using System;
 using Android.App;
 using Android.OS;
-using Android.Runtime;
+//using Android.Runtime;
-using Android.Views;
+//using Android.Views;
-using AndroidX.AppCompat.Widget;
+//using AndroidX.AppCompat.Widget;
-using AndroidX.AppCompat.App;
+//using AndroidX.AppCompat.App;
-using Google.Android.Material.FloatingActionButton;
+//using Google.Android.Material.FloatingActionButton;
-using Google.Android.Material.Snackbar;
+//using Google.Android.Material.Snackbar;
+using Android.Support.V7.App;
+using Toolbar = Android.Support.V7.Widget.Toolbar;
+
+using System.Net;
+//using MpcNET;
+//using MpcNET.Commands.Playback;
+//using MpcCore;
+//using MpcCore.Commands.Player;
+//using MpcCore.Response;
+using System.Collections.Generic;
 
 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
     {
+        private AppConfiguration appConfig;
+        private List<PlayerConfiguration> playerConfigs;
+
         protected override void OnCreate(Bundle savedInstanceState)
         {
             base.OnCreate(savedInstanceState);
-            Xamarin.Essentials.Platform.Init(this, savedInstanceState);
-            SetContentView(Resource.Layout.activity_main);
 
-            Toolbar toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
-            SetSupportActionBar(toolbar);
-
-            FloatingActionButton fab = FindViewById<FloatingActionButton>(Resource.Id.fab);
-            fab.Click += FabOnClick;
-        }
-
-        public override bool OnCreateOptionsMenu(IMenu menu)
-        {
-            MenuInflater.Inflate(Resource.Menu.menu_main, menu);
-            return true;
-        }
 
-        public override bool OnOptionsItemSelected(IMenuItem item)
+            // App initialization
-        {
+            //appConfig = AppConfiguration.loadSavedConfiguration();
-            int id = item.ItemId;
+            //playerConfigs = acquirePlayerConfigs();
-            if (id == Resource.Id.action_settings)
-            {
-                return true;
-            }
 
-            return base.OnOptionsItemSelected(item);
+            // UI initialization
-        }
+            SetContentView(Resource.Layout.activity_main);
 
-        private void FabOnClick(object sender, EventArgs eventArgs)
+            // UI Toolbar initialization
-        {
+      //      var toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
-            View view = (View) sender;
+      //      SetSupportActionBar(toolbar);
-            Snackbar.Make(view, "Replace with your own action", Snackbar.LengthLong)
+      //      ActionBar.Title = "My Toolbar";
-                .SetAction("Action", (View.IOnClickListener)null).Show();
         }
 
-        public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
+        List<PlayerConfiguration> acquirePlayerConfigs()
         {
-            Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+            // FIXME: Bad! We have IPlayerConfigurationProviders
+            ///var url = appConfig.playerConfigUrl;
+            // TODO: Learn cURL and get configs :-)
 
-            base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
+            return null;
+            throw new NotImplementedException();
         }
+
     }
 }

QuickPlay/MpdMonitorService.cs

@@ -0,0 +1,34 @@
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace QuickPlay
+{  
+    [Service(Exported = true, Name = "cz.ledoian.quickplay.mpdmonior")]
+    class MpdMonitorService : Service
+    {
+        public override void OnCreate()
+        {
+            base.OnCreate();
+        }
+        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/Properties/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?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="1.0" package="cz.ledoian.android.quickplay" android:installLocation="auto">
 	<uses-sdk android:minSdkVersion="19" android:targetSdkVersion="19" />
 	<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" />

QuickPlay/QuickPlay.csproj

@@ -36,11 +36,13 @@
     <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>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugSymbols>True</DebugSymbols>
@@ -64,6 +66,9 @@
     <Reference Include="System.Numerics.Vectors" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Configuration.cs" />
+    <Compile Include="Interfaces.cs" />
+    <Compile Include="MpdMonitorService.cs" />
     <Compile Include="MainActivity.cs" />
     <Compile Include="Resources\Resource.designer.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
@@ -108,12 +113,18 @@
     <Folder Include="Resources\drawable\" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Xamarin.AndroidX.AppCompat" Version="1.2.0.5" />
+    <PackageReference Include="Xamarin.Android.Support.v7.AppCompat">
-    <PackageReference Include="Xamarin.AndroidX.Arch.Core.Runtime">
+      <Version>28.0.0.3</Version>
-      <Version>2.1.0.8</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>
   <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/layout/activity_main.xml

@@ -1,32 +1,63 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<!--
+<android.support.design.widget.CoordinatorLayout
+    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">
 
-    <com.google.android.material.appbar.AppBarLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:theme="@style/AppTheme.AppBarOverlay">
     
-        <androidx.appcompat.widget.Toolbar
+    <android.support.v7.wid.
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/abc_action_bar_content_inset_with_nav">
+-->
+<!-- TODO: Use Coordinator layout -->
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_height="fill_parent"
+    android:layout_width="fill_parent"
+    >
+      <!--  <android.support.v7.widget.Toolbar
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
             android:id="@+id/toolbar"
+            android:theme="@android:style/ThemeOverlay.Material.Dark.ActionBar">
+            <LinearLayout
+                android:orientation="vertical"
                 android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize"
+                android:layout_height="match_parent"
-            android:background="?attr/colorPrimary"
+                android:gravity="center_vertical"
-            app:popupTheme="@style/AppTheme.PopupOverlay" />
+                android:id="@+id/titleText">
-
+               <TextView
-    </com.google.android.material.appbar.AppBarLayout>
+                    android:text="@string/app_name"
-
+                    android:textAppearance="?android:attr/textAppearanceLarge"
-    <include layout="@layout/content_main" />
+                    android:layout_width="wrap_content"
-
+                    android:layout_height="wrap_content"
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
+                    android:id="@+id/appTitleText" />
-        android:id="@+id/fab"
+               <TextView
+                    android:text="@string/player_name"
+                    android:textAppearance="?android:attr/textAppearanceMedium"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
-        android:layout_gravity="bottom|end"
+                    android:id="@+id/playerNameText" />
-        android:layout_margin="@dimen/fab_margin"
+            </LinearLayout>
-        app:srcCompat="@android:drawable/ic_dialog_email" />
+        </android.support.v7.widget.Toolbar>
+    -->
+ <!--   </android.support.design.widget.AppBarLayout>
+    -->
 
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+    <include layout="@layout/content_main" />
+    <!--<LinearLayout
+        android:orientation="vertical"
+        android:minWidth="25px"
+        android:minHeight="25px"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:id="@+id/linearLayout1" />
+    -->
+</RelativeLayout>
+ <!--    
+</android.support.design.widget.CoordinatorLayout>
+-->

QuickPlay/Resources/layout/content_main.xml

@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- LinearLayout? -->
 <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

QuickPlay/Resources/values/strings.xml

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">QuickPlay</string>
     <string name="action_settings">Settings</string>
+    <string name="player_name">Not Connected!</string>
 </resources>

QuickPlay/Resources/values/styles.xml

@@ -1,7 +1,7 @@
 <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>
@@ -13,8 +13,8 @@
         <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>