Android 相机抛出错误 E/Camera: Error 2 on ZxingScannerView.startCamera() in Nougat

Question

1. 我使用以下方法捕获图像：

   final Intent cameraIntent = new    Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   if (cameraIntent.resolveActivity(getPackageManager()) != null)
   startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);
   

2. onActivityResult，我将图像保留在 sdcard 上，然后调用自定义对话框，其中在 ViewGroup 中添加了 ZxingScannerView。

   final ViewGroup barcodeScanningFrame = (ViewGroup)
   findViewById(R.id.barcodeScanningFrame);
   ZxingScannerView mScannerView = new  ZXingScannerView(activityToDisplayDialogBox.getApplicationContext());
   barcodeScanningFrame.addView(mScannerView);
   mScannerView.setResultHandler(this);
   mScannerView.startCamera();
   

3. 在 mScannerView.startCamera(); 之后 我收到以下错误

   E/Camera: Error 2
   E/CameraPreview: java.lang.RuntimeException: cancelAutoFocus failed
                java.lang.RuntimeException: cancelAutoFocus failed
                    at   android.hardware.Camera.native_cancelAutoFocus(Native Method)
                    at android.hardware.Camera.cancelAutoFocus(Camera.java:1275)
                    at me.dm7.barcodescanner.core.CameraPreview.stopCameraPreview(CameraPreview.java:109)
                    at me.dm7.barcodescanner.core.CameraPreview.surfaceChanged(CameraPreview.java:61)
                    at android.view.SurfaceView.updateWindow(SurfaceView.java:630)
                    at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:161)
                    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
                    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2205)
                    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
                    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
                    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
                    at android.view.Choreographer.doCallbacks(Choreographer.java:686)
                    at android.view.Choreographer.doFrame(Choreographer.java:621)
                    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
                    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)
   E/CameraPreview: java.lang.RuntimeException: getParameters failed (empty parameters)
                java.lang.RuntimeException: getParameters failed (empty parameters)
                    at android.hardware.Camera.native_getParameters(Native Method)
                    at android.hardware.Camera.getParameters(Camera.java:1896)
                    at me.dm7.barcodescanner.core.CameraPreview.getOptimalPreviewSize(CameraPreview.java:188)
                    at me.dm7.barcodescanner.core.CameraPreview.setupCameraParameters(CameraPreview.java:119)
                    at me.dm7.barcodescanner.core.CameraPreview.showCameraPreview(CameraPreview.java:76)
                    at me.dm7.barcodescanner.core.CameraPreview.surfaceChanged(CameraPreview.java:62)
                    at android.view.SurfaceView.updateWindow(SurfaceView.java:630)
                    at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:161)
                    at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
                    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2205)
                    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
                    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6337)
                    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
                    at android.view.Choreographer.doCallbacks(Choreographer.java:686)
                    at android.view.Choreographer.doFrame(Choreographer.java:621)
                    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
                    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)
   

看起来启动相机拍摄图像的意图并没有释放相机。因为 mScannerView.startCamera() 如果我不这样做就可以正常工作：

 final Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    if (cameraIntent.resolveActivity(getPackageManager()) != null)
    startActivityForResult(cameraIntent, TAKE_PHOTO_CODE);

并直接启动自定义对话框：

我有所需的权限，上面的代码在棉花糖中运行良好。在上述场景中，只是牛轧糖设备向我抛出了这个错误。

请帮忙。谢谢你。