在横向模式下使用相机以纵向进行预览

Question

每当我在横向模式下使用我的相机获取纵向视图时,我为纵向和横向模式准备了两种不同的布局.

就像我仍然在纵向模式下预览一样无论我在风景或肖像模式下使用相机,但是一旦我删除了这一行: mCamera.setDisplayOrientation(90); 我正在横向模式下预览,要么我在风景中使用相机,要么在纵向模式下使用相机

PreviewSurface.java:-

public class PreviewSurface extends SurfaceView implements
    SurfaceHolder.Callback {

        public static final String LOG_TAG = "CameraPreview";
        private SurfaceHolder mSurfaceHolder;

        private Camera mCamera;

        // Constructor that obtains context and camera
        @SuppressWarnings("deprecation")
        public PreviewSurface(Context context, Camera camera) {
            super(context);
            this.mCamera = camera;

            this.mSurfaceHolder = this.getHolder();
            this.mSurfaceHolder.addCallback(this);
            this.mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
            this.mSurfaceHolder.setFixedSize(100, 100);
        }

        @Override
        public void surfaceCreated(SurfaceHolder surfaceHolder) {
            try {       
                mCamera.setPreviewDisplay(surfaceHolder);
                mCamera.startPreview();

            } catch (IOException e) {
                // left blank for now
            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
            mCamera.stopPreview();
            mCamera.release();
        }

        @Override
        public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
                int width, int height) {

                // start preview with new settings
                try {
                mCamera.setDisplayOrientation(90);
                mCamera.setPreviewDisplay(surfaceHolder);
                mCamera.startPreview();
                } catch (Exception e) {
                // intentionally left blank for a test
            }
        }

Answer 1

我建议你使用:Configuration.ORIENTATION_LANDSCAPE来支持Landscape Preview

编辑答案:

@Override
    public void surfaceCreated(SurfaceHolder surfaceHolder) {
        try {       
            Camera.Parameters parameters = mCamera.getParameters();
            if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
                 parameters.set("orientation", "portrait");
                 mCamera.setDisplayOrientation(90);
                 parameters.setRotation(90);
            }
                 else {
                      // This is an undocumented although widely known feature
                      parameters.set("orientation", "landscape");
                      // For Android 2.2 and above
                      mCamera.setDisplayOrientation(0);
                      // Uncomment for Android 2.0 and above
                      parameters.setRotation(0);
            }
            mCamera.setPreviewDisplay(surfaceHolder);
            mCamera.startPreview();

        } catch (IOException e) {
            // left blank for now
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
        mCamera.stopPreview();
        mCamera.release();
    }

    @Override
    public void surfaceChanged(SurfaceHolder surfaceHolder, int format,
            int width, int height) {

        try {       
            Camera.Parameters parameters = mCamera.getParameters();
            if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE) {
                 parameters.set("orientation", "portrait");
                 mCamera.setDisplayOrientation(90);
                 parameters.setRotation(90);
                 mCamera.setPreviewDisplay(surfaceHolder);
                    mCamera.startPreview();
            }
                 else {
                      // This is an undocumented although widely known feature
                      parameters.set("orientation", "landscape");
                      // For Android 2.2 and above
                      mCamera.setDisplayOrientation(0);
                      // Uncomment for Android 2.0 and above
                      parameters.setRotation(0);
            }
            mCamera.setPreviewDisplay(surfaceHolder);
            mCamera.startPreview();

        } catch (IOException e) {
            // left blank for now
        }           
    }