Added samples from xamarin-forms-samples

samples/.gitattributes

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+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.c text
+*.h text
+*.cs text
+*.csproj text
+
+# Declare files that will always have CRLF line endings on checkout.
+*.sln text eol=crlf
+packages.config text eol=crlf
+
+# Declare files that will always have LF line endings on checkout.
+*.sh text eol=lf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary

samples/.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# Visual Studio (>=2015) project-specific, machine local files
+.vs/
+
+# User-specific files
+*.suo
+*.user
+*.sln.docstates
+*.userprefs
+
+# ignore Xamarin.Android Resource.Designer.cs files
+**/*.Droid/**/[Rr]esource.[Dd]esigner.cs
+**/*.Android/**/[Rr]esource.[Dd]esigner.cs
+**/Android/**/[Rr]esource.[Dd]esigner.cs
+**/Droid/**/[Rr]esource.[Dd]esigner.cs
+
+# Xamarin Components
+Components/
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+x64/
+build/
+bld/
+[Bb]in/
+[Oo]bj/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+#NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opensdf
+*.sdf
+*.cachefile
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding addin-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+*.ncrunch*
+_NCrunch_*
+.*crunch*.local.xml
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+
+# NuGet Packages Directory
+packages/
+*.nuget.targets
+*.lock.json
+*.nuget.props
+
+## TODO: If the tool you use requires repositories.config uncomment the next line
+#!packages/repositories.config
+
+# Enable "build/" folder in the NuGet Packages folder since NuGet packages use it for MSBuild targets
+# This line needs to be after the ignore of the build folder (and the packages folder if the line above has been uncommented)
+!packages/build/
+
+# Windows Azure Build Output
+csx/
+*.build.csdef
+
+# Windows Store app package directory
+AppPackages/
+
+# Others
+sql/
+*.Cache
+ClientBin/
+[Ss]tyle[Cc]op.*
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.pfx
+*.publishsettings
+node_modules/
+.DS_Store
+*.bak
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file to a newer
+# Visual Studio version. Backup files are not needed, because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+.vscode/settings.json

samples/Demos/Demos/SkiaSharpFormsDemos.Droid/Assets/AboutAssets.txt

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+Any raw assets you want to be deployed with your application can be placed in
+this directory (and child directories) and given a Build Action of "AndroidAsset".
+
+These files will be deployed with you package and will be accessible using Android's
+AssetManager, like this:
+
+public class ReadAsset : Activity
+{
+	protected override void OnCreate (Bundle bundle)
+	{
+		base.OnCreate (bundle);
+
+		InputStream input = Assets.Open ("my_asset.txt");
+	}
+}
+
+Additionally, some Android functions will automatically load asset files:
+
+Typeface tf = Typeface.CreateFromAsset (Context.Assets, "fonts/samplefont.ttf");

samples/Demos/Demos/SkiaSharpFormsDemos.Droid/MainActivity.cs

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+using System.IO;
+using System.Threading.Tasks;
+
+using Android.App;
+using Android.Content;
+using Android.Content.PM;
+using Android.OS;
+
+namespace SkiaSharpFormsDemos.Droid
+{
+    [Activity(Label = "SkiaSharpFormsDemos", Icon = "@drawable/icon", Theme = "@style/MainTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        internal static MainActivity Instance { get; private set; }
+
+        protected override void OnCreate(Bundle bundle)
+        {
+            base.OnCreate(bundle);
+            Instance = this;
+            global::Xamarin.Forms.Forms.Init(this, bundle);
+            LoadApplication(new App());
+        }
+
+        // Field, property, and method for Picture Picker
+        public static readonly int PickImageId = 1000;
+
+        public TaskCompletionSource<Stream> PickImageTaskCompletionSource { set; get; }
+
+        protected override void OnActivityResult(int requestCode, Result resultCode, Intent intent)
+        {
+            base.OnActivityResult(requestCode, resultCode, intent);
+
+            if (requestCode == PickImageId)
+            {
+                if ((resultCode == Result.Ok) && (intent != null))
+                {
+                    Android.Net.Uri uri = intent.Data;
+                    Stream stream = ContentResolver.OpenInputStream(uri);
+
+                    // Set the Stream as the completion of the Task
+                    PickImageTaskCompletionSource.SetResult(stream);
+                }
+                else
+                {
+                    PickImageTaskCompletionSource.SetResult(null);
+                }
+            }
+        }
+    }
+}
+

samples/Demos/Demos/SkiaSharpFormsDemos.Droid/PhotoLibrary.cs

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+// using System;
+// using System.IO;
+using System.Threading.Tasks;
+
+using Android.Content;
+using Android.Media;
+using Android.OS;
+using Java.IO;
+
+using Xamarin.Forms;
+
+using SkiaSharpFormsDemos.Droid;
+
+[assembly: Dependency(typeof(PhotoLibrary))]
+
+namespace SkiaSharpFormsDemos.Droid
+{
+    public class PhotoLibrary : IPhotoLibrary
+    {
+        public Task<System.IO.Stream> PickPhotoAsync()
+        {
+            // Define the Intent for getting images
+            Intent intent = new Intent();
+            intent.SetType("image/*");
+            intent.SetAction(Intent.ActionGetContent);
+
+            // Start the picture-picker activity (resumes in MainActivity.cs)
+            MainActivity.Instance.StartActivityForResult(
+                Intent.CreateChooser(intent, "Select Picture"),
+                MainActivity.PickImageId);
+
+            // Save the TaskCompletionSource object as a MainActivity property
+            MainActivity.Instance.PickImageTaskCompletionSource = new TaskCompletionSource<System.IO.Stream>();
+
+            // Return Task object
+            return MainActivity.Instance.PickImageTaskCompletionSource.Task;
+        }
+
+        // Saving photos requires android.permission.WRITE_EXTERNAL_STORAGE in AndroidManifest.xml
+
+        public async Task<bool> SavePhotoAsync(byte[] data, string folder, string filename)
+        {
+            try
+            {
+                File picturesDirectory = Environment.GetExternalStoragePublicDirectory(Environment.DirectoryPictures);
+                File folderDirectory = picturesDirectory;
+
+                if (!string.IsNullOrEmpty(folder))
+                {
+                    folderDirectory = new File(picturesDirectory, folder);
+                    folderDirectory.Mkdirs();
+                }
+
+                using (File bitmapFile = new File(folderDirectory, filename))
+                {
+                    bitmapFile.CreateNewFile();
+
+                    using (FileOutputStream outputStream = new FileOutputStream(bitmapFile))
+                    {
+                        await outputStream.WriteAsync(data);
+                    }
+
+                    // Make sure it shows up in the Photos gallery promptly.
+                    MediaScannerConnection.ScanFile(MainActivity.Instance,
+                                                    new string[] { bitmapFile.Path },
+                                                    new string[] { "image/png", "image/jpeg" }, null);
+                }
+            }
+            catch
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}
+
+
+

samples/Demos/Demos/SkiaSharpFormsDemos.Droid/Properties/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto">
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29" />
+	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+	<application android:label="SkiaSharpFormsDemos.Droid"></application>
+</manifest>