Android GetImageStreamAsync returns null

[Dabbel]

Description

Calling GetImageStreamAsync returns null

Code

signaturePad = new SignaturePadView { StrokeWidth = Device.RuntimePlatform == Device.iOS ? 4 : 8, ClearText = "neu", CaptionText = "Hier unterschreiben", SignatureLineColor = Resources.Resources.ColorBrand, BackgroundColor = Color.White, StrokeColor = Color.FromHex("#999999"), VerticalOptions = LayoutOptions.FillAndExpand, HeightRequest = 300 };

var imgStream = await signaturePad.GetImageStreamAsync(SignatureImageFormat.Jpeg, Color.FromHex("#999999"), Color.White);

Expected Behavior

Should return stream or raise error if something goes wrong

Actual Behavior

Returns null

Basic Information

• Version with issue: 3.0.0
• Last known good version: N/A
• IDE: Visual Studio 2017 (15.8.6)
• Platform Target Frameworks:
  • Android: 8.1
  • Xamarin.Forms: 3.2.0.871581
• Target Devices:
  • Huawei P Smart

[jlandsberg]

Bump. This is broken. SignaturePad flat out wont return the image on Android and I cannot find a workaround. Is it going to be fixed? I spent a while trying to figure out whats up here. Tried using the native SignaturePadView with GetImage and still got nothing back. Tried loading the strokes from the Xamarin.forms project through a dependency service but bitmap comes back null as well.

In my Xamarin.forms project the app hangs and crashes in Android on GetImageStreamAsync but on iOS it works just fine.

[Dabbel]

Found the problem.

SignaturePad works as intended.

I used a popup control and reacted when it gets closed, at this time SignaturePadCanvasView is disposed and calling Xamarin.Controls.GetSize (View) results in the error.