Any discussions related to native (Android Studio, Xcode, Visual Studio) Vuforia Engine development.

How do I get call back when the image target was detected

Android Studio
August 4, 2022 - 6:14am #1

I was doing the project using vuforia native on android studio where the native api was called by JNI-C++ and then called by java-android, I want to get notification on android layer when the vuforia detects/loses the image target. 

I found out that on Unity API, we get the event of "OnTargetStatusUpdated" under "ObserverBehaviour" class which we can subscribe our own function to thus we can get the status when the observer status changed.

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Examples of Cloud Recognition for Android

April 9, 2022 - 2:59am #1

Hello, can you please provide the simplest examples of Cloud Recognition for Android? Just scanning for image and i.e. displying its name. Thanks.

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Vuforia Runtime Error on Android 9+

Android Studio
March 19, 2022 - 10:32am #1

When I run my app on an older phone (Android 7) using the previous version Vuforia 7, there is no error, but when running on Android 9+ I get the following runtime error:

No implementation found for void com.qualcomm.vuforia.VuforiaJNI.swig_module_init()

Not sure if this is due to the older versions of Vuforia not being compatible with newer versions of Android.

Topic locked

vuEngineStart crashing in Native Magic Leap Application

Microsoft Visual Studio
March 17, 2022 - 7:07am #1


so I'm using VS to develop a native app for the magic leap device,

I've successfully reached all the steps before the vuEngineStart function:

init vuforia, creating the engine, creating the device and the image observer... I'm getting the prompt to allow permission to use the camera and I accept it, the license is also ok.

but when I'm reaching to start the Engine via vuEngineStart call, I'm getting a fatal error, with the message: " Received on_device_unavailable ".

Topic locked

Image width problem when tracking pixel buffer image

February 9, 2022 - 6:32am #1
Topic solved


I'm trying to track image from pixel buffer (C API), according to this guide:


You can also choose to create an Image Target Observer from an image pixel buffer. To do this, the VuImageTargetBufferConfig needs to be configured with a pixelBuffer, bufferFormat, bufferSize, and targetName.

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VuforiaEngine.h file error in Xcode

January 28, 2022 - 3:44am #1

I had download SDK for iOS and now i am trying to install this in real device but i am getting error like 'VuforiaEngine/VuforiaEngine.h' file not found.


So could you please let me know how can i fix this issue.

Topic locked

How to remove water mark

January 18, 2022 - 7:45pm #1

How can I remove watermark now? I use SDK version 9.1.7 as below,

Topic locked

Custom 3D model in Android

January 6, 2022 - 8:50am #1

I would like to change the 3D object in the Native sample from astronaut to another object, but when I change object in GLESRenderer.cpp and also texture in VuforiaActivity nothing shows up. Is there any vector adjustment I need to do?

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Set Frame Rate

December 21, 2021 - 8:07am #1


I'm having a problem when I try to build an IOS app in Xcode.

As you can see in the screenshot, It seems that I have to set a preferred frame rate range in Unity but I don't Know how to set this value.

I'd really appreciate some help.


Topic locked

Test UWP sample with Visual Studio 2019 on Surface Go 2

December 20, 2021 - 5:03am #1



I'm using Vuforia  SDK10.3.2 and Visual Studio 2019,

and I trying to develop an app for Sorface Go 2 with Windows 10.


When I run the UWP sample on my coputer I found one error:



I suppose that one laptop is not suitable for these kinds of applications.

I tried to execute the exe file, on my Surface Go 2 but the program don't find some dlls.

What is the reason for this? Because when I test it in VisualStudio it works fine.


Topic locked