c# - Android devices fail to handle large images in .net maui app, IOS devices are great - Stack Overflow

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I want to show large images to users, the images can get 5MB in size and easily get around 7000*7000. I get image in byte[] array from server.

There is no problem displaying it on IOS device, the only issue is with android device which gives a weird java error "Java.Lang.RuntimeException:Canvas: trying to draw too large(134640000bytes) bitmap."

I already have functionality to zoom in/out and move image in any direction. Can someone please help, I tried to look everywhere but found nothing.

Edit: I am getting bytes[] so loading image like this MainImage.Source = ImageSource.FromStream(() => new MemoryStream(imagebytes));

I want to show large images to users, the images can get 5MB in size and easily get around 7000*7000. I get image in byte[] array from server.

There is no problem displaying it on IOS device, the only issue is with android device which gives a weird java error "Java.Lang.RuntimeException:Canvas: trying to draw too large(134640000bytes) bitmap."

I already have functionality to zoom in/out and move image in any direction. Can someone please help, I tried to look everywhere but found nothing.

Edit: I am getting bytes[] so loading image like this MainImage.Source = ImageSource.FromStream(() => new MemoryStream(imagebytes));

• c#
• maui

Share Improve this question Follow edited Mar 13 at 12:59 Khushwinder Singh asked Mar 12 at 19:48 Khushwinder SinghKhushwinder Singh 2144 bronze badges 10

• Thanks Austin, but i looked at that and there is no solution, they have lots of issues similar to that opened, but people are saying implement platform specific code use some kind of bitmaps – Khushwinder Singh Commented Mar 12 at 20:05
• 1 How are we supposed to know what “weird Java error” is? Please read How to Ask before posting – Jason Commented Mar 13 at 1:06
• @KhushwinderSingh try this github/dotnet/maui/issues/18834#issuecomment-2664924970 – Bhavanesh N Commented Mar 13 at 6:10
• @KhushwinderSingh fix your question by adding the at least the error message. There is zero value in it, the way it is phrased right now. – H.A.H. Commented Mar 13 at 12:18
• 1 @KhushwinderSingh I removed my close vote, and upvoted your question. – H.A.H. Commented Mar 13 at 13:25

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2 Answers 2

Sorted by: Reset to default 3

I'm assuming you are using Image. When dealing with large images, FFImageLoading is your friend. Since you have not specified the extension of your image file, I'm going to post how you could load a SVG image and other formats like JPG:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft/winfx/2009/xaml"
             xmlns:ffimageloading="clr-namespace:FFImageLoading.Maui;assembly=FFImageLoading.Maui"
             xmlns:ffimageloadingsvg="clr-namespace:FFImageLoading.Maui;assembly=FFImageLoading.Maui">

<!--Use this one for SVG-->
    <ffimageloadingsvg:SvgCachedImage x:Name="MainImage" HorizontalOptions="Center" VerticalOptions="Center"/>

<!--Use this one for other formats like JPG-->
    <!--<ffimageloading:CachedImage x:Name="MainImage" HorizontalOptions="Center" VerticalOptions="Center"/>-->

</ContentPage>

You can change the source as you did before:

MainImage.Source = ImageSource.FromStream(() => new MemoryStream(imagebytes));

First, this is not a bug.

It is how the situation is with android, even more true for old devices.

I suggest alternative solution, that I used for android native code. The idea is that you do not need to display 7000x7000 image in first place.

What you would want to do is resize the image in memory, and then display the resized image. There are libraries that I use in android native code, that do this in one line.

So I would be surprised if SkiaSharp (or something similar) would lack this functionality. But on MAUI I have never used it. I apply resize (force limitations) at the back-end when the image is getting uploaded at first place.

Just an alternative point of view.

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