Failed to start camera session about cameraview HOT 10 OPEN

I solved it by giving a delay of 500 mS while creating capture session because the camera configurations are not fully loaded until then, hence this delay.

void startCaptureSession() {
        if (!isCameraOpened() || !mPreview.isReady() || mImageReader == null) {
            return;
        }
        previewSize = chooseOptimalSize();
        mPreview.setBufferSize(previewSize.getWidth(), previewSize.getHeight());
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                try {
                    Surface surface = mPreview.getSurface();
                    mPreviewRequestBuilder = mCamera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
                    mPreviewRequestBuilder.addTarget(surface);
                    mCamera.createCaptureSession(Arrays.asList(surface, mImageReader.getSurface()),
                            mSessionCallback, mBackgroundHandler);
                } catch (CameraAccessException e) {
                    throw new RuntimeException("Failed to start camera session");
                }
            }
        }, 500);
    }

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Same on nexus 6p, android 7.1.1.
Right after authorising camera permission:
java.lang.RuntimeException: Failed to start camera session

Next calls work properly.

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It appeared on Nexus 5x for android 7.1.1 , after granting permission for Camera
java.lang.RuntimeException: Failed to start camera session at com.google.android.cameraview.Camera2.startCaptureSession(Camera2.java:462) at com.google.android.cameraview.Camera2$1.onOpened(Camera2.java:64) at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:134) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

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It appeared on LGE Nexus 5x for android O，API25 , after granting permission for Camera

java.lang.RuntimeException: Failed to start camera session
at com.google.android.cameraview.Camera2.startCaptureSession(Camera2.java:486)
at com.google.android.cameraview.Camera2$1.onOpened(Camera2.java:75)
at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:139)
at android.os.Handler.handleCallback(Handler.java:769)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6535)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

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I got this issue too on HuaWei Phone ， but only the fisrt time to use camera 。

Who know how to solve this bug ？

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@JeetSingh4 Thanks
Your solution solved my issue .

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Calling cameraView.start() on a delay also solved this issue for me but now I'm running into #11 instead.

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@zweinz buddy I hope this helps https://stackoverflow.com/questions/40146485/session-has-been-closed-further-changes-are-illegal/48019131#48019131

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@JeetSingh4 I am still facing issue even after using your solution

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@JeetSingh4 Crash that the mCamera will sometimes become null will happen in some devices like Mi and Huawei, so it need a prerequisite sentence before calling createCaptureRequest inside Runnable.

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