Programatically take a photo using Cameraview in Xamarin

Question

Good Day All

i am want to programatically take a photo . i am using CameraView from the CommunityToolkit like this

     <xct:CameraView  
        x:Name="cameraView"  
        CaptureMode="Photo"    
        FlashMode="Auto" CameraOptions="Front"   
        HorizontalOptions="FillAndExpand"  
        MediaCaptured="CameraView_MediaCaptured"  
        OnAvailable="CameraView_OnAvailable"  
        VerticalOptions="FillAndExpand" />  
        </StackLayout>  

and on page load

 public Gallery( )  
    {  
        InitializeComponent();   
      cameraView.Shutter();  
   }  

and i was hoping to trap that image in

 private void CameraView_MediaCaptured(object sender, Xamarin.CommunityToolkit.UI.Views.MediaCapturedEventArgs e)  
    {  
  
    }  

Thanks

Answer 1

Hello,

You need to add a button and call cameraView.Shutter(); in the click event of button:

   <Button x:Name="doCameraThings" Clicked="DoCameraThings_Clicked" IsEnabled="False" Text="Snap picture" />  
     
   void DoCameraThings_Clicked(object sender, EventArgs e)   
   {  
       cameraView.Shutter();  
   }  

and i was hoping to trap that image in private void CameraView_MediaCaptured.

Please refer to this official sample code CameraViewPage.xaml.cs to get more details about how to use CameraView_MediaCaptured method.

Update:

Thanks for your sample.

You could use DependencyService to save the photo in the CameraView_MediaCaptured method.

Create interface:

   public interface ISaveService   
   {  
       void SaveFile(string fileName, byte[] data);  
   }  

Implement the interface on Android platform:

   [assembly: Xamarin.Forms.Dependency(typeof(SaveService))]   
   namespace AutoCameraViewDemo.Droid  
   {  
       public class SaveService : ISaveService  
       {  
           void ISaveService.SaveFile(string fileName, byte[] data)  
           {  
               ContentValues values = new ContentValues();  
               values.Put(MediaStore.IMediaColumns.MimeType, "image/jpeg");  
               values.Put(MediaStore.IMediaColumns.DateAdded, Java.Lang.JavaSystem.CurrentTimeMillis());  
               values.Put(MediaStore.IMediaColumns.DisplayName, fileName);  
               var cr = MainActivity.Instance.ContentResolver; // create a public static MainActivity Instance property and use the Instance=this assignment at the end of the OnCreate method in the MainActivity.cs file  
               var u = cr.Insert(MediaStore.Images.Media.ExternalContentUri, values);  
               var s = cr.OpenOutputStream(u);  
               s.Write(data, 0, data.Length);  
               s.Close();  
     
               values.Clear();  
               values.Put(MediaStore.IMediaColumns.IsPending, false);  
               cr.Update(u, values, null, null);  
           }  
       }  
   }  

Invoke this method:

   private void CameraView_MediaCaptured(object sender, Xamarin.CommunityToolkit.UI.Views.MediaCapturedEventArgs e)   
   {  
       byte[] image = e.ImageData;  
       DependencyService.Get<ISaveService>().SaveFile("test.jpg", image);  
   }  

Best Regards,

Alec Liu.

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