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Stopping the camera preview

By jptsetung on Wed, 06/20/2018 - 08:32

Hello,

I would like to being able to stop the camera preview on android. Don't ask me why, it's just that at some moment I don't want to display it for a game. I know how to not show the camera preview, but the Vuforia SDK keep processing it in background and the device is getting very hot and consumes a lot of battery despite not showing the video.

 

So instead of jsut not showing the video background, I tried to really stop the camera this way :

CameraDevice.getInstance().stop(); CameraDevice.getInstance().deinit();

On my device (Sony Xperia Z5) it works fine, but on a S8, it makes a crash :

java.lang.IllegalStateException: Session has been closed; further changes are illegal.         at android.hardware.camera2.impl.CameraCaptureSessionImpl.checkNotClosed(CameraCaptureSessionImpl.java:665)         at android.hardware.camera2.impl.CameraCaptureSessionImpl.capture(CameraCaptureSessionImpl.java:172)         at com.vuforia.ar.pl.Camera2_Preview$AutofocusRunner.onCaptureCompleted(Camera2_Preview.java:605)         at java.lang.reflect.Method.invoke(Native Method)         at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)         at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)         at android.os.Handler.handleCallback(Handler.java:789)         at android.os.Handler.dispatchMessage(Handler.java:98)         at android.os.Looper.loop(Looper.java:164)         at android.os.HandlerThread.run(HandlerThread.java:65)

 

Any help on doing this ?

Hello jptsetung,

Which version of Vuforia are you using? Are you on Native or Unity - if Unity which version of Unity? Are you able to test this on any other devices?

Thanks,

Vuforia Support