android - 无法连接到 Android 中的相机服务

Question

从另一个 Activity 导航到相机 Activity 时出现异常“无法连接到相机服务”。问题出现在Camera.open()。我已经搜索了很多并尝试了可用的解决方案。但问题没有解决.请提供一些帮助。提前致谢。

 @Override
    public void surfaceChanged(final SurfaceHolder holder, int arg1,
            int arg2, int arg3) {


        cameraHandler = new Handler() {
            /*
             * (non-Javadoc)
             * 
             * @see android.os.Handler#handleMessage(android.os.Message)
             */
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                case LOADCAMERA:
                    if (null != mProgress) {
                        if (mProgress.isShowing()) {
                            mProgress.dismiss();
                        }
                    }
                    try {
                        try {

                            mCam = Camera.open(); // attempt to get a Camera
                                                    // instance
                        } catch (Exception e) {
                            Log.e("Exception", e.getMessage());
                        }
                        mCam.setPreviewDisplay(holder);
                        mCameraParameters = mCam.getParameters();
                        if (isFlashLightOn) {
                            mCameraParameters
                                    .setFlashMode(Parameters.FLASH_MODE_TORCH);
                        } else {
                            mCameraParameters
                                    .setFlashMode(Parameters.FLASH_MODE_OFF);
                        }
                        mCameraParameters.setPreviewSize(mVideoWidth,
                                mVideoHeight);
                        mCam.setParameters(mCameraParameters);
                        mCam.startPreview();
                        mCam.unlock();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }

                }
                super.handleMessage(msg);
            }
        };
        Message msg = new Message();
        msg.what = LOADCAMERA;
        cameraHandler.sendMessageDelayed(msg, 700);

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder arg0) {


        if (mCam != null) {
            mCam.stopPreview();
            mCam.setPreviewCallback(null);
            mCam.release();
            mCam = null;
        }

    }
}

添加日志猫

W/CameraService(   78): CameraService::connect X (pid 623) rejected (camera 0 is still      busy).
E/Exception(  623): Fail to connect to camera service
D/AndroidRuntime(  623): Shutting down VM
W/dalvikvm(  623): threadid=1: thread exiting with uncaught exception(group=0x40015560)
E/AndroidRuntime(  623): FATAL EXCEPTION: main
E/AndroidRuntime(  623): java.lang.NullPointerException
E/AndroidRuntime(  623):    at   com.gui.MainActivity$CameraPreview$1.handleMessage(MainActivity.java:2041)
E/AndroidRuntime(  623):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  623):    at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime(  623):    at  android.app.ActivityThread.main(ActivityThread.java:3683)
E/AndroidRuntime(  623):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  623):    at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(  623):    at    com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:845)
E/AndroidRuntime(  623):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:603)
E/AndroidRuntime(  623):    at dalvik.system.NativeStart.main(Native Method)
W/ActivityManager(  106):   Force finishing activity com.gui/.MainActivity
W/ActivityManager(  106):   Force finishing activity com.gui/.MainActivity
E/v4l2_utils(   78): Error = Try again from dqbuf
E/SEC_Overlay(   78): Failed to DQ/-1
E/CameraHardwareSec(   78): ERR(int    android::CameraHardwareSec::previewThread()):overlay dequeueBuffer fail
I/CameraHardwareSec(   78): int android::CameraHardwareSec::previewThreadWrapper():  calling mSecCamera->stopPreview() and waiting
I/CameraHardwareSec(   78): int android::CameraHardwareSec::previewThreadWrapper(): return from wait
I/CameraHardwareSec(   78): int android::CameraHardwareSec::previewThreadWrapper(): exiting
W/SecCamera(   78): int android::SecCamera::stopPreview(): doing nothing because m_flag_camera_start is zero
I/CameraHardwareSec(   78): virtual void android::CameraHardwareSec::release(): calling mPreviewHeap.dispose()
W/SecCamera(   78): int android::SecCamera::stopRecord(): doing nothing because     m_flag_record_start is zero
I/SecCamera(   78): DeinitCamera: m_cam_fd(15)
I/SecCamera(   78): DeinitCamera: m_cam_fd2(21)

Answer 1

CameraService::connect X (pid 623) 被拒绝(相机 0 仍处于忙碌状态)。

这意味着其他一些进程(应用程序)已经调用了“Camera.open”并且没有释放它。在它发布之前，您无法访问相机。

从另一个 Activity 导航到相机 Activity 时，“出现异常‘无法连接到相机服务’”是什么意思？

这是什么其他 Activity ，它是否访问相机？