Open camera.

TakePhoto.java

    private void openCamera() {
        if (mCamera == null) {
            try {
                mCamera = Camera.open();
            } catch (RuntimeException e) {
                mCamera = null;
            }
        }
        if (mCamera == null) {
            MessageProxy.showError(this, R.string.msg_camera_invalid);
            finish();
            return;
        }

        final Camera.Parameters cameraParams = mCamera.getParameters();
        cameraParams.setPictureFormat(ImageFormat.JPEG);
        cameraParams.setRotation(90);
        cameraParams.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
        mCamera.setParameters(cameraParams);

        Camera.Size size = cameraParams.getPreviewSize();
        ViewGroup.LayoutParams params = mSurfaceView.getLayoutParams();
        params.height = mSurfaceView.getWidth() * size.width / size.height;
        mSurfaceView.setLayoutParams(params);

        if (mIsSurfaceReady) {
            startPreview();
        }
    }
    
    
    private void startPreview() {
        if (mCamera == null) {
            return;
        }
        try {
            mCamera.setPreviewDisplay(mSurfaceView.getHolder());
            mCamera.setDisplayOrientation(90);
            mCamera.startPreview();
        } catch (IOException e) {
            e.printStackTrace();
            BugReport.report(e);
        }
    }

    /**
     * 拍照
     */
    private void takePhoto() {
        if (mCamera == null || mWaitForTakePhoto) {
            return;
        }
        mWaitForTakePhoto = true;
        mCamera.takePicture(null, null, new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                onTakePhoto(data);
                mWaitForTakePhoto = false;
            }
        });
    }

    private void onTakePhoto(byte[] data) {
        FileOutputStream fos = null;
        try {
            String tempPath = mOutput + "_";
            fos = new FileOutputStream(tempPath);
            fos.write(data);
            fos.flush();
            PhotoActionHelper.clipImage(this)
                    .extra(getIntent())
                    .output(mOutput).input(tempPath)
                    .requestCode(Const.Request.CLIP_IMAGE).start();
        } catch (Exception e) {
            BugReport.report(e);
        } finally {
            IOUtils.close(fos);
        }
    }