tested on windows, android, ios

samples/Plugin.Maui.Feature.Sample/App.xaml.cs

@@ -1,11 +1,11 @@
-namespace Plugin.Maui.Feature.Sample;
+namespace Plugin.Maui.Feature.Sample;
 
 public partial class App : Application
 {
-	public App()
-	{
-		InitializeComponent();
+    public App()
+    {
+        InitializeComponent();
 
-		MainPage = new AppShell();
-	}
-}
+        MainPage = new AppShell();
+    }
+}

samples/Plugin.Maui.Feature.Sample/MainPage.xaml

@@ -3,16 +3,27 @@
     x:Class="Plugin.Maui.Feature.Sample.MainPage"
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-    Title="Feature Plugin">
-
-    <!--  Add something that makes sense for your plugin here  -->
-    <Grid Padding="20">
-        <Label Text="Hello" />
+    Title="OCR Plugin">
+    <StackLayout Padding="20" Spacing="10">
         <Button
-            x:Name="RunOcrBtn"
-            Clicked="RunOcrBtn_Clicked"
+            x:Name="OpenFromCameraBtn"
             MaximumHeightRequest="100"
             MaximumWidthRequest="200"
-            Text="Run" />
-    </Grid>
+            Clicked="OpenFromCameraBtn_Clicked"
+            Text="From Camera .." />
+        <Button
+            x:Name="OpenFromFileBtn"
+            MaximumHeightRequest="100"
+            MaximumWidthRequest="200"
+            Clicked="OpenFromFileBtn_Clicked"
+            Text="From File .." />
+        <Label x:Name="ResultLbl" Text="Waiting for results .." HorizontalOptions="Center" />
+        <Button
+            IsEnabled="False"
+            x:Name="ClearBtn"
+            Clicked="ClearBtn_Clicked"
+            MaximumHeightRequest="100"
+            MaximumWidthRequest="200"
+            Text="Clear Result" />
+    </StackLayout>
 </ContentPage>

samples/Plugin.Maui.Feature.Sample/MainPage.xaml.cs

@@ -4,31 +4,78 @@ namespace Plugin.Maui.Feature.Sample;
 
 public partial class MainPage : ContentPage
 {
-    readonly IOcrService _feature;
+    readonly IOcrService _ocr;
 
     public MainPage(IOcrService feature)
     {
         InitializeComponent();
 
-        _feature = feature;
+        _ocr = feature;
     }
 
     protected override async void OnAppearing()
     {
         base.OnAppearing();
 
-        await _feature.InitAsync();
+        await _ocr.InitAsync();
     }
 
-    private async void RunOcrBtn_Clicked(object sender, EventArgs e)
+    private async void OpenFromCameraBtn_Clicked(object sender, EventArgs e)
     {
-        // load test.jpg and then run OCR on it
-        using var fileStream = await FileSystem.Current.OpenAppPackageFileAsync("test.jpg");
+        if (MediaPicker.Default.IsCaptureSupported)
+        {
+            var photo = await MediaPicker.Default.CapturePhotoAsync();
 
-        // read all bytes of the image from fileStream
-        var imageData = new byte[fileStream.Length];
-        await fileStream.ReadAsync(imageData, 0, imageData.Length);
+            if (photo != null)
+            {
+                // Open a stream to the photo
+                using var sourceStream = await photo.OpenReadAsync();
 
-        var result = await _feature.RecognizeTextAsync(imageData);
+                // Create a byte array to hold the image data
+                var imageData = new byte[sourceStream.Length];
+
+                // Read the stream into the byte array
+                await sourceStream.ReadAsync(imageData);
+
+                var result = await _ocr.RecognizeTextAsync(imageData);
+
+                ResultLbl.Text = result.AllText;
+
+                ClearBtn.IsEnabled = true;
+            }
+        }
+        else
+        {
+            await DisplayAlert(title: "Sorry", message: "Image capture is not supported on this device.", cancel: "OK");
+        }
+    }
+
+    private async void OpenFromFileBtn_Clicked(object sender, EventArgs e)
+    {
+        var photo = await MediaPicker.Default.PickPhotoAsync();
+
+        if (photo != null)
+        {
+            // Open a stream to the photo
+            using var sourceStream = await photo.OpenReadAsync();
+
+            // Create a byte array to hold the image data
+            var imageData = new byte[sourceStream.Length];
+
+            // Read the stream into the byte array
+            await sourceStream.ReadAsync(imageData);
+
+            var result = await _ocr.RecognizeTextAsync(imageData);
+
+            ResultLbl.Text = result.AllText;
+
+            ClearBtn.IsEnabled = true;
+        }
+    }
+
+    private void ClearBtn_Clicked(object sender, EventArgs e)
+    {
+        ResultLbl.Text = string.Empty;
+        ClearBtn.IsEnabled = false;
     }
 }

samples/Plugin.Maui.Feature.Sample/Platforms/Android/AndroidManifest.xml

@@ -1,6 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true">
+        <meta-data android:name="com.google.mlkit.vision.DEPENDENCIES" android:value="ocr" />
+    </application>
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 	<uses-permission android:name="android.permission.INTERNET" />
+    <queries>
+        <intent>
+            <action android:name="android.media.action.IMAGE_CAPTURE" />
+        </intent>
+    </queries>
 </manifest>

samples/Plugin.Maui.Feature.Sample/Platforms/Android/MainActivity.cs

@@ -1,10 +1,24 @@
-using Android.App;
+using Android.App;
 using Android.Content.PM;
 using Android.OS;
 
+// Needed for Picking photo/video
+[assembly: UsesPermission(Android.Manifest.Permission.ReadExternalStorage, MaxSdkVersion = 32)]
+[assembly: UsesPermission(Android.Manifest.Permission.ReadMediaAudio)]
+[assembly: UsesPermission(Android.Manifest.Permission.ReadMediaImages)]
+[assembly: UsesPermission(Android.Manifest.Permission.ReadMediaVideo)]
+
+// Needed for Taking photo/video
+[assembly: UsesPermission(Android.Manifest.Permission.Camera)]
+[assembly: UsesPermission(Android.Manifest.Permission.WriteExternalStorage, MaxSdkVersion = 32)]
+
+// Add these properties if you would like to filter out devices that do not have cameras, or set to false to make them optional
+[assembly: UsesFeature("android.hardware.camera", Required = true)]
+[assembly: UsesFeature("android.hardware.camera.autofocus", Required = true)]
+
 namespace Plugin.Maui.Feature.Sample;
 
 [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
 public class MainActivity : MauiAppCompatActivity
 {
-}
+}

samples/Plugin.Maui.Feature.Sample/Platforms/iOS/Info.plist

@@ -1,32 +1,40 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
-<dict>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>UIDeviceFamily</key>
-	<array>
-		<integer>1</integer>
-		<integer>2</integer>
-	</array>
-	<key>UIRequiredDeviceCapabilities</key>
-	<array>
-		<string>arm64</string>
-	</array>
-	<key>UISupportedInterfaceOrientations</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationPortraitUpsideDown</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>XSAppIconAssets</key>
-	<string>Assets.xcassets/appicon.appiconset</string>
-</dict>
+    <dict>
+        <key>LSRequiresIPhoneOS</key>
+        <true/>
+        <key>UIDeviceFamily</key>
+        <array>
+            <integer>1</integer>
+            <integer>2</integer>
+        </array>
+        <key>UIRequiredDeviceCapabilities</key>
+        <array>
+            <string>arm64</string>
+        </array>
+        <key>UISupportedInterfaceOrientations</key>
+        <array>
+            <string>UIInterfaceOrientationPortrait</string>
+            <string>UIInterfaceOrientationLandscapeLeft</string>
+            <string>UIInterfaceOrientationLandscapeRight</string>
+        </array>
+        <key>UISupportedInterfaceOrientations~ipad</key>
+        <array>
+            <string>UIInterfaceOrientationPortrait</string>
+            <string>UIInterfaceOrientationPortraitUpsideDown</string>
+            <string>UIInterfaceOrientationLandscapeLeft</string>
+            <string>UIInterfaceOrientationLandscapeRight</string>
+        </array>
+        <key>XSAppIconAssets</key>
+        <string>Assets.xcassets/appicon.appiconset</string>
+        <key>NSCameraUsageDescription</key>
+        <string>This app needs access to the camera to take photos.</string>
+        <key>NSMicrophoneUsageDescription</key>
+        <string>This app needs access to microphone for taking videos.</string>
+        <key>NSPhotoLibraryAddUsageDescription</key>
+        <string>This app needs access to the photo gallery for picking photos and videos.</string>
+        <key>NSPhotoLibraryUsageDescription</key>
+        <string>This app needs access to photos gallery for picking photos and videos.</string>
+    </dict>
 </plist>

samples/Plugin.Maui.Feature.Sample/Plugin.Maui.OCR.Sample.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
 		<TargetFrameworks>net8.0-android;net8.0-ios;net8.0-maccatalyst</TargetFrameworks>
@@ -30,6 +30,11 @@
 		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
 	</PropertyGroup>
 
+	<PropertyGroup Condition="'$(TargetFramework)'=='net8.0-ios'">
+	  <CodesignKey>Apple Development: Created via API (BQQPP4HLY2)</CodesignKey>
+	  <CodesignProvision>VS: WildCard Development</CodesignProvision>
+	</PropertyGroup>
+
 	<ItemGroup>
 		<!-- App Icon -->
 		<MauiIcon Include="Resources\AppIcon\appicon.svg" ForegroundFile="Resources\AppIcon\appiconfg.svg" Color="#512BD4" />
@@ -47,13 +52,18 @@
 		<MauiAsset Include="Resources\Raw\**" LogicalName="%(RecursiveDir)%(Filename)%(Extension)" />
 	</ItemGroup>
 
-	<ItemGroup>
-	  <None Remove="Resources\Raw\test.jpg" />
-	</ItemGroup>
-
 	<ItemGroup>
 	  <ProjectReference Include="..\..\src\Plugin.Maui.OCR\Plugin.Maui.OCR.csproj" />
 	  <ProjectReference Include="..\..\src\Plugin.Shared.OCR\Plugin.Shared.OCR.csproj" />
 	  <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" />
+      <PackageReference Include="Xamarin.AndroidX.Fragment.Ktx" Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">
+        <Version>1.6.2.2</Version>
+      </PackageReference>
+	</ItemGroup>
+
+	<ItemGroup Condition="'$(TargetFramework)' == 'net8.0-android'">
+	  <PackageReference Include="Xamarin.GooglePlayServices.MLKit.Text.Recognition">
+	    <Version>119.0.0.5</Version>
+	  </PackageReference>
 	</ItemGroup>
 </Project>

src/Plugin.Maui.OCR/OcrImplementation.android.cs

@@ -1,7 +1,9 @@
+using System.Diagnostics;
 using Android.Gms.Tasks;
 using Android.Graphics;
 using Android.Util;
 using Plugin.Shared.OCR;
+using Xamarin.Google.MLKit.Common;
 using Xamarin.Google.MLKit.Vision.Common;
 using Xamarin.Google.MLKit.Vision.Text;
 using Xamarin.Google.MLKit.Vision.Text.Latin;
@@ -43,6 +45,8 @@ public Task InitAsync(System.Threading.CancellationToken ct = default)
     {
         // Initialization might not be required for ML Kit's on-device text recognition,
         // but you can perform any necessary setup here.
+
+
         return Task.CompletedTask;
     }
 
@@ -53,7 +57,36 @@ public async Task<OcrResult> RecognizeTextAsync(byte[] imageData, System.Threadi
         using var inputImage = InputImage.FromBitmap(image, 0);
 
         using var textScanner = TextRecognition.GetClient(TextRecognizerOptions.DefaultOptions);
-        return ProcessOcrResult(await ToAwaitableTask(textScanner.Process(inputImage).AddOnSuccessListener(new OnSuccessListener()).AddOnFailureListener(new OnFailureListener())));
+
+        MlKitException? lastException = null;
+        var maxRetries = 5;
+
+        for (var retry = 0; retry < maxRetries; retry++)
+        {
+            try
+            {
+                // Try to perform the OCR operation
+                return ProcessOcrResult(await ToAwaitableTask(textScanner.Process(inputImage).AddOnSuccessListener(new OnSuccessListener()).AddOnFailureListener(new OnFailureListener())));
+            }
+            catch (MlKitException ex) when (ex.Message.Contains("Waiting for the text optional module to be downloaded"))
+            {
+                // If the specific exception is caught, log it and wait before retrying
+                lastException = ex;
+                Debug.WriteLine($"OCR model is not ready. Waiting before retrying... Attempt {retry + 1}/{maxRetries}");
+                await Task.Delay(5000);
+            }
+        }
+
+        // If all retries have failed, throw the last exception
+        if (lastException != null)
+        {
+            throw lastException;
+        }
+        else
+        {
+            throw new InvalidOperationException("OCR operation failed without an exception.");
+        }
+
     }
 
     private static Task<Java.Lang.Object> ToAwaitableTask(global::Android.Gms.Tasks.Task task)