How to save image to album of cellphone in maui ?

Question

Take picture or select and DownSize image then save it to FileSystem.CacheDirectory

now how can i copy it to album of cellphone on ios and android ?

Answer 1

Hello,

In MAUI, you can follow the steps below to save photo files to an album.

For iOS:

Step 1. Add the following permisson into plist.

<key>NSPhotoLibraryAddUsageDescription</key>
<string>Please allow access to save photo in your photo library</string>

Step 2. Create SavePictureService.cs in Platforms/iOS folder, and add the following code:

public static class SavePictureService
{
    public static void SavePicture(byte[] arr)
    {
        var imageData = NSData.FromArray(arr);
        var image = UIImage.LoadFromData(imageData);

        image.SaveToPhotosAlbum((img, error) =>
        {
        });
    }
}

For Android:

Step 1. Add the following code into MainActivity.cs:

public static MainActivity Instance { get; private set; } 

// Then, make the assignment in the OnCreate method.
Instance = this; 

Step 2. Create SavePictureService.cs in Platforms/Android folder, and add the following code:

public static class SavePictureService
{
    public static bool SavePicture(byte[] arr, string imageName)
    {
        var contentValues = new ContentValues();
        contentValues.Put(MediaStore.IMediaColumns.DisplayName, imageName);
        contentValues.Put(MediaStore.Files.IFileColumns.MimeType, "image/png");
        contentValues.Put(MediaStore.IMediaColumns.RelativePath, "Pictures/relativePath");
        try
        {
            var uri = MainActivity.Instance.ContentResolver.Insert(MediaStore.Images.Media.ExternalContentUri, contentValues);
            var output = MainActivity.Instance.ContentResolver.OpenOutputStream(uri);
            output.Write(arr, 0, arr.Length);
            output.Flush();
            output.Close();
        }
        catch (System.Exception ex)
        {
            Console.Write(ex.ToString());
            return false;
        }
        contentValues.Put(MediaStore.IMediaColumns.IsPending, 1);
        return true;
    }
}

For MAUI, you could invoke those services in TakePhoto method to save photo into album.

using Stream sourceStream = await photo.OpenReadAsync();
using FileStream localFileStream = File.OpenWrite(localFilePath);
// convert stream to byte[]
MemoryStream ms = new MemoryStream();
sourceStream.CopyTo(ms);
var b = ms.ToArray();
await sourceStream.CopyToAsync(localFileStream);

                // save photo into album.
#if ANDROID
                MauiApp22.Platforms.Android.SavePictureService.SavePicture(b, photo.FileName);
#elif IOS
                MauiApp22.Platforms.iOS.SavePictureService.SavePicture(b);
#endif

Best Regards,

Alec Liu.

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Answer 2

Thank you for the above, this is the correct answer. I am a bit later to the party, but I though it would be worth mentioning. iOS is very fussy and the only way to satisfy what I can only assume is another security feature was to invoke the save function on the main thread.

public static void SavePicture(byte[] arr)
{
    var imageData = NSData.FromArray(arr);
    var image = UIImage.LoadFromData(imageData);

    MainThread.BeginInvokeOnMainThread(() =>
    {
        image.SaveToPhotosAlbum((img, error) =>
        {
        });
    });
}