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NULL reference exception on takePicture()

See original GitHub issue

I only got this error on my Huawei Ascend P7 device and not on a Samsung Galaxy S5. When taking a picture, it crashes.

mTakePicture.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (mCameraView.isCameraOpened()) {
            mCameraView.takePicture();
        }
    }
});

mCameraView.addCallback(new CameraView.Callback() {
    @Override
    public void onPictureTaken(CameraView cameraView, byte[] data) {
        super.onPictureTaken(cameraView, data);
        mListener.onPictureTaken(data); // Custom method to process the data
        mCameraView.stop();
        getActivity().getSupportFragmentManager().popBackStack();
    }
});

When deleting the following line it works, however I need to close the camera fragment. getActivity().getSupportFragmentManager().popBackStack();

This is the error:

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.hardware.camera2.CameraCaptureSession.capture(android.hardware.camera2.CaptureRequest, android.hardware.camera2.CameraCaptureSession$CaptureCallback, android.os.Handler)' on a null object reference
    at com.google.android.cameraview.Camera2.unlockFocus(Camera2.java:625)
    at com.google.android.cameraview.Camera2.access$900(Camera2.java:45)
    at com.google.android.cameraview.Camera2$6.onCaptureCompleted(Camera2.java:609)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
    at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5569)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:931)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:726)

My guess is that I need to listen to another callback before killing the camera, but I couldn’t find one.

Issue Analytics

State:
Created 7 years ago
Reactions:11
Comments:11

Top GitHub Comments

4reactions

siokagamicommented, Jun 24, 2019

Just added
catch (NullPointerException n) {
            n.printStackTrace();
        }
to method unlockFocus() in Camera2.java class Dirty trick, but works.

Really work for me！！！！

4reactions

M0N3commented, Oct 11, 2018

Just added

catch (NullPointerException n) {
            n.printStackTrace();
        }

to method unlockFocus() in Camera2.java class Dirty trick, but works.

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