From 5a8e6179da4f961413f3cdea89e037a93e4bee3e Mon Sep 17 00:00:00 2001
From: BobLd <38405645+BobLd@users.noreply.github.com>
Date: Sat, 4 May 2024 17:13:43 +0100
Subject: [PATCH] Add AndroidSystemFontLister

---
 .../SystemFonts/AndroidSystemFontLister.cs    | 52 +++++++++++++++++++
 .../SystemFonts/LinuxSystemFontLister.cs      |  2 +-
 .../SystemFonts/MacSystemFontLister.cs        |  2 +-
 .../SystemFonts/SystemFontFinder.cs           |  6 +++
 .../SystemFonts/WindowsSystemFontLister.cs    |  2 +-
 5 files changed, 61 insertions(+), 3 deletions(-)
 create mode 100644 src/UglyToad.PdfPig.Fonts/SystemFonts/AndroidSystemFontLister.cs

diff --git a/src/UglyToad.PdfPig.Fonts/SystemFonts/AndroidSystemFontLister.cs b/src/UglyToad.PdfPig.Fonts/SystemFonts/AndroidSystemFontLister.cs
new file mode 100644
index 00000000..da574dba
--- /dev/null
+++ b/src/UglyToad.PdfPig.Fonts/SystemFonts/AndroidSystemFontLister.cs
@@ -0,0 +1,52 @@
+namespace UglyToad.PdfPig.Fonts.SystemFonts
+{
+#if NET
+    using System.Collections.Generic;
+    using System.IO;
+
+    internal sealed class AndroidSystemFontLister : ISystemFontLister
+    {
+        public IEnumerable<SystemFontRecord> GetAllFonts()
+        {
+            var directories = new List<string>
+            {
+                "/system/fonts",
+            };
+
+            foreach (var directory in directories)
+            {
+                try
+                {
+                    if (!Directory.Exists(directory))
+                    {
+                        continue;
+                    }
+                }
+                catch
+                {
+                    continue;
+                }
+
+                string[] files;
+
+                try
+                {
+                    files = Directory.GetFiles(directory, "*.*", SearchOption.AllDirectories);
+                }
+                catch
+                {
+                    continue;
+                }
+
+                foreach (var file in files)
+                {
+                    if (SystemFontRecord.TryCreate(file, out var record))
+                    {
+                        yield return record;
+                    }
+                }
+            }
+        }
+    }
+#endif
+}
diff --git a/src/UglyToad.PdfPig.Fonts/SystemFonts/LinuxSystemFontLister.cs b/src/UglyToad.PdfPig.Fonts/SystemFonts/LinuxSystemFontLister.cs
index 0c7edcbb..ee8a4ec1 100644
--- a/src/UglyToad.PdfPig.Fonts/SystemFonts/LinuxSystemFontLister.cs
+++ b/src/UglyToad.PdfPig.Fonts/SystemFonts/LinuxSystemFontLister.cs
@@ -4,7 +4,7 @@
     using System.Collections.Generic;
     using System.IO;
 
-    internal class LinuxSystemFontLister : ISystemFontLister
+    internal sealed class LinuxSystemFontLister : ISystemFontLister
     {
         public IEnumerable<SystemFontRecord> GetAllFonts()
         {
diff --git a/src/UglyToad.PdfPig.Fonts/SystemFonts/MacSystemFontLister.cs b/src/UglyToad.PdfPig.Fonts/SystemFonts/MacSystemFontLister.cs
index 47c22430..b074f757 100644
--- a/src/UglyToad.PdfPig.Fonts/SystemFonts/MacSystemFontLister.cs
+++ b/src/UglyToad.PdfPig.Fonts/SystemFonts/MacSystemFontLister.cs
@@ -4,7 +4,7 @@
     using System.Collections.Generic;
     using System.IO;
 
-    internal class MacSystemFontLister : ISystemFontLister
+    internal sealed class MacSystemFontLister : ISystemFontLister
     {
         public IEnumerable<SystemFontRecord> GetAllFonts()
         {
diff --git a/src/UglyToad.PdfPig.Fonts/SystemFonts/SystemFontFinder.cs b/src/UglyToad.PdfPig.Fonts/SystemFonts/SystemFontFinder.cs
index 1720fe43..8482ef79 100644
--- a/src/UglyToad.PdfPig.Fonts/SystemFonts/SystemFontFinder.cs
+++ b/src/UglyToad.PdfPig.Fonts/SystemFonts/SystemFontFinder.cs
@@ -89,6 +89,12 @@ namespace UglyToad.PdfPig.Fonts.SystemFonts
             {
                 lister = new LinuxSystemFontLister();
             }
+#if NET
+            else if (OperatingSystem.IsAndroid())
+            {
+              lister = new AndroidSystemFontLister();
+            }
+#endif
             else
             {
                 throw new NotSupportedException($"Unsupported operating system: {RuntimeInformation.OSDescription}.");
diff --git a/src/UglyToad.PdfPig.Fonts/SystemFonts/WindowsSystemFontLister.cs b/src/UglyToad.PdfPig.Fonts/SystemFonts/WindowsSystemFontLister.cs
index 8740a8ac..a8dc6b8c 100644
--- a/src/UglyToad.PdfPig.Fonts/SystemFonts/WindowsSystemFontLister.cs
+++ b/src/UglyToad.PdfPig.Fonts/SystemFonts/WindowsSystemFontLister.cs
@@ -4,7 +4,7 @@
     using System.Collections.Generic;
     using System.IO;
 
-    internal class WindowsSystemFontLister : ISystemFontLister
+    internal sealed class WindowsSystemFontLister : ISystemFontLister
     {
         public IEnumerable<SystemFontRecord> GetAllFonts()
         {