java.lang.IllegalStateException: Session has been closed; further changes are illegal.

[vanniktech]

When calling cameraView.start(); I get the following exception:

java.lang.IllegalStateException: Session has been closed; further changes are illegal.
at android.hardware.camera2.impl.CameraCaptureSessionImpl.checkNotClosed(CameraCaptureSessionImpl.java:606)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:227)
at com.google.android.cameraview.Camera2$3.onConfigured(Camera2.java:132)
at java.lang.reflect.Method.invoke(Native Method)
at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

Note: I'm not calling it in onResume. Rather after the Camera permisison has been granted.

[vanniktech]

Seems like this is happening when the views visibility is initially set to GONE

[ungesehn]

I am facing the same issue when trying the sample: on first start after granting permission the app crashes. Subsequent starts are successful and the app is working as expected. I added a longer logcat output from my device - Sony Xperia Z3 / running on Android 6.0.1

9-17 17:11:19.133 31706-31783/com.google.android.cameraview.demo I/OpenGLRenderer: Initialized EGL, version 1.4
09-17 17:11:19.258 31706-31706/com.google.android.cameraview.demo I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@8d59087 time:634371044
09-17 17:11:22.079 31706-31706/com.google.android.cameraview.demo I/CameraManagerGlobal: Connecting to camera service
09-17 17:11:22.143 31706-31712/com.google.android.cameraview.demo W/art: Suspending all threads took: 16.824ms
09-17 17:11:22.161 31706-31706/com.google.android.cameraview.demo I/CameraManager: Using legacy camera HAL.
09-17 17:11:22.669 31706-31706/com.google.android.cameraview.demo D/MainActivity: onCameraOpened
09-17 17:11:22.675 31706-31706/com.google.android.cameraview.demo I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
09-17 17:11:22.675 31706-32161/com.google.android.cameraview.demo I/RequestThread-0: Configure outputs: 2 surfaces configured.
09-17 17:11:22.675 31706-32161/com.google.android.cameraview.demo D/Camera: app passed NULL surface
09-17 17:11:22.680 31706-32161/com.google.android.cameraview.demo I/RequestThread-0: configureOutputs - set take picture size to 5248x3936
09-17 17:11:22.746 31706-31706/com.google.android.cameraview.demo I/CameraDeviceState: Legacy camera service transitioning to state IDLE
09-17 17:11:22.757 31706-31706/com.google.android.cameraview.demo I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
09-17 17:11:22.758 31706-32161/com.google.android.cameraview.demo I/RequestThread-0: Configure outputs: 2 surfaces configured.
09-17 17:11:22.758 31706-32161/com.google.android.cameraview.demo D/Camera: app passed NULL surface
09-17 17:11:22.760 31706-32161/com.google.android.cameraview.demo W/RequestThread-0: configureOutputs - Will need to crop picture 2048x1536 into smallest bound size 1600x1200
09-17 17:11:22.761 31706-32161/com.google.android.cameraview.demo I/RequestThread-0: configureOutputs - set take picture size to 2048x1536
09-17 17:11:22.780 31706-31706/com.google.android.cameraview.demo I/CameraDeviceState: Legacy camera service transitioning to state IDLE
09-17 17:11:22.783 31706-31706/com.google.android.cameraview.demo W/PathParser: Points are too far apart 4.000000596046461
09-17 17:11:22.786 31706-31706/com.google.android.cameraview.demo D/AndroidRuntime: Shutting down VM
09-17 17:11:22.787 31706-31706/com.google.android.cameraview.demo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.google.android.cameraview.demo, PID: 31706
java.lang.IllegalStateException: Session has been closed; further changes are illegal.
at android.hardware.camera2.impl.CameraCaptureSessionImpl.checkNotClosed(CameraCaptureSessionImpl.java:606)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:227)
at com.google.android.cameraview.Camera2$3.onConfigured(Camera2.java:132)
at java.lang.reflect.Method.invoke(Native Method)
at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:234)
at android.app.ActivityThread.main(ActivityThread.java:5526)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

[stoyicker]

Note that this also seems to happen when you put your .stop call AFTER the super call in your onPause, instead of before. Could be the issue here as well.

[gilshallem]

Same problem happen to me on nexus 5x 7.0. stoyicker solution doesn't work

[Ghedeon]

Happens to me if you lock/unlock the screen. Same code added to a different empty Activity works just fine. Yet didn't find what so special about the first one.

[arriolac]

Seeing this as well. Happens specifically when the camera view is hidden (in my case, the camera view is behind another view which is shown later after the user taps a button).

[arriolac]

When I remove the callback in mPreview I no longer get this exception (i.e. remove https://github.com/google/cameraview/blob/master/library/src/main/api21/com/google/android/cameraview/Camera2.java#L191...L196). Is this safe to remove or would that have unintended consequences?

[TarekAshrafAhmed]

try to update to compile "com.android.support:support-v4:25.2.0"
finally it worked with me

[oyra]

I can see the pull request, but is it going to be merged? The bug still exists

[instantiator]

It seems like this was occurring for me when I setVisibility(VISIBLE) and then immediately attempted to start() the CameraView. My workaround: do the visibility change and post the start() to allow it time for the view to be ready.

view_main_camera.setVisibility(VISIBLE);
view_main_camera.post(new Runnable() {
  @Override
  public void run() {
    view_main_camera.start();
  }
});

Seems to work!

[jmarkstar]

Well, after try many ways, I got a kind of solution.

I just wanted when I stop the camera, I also want to hide the CameraView.

My first trying was like that, and I got the issue Session has been closed; further changes are illegal.

mCameraView.setVisibility(View.VISIBLE);
mCameraView.start();

mCameraView.stop();
mCameraView.setVisibility(View.GONE);

Then, I just had a look at the callback CameraView.Callback and I realised that it has two methods onCameraOpened() and onCameraClosed(). I just put the setVisibles in those methods and I didn't get more issues anymore.

private CameraView.Callback mCallback = new CameraView.Callback() {

        @Override public void onCameraOpened(CameraView cameraView) {
            Timber.v("onCameraOpened");
            mCameraView.setVisibility(View.VISIBLE);
        }

        @Override public void onCameraClosed(CameraView cameraView) {
            Timber.v("onCameraClosed");
            mCameraView.setVisibility(View.GONE);
        }

        @Override public void onPictureTaken(CameraView cameraView, final byte[] data) {}
}

Sorry for my english.

[ivanTrogrlic]

I guess some devices don't support some aspect ratios. The default aspect ratio is 4:3 and I was getting this error on LG G4. I tried changing the aspect ratio in onCameraOpened callback to 16:9 and it worked fine.

The code:

    @Override
    public void onCameraOpened(CameraView cameraView) {
        mCameraView.setAspectRatio(AspectRatio.of(16, 9));
    }

Edit: Actually, just set the aspectRatio before starting the camera.

[vanniktech]

Ended up switching to Fotoapparat.

[zweinz]

Was this closed just because the reporter ended up using a different solution? I'm still seeing this in my own project running on a Pixel.

[einschneidend]

No success here, what I had to do (no time as always) is that I implemented a onCrash() callback
so if it happens, I restart the camera activity and now all works well.

Yes yes, I know.