From 910e35d0d182816b4dd25b941711540a1168c27a Mon Sep 17 00:00:00 2001
From: cwalker <chris.walker@nelnet.net>
Date: Mon, 19 Sep 2022 17:08:25 -0400
Subject: [PATCH 1/4] Fix needed to rotate device to landscape to scan 1D
 barcodes

---
 ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
index fe9f5b6..bcd85ca 100644
--- a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
+++ b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
@@ -63,6 +63,7 @@ public void Connect()
 				// Frame by frame analyze
 				imageAnalyzer = new ImageAnalysis.Builder()
 					.SetDefaultResolution(new Android.Util.Size(640, 480))
+					.SetOutputImageRotationEnabled(true)
 					.SetBackpressureStrategy(ImageAnalysis.StrategyKeepOnlyLatest)
 					.Build();
 

From cc715e56181907ec305ea1cc6503450faf9e843e Mon Sep 17 00:00:00 2001
From: cwalker <chris.walker@nelnet.net>
Date: Fri, 23 Sep 2022 12:12:43 -0400
Subject: [PATCH 2/4] Implement AutoFocus via Timer, and tap to focus

---
 BigIslandBarcode/BigIslandBarcode.csproj      |  5 ++
 BigIslandBarcode/MainPage.xaml                |  6 +-
 BigIslandBarcode/MainPage.xaml.cs             |  5 +-
 .../Android/CameraManager.android.cs          | 82 ++++++++++++++++++-
 4 files changed, 89 insertions(+), 9 deletions(-)

diff --git a/BigIslandBarcode/BigIslandBarcode.csproj b/BigIslandBarcode/BigIslandBarcode.csproj
index 0e373eb..efcbbc7 100644
--- a/BigIslandBarcode/BigIslandBarcode.csproj
+++ b/BigIslandBarcode/BigIslandBarcode.csproj
@@ -30,6 +30,11 @@
 
 	</PropertyGroup>
 
+	<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+	  <WarningLevel>4</WarningLevel>
+	  <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
+	</PropertyGroup>
+
 	<ItemGroup>
 		<!-- App Icon -->
 		<MauiImage Include="Resources\appicon.svg" ForegroundScale="0.8" ForegroundFile="Resources\appiconfg.svg" IsAppIcon="true" Color="#512BD4" />
diff --git a/BigIslandBarcode/MainPage.xaml b/BigIslandBarcode/MainPage.xaml
index bb357b5..c5f0d2c 100644
--- a/BigIslandBarcode/MainPage.xaml
+++ b/BigIslandBarcode/MainPage.xaml
@@ -15,7 +15,7 @@
 		<Grid
 			Grid.Row="0"
 			BackgroundColor="#aa000000">
-			<Label Grid.Row="2" Text="Top text..." HorizontalOptions="Center" VerticalOptions="Center" TextColor="White" />
+			<Label x:Name="topText" Grid.Row="2" Text="Top text..." HorizontalOptions="Center" VerticalOptions="Center" TextColor="White" />
 		</Grid>
 
 		<Grid
@@ -26,7 +26,7 @@
 
 			<Button Text="🔄️" Grid.Column="0" BackgroundColor="#aa000000" CornerRadius="8" BorderColor="Black" Clicked="SwitchCameraButton_Clicked" />
 
-			<zxing:BarcodeGeneratorView
+			<!--<zxing:BarcodeGeneratorView
 				x:Name="barcodeGenerator"
 				Grid.Column="1"
 				HorizontalOptions="Center"
@@ -36,7 +36,7 @@
 				ForegroundColor="DarkBlue"
 				Format="QrCode"
 				Value="Bla"
-				BarcodeMargin="1" />
+				BarcodeMargin="1" />-->
 
 			<Button Text="💡" Grid.Column="2" BackgroundColor="#aa000000" CornerRadius="8" BorderColor="Black" Clicked="TorchButton_Clicked" />
 		</Grid>
diff --git a/BigIslandBarcode/MainPage.xaml.cs b/BigIslandBarcode/MainPage.xaml.cs
index 5a6e38f..cd486ec 100644
--- a/BigIslandBarcode/MainPage.xaml.cs
+++ b/BigIslandBarcode/MainPage.xaml.cs
@@ -28,8 +28,9 @@ protected void BarcodesDetected(object sender, BarcodeDetectionEventArgs e)
 			{
 				var r = e.Results.First();
 
-				barcodeGenerator.Value = r.Value;
-				barcodeGenerator.Format = r.Format;
+				topText.Text = $"{r.Format.ToString()}: {r.Value}";
+				//barcodeGenerator.Value = r.Value;
+				//barcodeGenerator.Format = r.Format;
 			});
 		}
 
diff --git a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
index bcd85ca..452862b 100644
--- a/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
+++ b/ZXing.Net.MAUI/Platforms/Android/CameraManager.android.cs
@@ -39,10 +39,12 @@ internal partial class CameraManager
 		ProcessCameraProvider cameraProvider;
 		ICamera camera;
 
+		Timer timer;
+
 		public NativePlatformCameraPreviewView CreateNativeView()
 		{
 			previewView = new PreviewView(Context.Context);
-			cameraExecutor = Executors.NewSingleThreadExecutor();
+            cameraExecutor = Executors.NewSingleThreadExecutor();
 
 			return previewView;
 		}
@@ -72,9 +74,64 @@ public void Connect()
 
 				UpdateCamera();
 
-			}), ContextCompat.GetMainExecutor(Context.Context)); //GetMainExecutor: returns an Executor that runs on the main thread.
+				AutoFocus();
+				setupAutoFocusTimer();
+				((View)previewView.Parent).SetOnTouchListener(new TapFocusTouchListener(this));
+
+
+            }), ContextCompat.GetMainExecutor(Context.Context)); //GetMainExecutor: returns an Executor that runs on the main thread.
 		}
 
+		private class TapFocusTouchListener : Java.Lang.Object, View.IOnTouchListener {
+
+            private CameraManager cameraManager;
+
+            public TapFocusTouchListener(CameraManager cameraManager)
+            {
+                this.cameraManager = cameraManager;
+            }
+
+            public bool OnTouch(View v, MotionEvent e)
+            {
+
+                if (e.Action == MotionEventActions.Down)
+                {
+					Point point = new Point(((int)e.GetX()), ((int)e.GetY()));
+					cameraManager.Focus(point);
+                    return true;
+                }
+                return false;
+            }
+        }
+
+		private void setupAutoFocusTimer()
+        {
+			if(timer != null)
+            {
+				timer.Cancel();
+				timer.Dispose();
+				timer = null;
+            }
+			timer = new Timer();
+			var task = new AFTimerTask(this);
+			timer.ScheduleAtFixedRate(task, 5000, 5000);
+        }
+
+		private class AFTimerTask : TimerTask
+        {
+			private CameraManager cameraManager;
+
+			public AFTimerTask(CameraManager manager)
+            {
+				this.cameraManager = manager;
+            }
+
+			public override void Run()
+            {
+				cameraManager.AutoFocus();
+            }
+        }
+
 		public void Disconnect()
 		{ }
 
@@ -111,13 +168,30 @@ public void UpdateTorch(bool on)
 
 		public void Focus(Point point)
 		{
+			camera?.CameraControl?.CancelFocusAndMetering();
 
-		}
+			var factory = new SurfaceOrientedMeteringPointFactory(previewView.LayoutParameters.Width, previewView.LayoutParameters.Height);
+			var fpoint = factory.CreatePoint(point.X, point.Y);
+            var action = new FocusMeteringAction.Builder(fpoint, FocusMeteringAction.FlagAf)
+                                    .DisableAutoCancel()
+                                    .Build();
+
+            camera?.CameraControl?.StartFocusAndMetering(action);
+
+        }
 
 		public void AutoFocus()
 		{
+            camera?.CameraControl?.CancelFocusAndMetering();
+            var factory = new SurfaceOrientedMeteringPointFactory(1f, 1f);
+			var fpoint = factory.CreatePoint(.5f, .5f);
+            var action = new FocusMeteringAction.Builder(fpoint,FocusMeteringAction.FlagAf)
+                                    //.DisableAutoCancel()
+                                    .Build();
 
-		}
+            camera?.CameraControl?.StartFocusAndMetering(action);
+
+        }
 
 		public void Dispose()
 		{

From e8386acf9b0d220149e3351d4684f04c4c71171b Mon Sep 17 00:00:00 2001
From: cwalker <chris.walker@nelnet.net>
Date: Fri, 23 Sep 2022 12:16:50 -0400
Subject: [PATCH 3/4] Undo csproj and MainPage.xaml changes

---
 BigIslandBarcode/BigIslandBarcode.csproj | 5 -----
 BigIslandBarcode/MainPage.xaml           | 6 +++---
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/BigIslandBarcode/BigIslandBarcode.csproj b/BigIslandBarcode/BigIslandBarcode.csproj
index efcbbc7..0e373eb 100644
--- a/BigIslandBarcode/BigIslandBarcode.csproj
+++ b/BigIslandBarcode/BigIslandBarcode.csproj
@@ -30,11 +30,6 @@
 
 	</PropertyGroup>
 
-	<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
-	  <WarningLevel>4</WarningLevel>
-	  <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
-	</PropertyGroup>
-
 	<ItemGroup>
 		<!-- App Icon -->
 		<MauiImage Include="Resources\appicon.svg" ForegroundScale="0.8" ForegroundFile="Resources\appiconfg.svg" IsAppIcon="true" Color="#512BD4" />
diff --git a/BigIslandBarcode/MainPage.xaml b/BigIslandBarcode/MainPage.xaml
index c5f0d2c..bb357b5 100644
--- a/BigIslandBarcode/MainPage.xaml
+++ b/BigIslandBarcode/MainPage.xaml
@@ -15,7 +15,7 @@
 		<Grid
 			Grid.Row="0"
 			BackgroundColor="#aa000000">
-			<Label x:Name="topText" Grid.Row="2" Text="Top text..." HorizontalOptions="Center" VerticalOptions="Center" TextColor="White" />
+			<Label Grid.Row="2" Text="Top text..." HorizontalOptions="Center" VerticalOptions="Center" TextColor="White" />
 		</Grid>
 
 		<Grid
@@ -26,7 +26,7 @@
 
 			<Button Text="🔄️" Grid.Column="0" BackgroundColor="#aa000000" CornerRadius="8" BorderColor="Black" Clicked="SwitchCameraButton_Clicked" />
 
-			<!--<zxing:BarcodeGeneratorView
+			<zxing:BarcodeGeneratorView
 				x:Name="barcodeGenerator"
 				Grid.Column="1"
 				HorizontalOptions="Center"
@@ -36,7 +36,7 @@
 				ForegroundColor="DarkBlue"
 				Format="QrCode"
 				Value="Bla"
-				BarcodeMargin="1" />-->
+				BarcodeMargin="1" />
 
 			<Button Text="💡" Grid.Column="2" BackgroundColor="#aa000000" CornerRadius="8" BorderColor="Black" Clicked="TorchButton_Clicked" />
 		</Grid>

From d6eb72e2002d33a37d8ab4bfc326db6fb936e1e5 Mon Sep 17 00:00:00 2001
From: cwalker <chris.walker@nelnet.net>
Date: Fri, 23 Sep 2022 12:18:32 -0400
Subject: [PATCH 4/4] MainPage.xaml.cs changes

---
 BigIslandBarcode/MainPage.xaml.cs | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/BigIslandBarcode/MainPage.xaml.cs b/BigIslandBarcode/MainPage.xaml.cs
index cd486ec..5a6e38f 100644
--- a/BigIslandBarcode/MainPage.xaml.cs
+++ b/BigIslandBarcode/MainPage.xaml.cs
@@ -28,9 +28,8 @@ protected void BarcodesDetected(object sender, BarcodeDetectionEventArgs e)
 			{
 				var r = e.Results.First();
 
-				topText.Text = $"{r.Format.ToString()}: {r.Value}";
-				//barcodeGenerator.Value = r.Value;
-				//barcodeGenerator.Format = r.Format;
+				barcodeGenerator.Value = r.Value;
+				barcodeGenerator.Format = r.Format;
 			});
 		}