近期做了个拍照、摄像的应用。遇到了拍照、摄像的图像相对于现实。翻转了90度。原因：相机这个硬件的角度是横屏的角度，所以会出现都是横屏的。

1.照相、摄影预览图像的正确角度显 示：

    public static void setCameraDisplayOrientation(Activity activity,

            int cameraId, android.hardware.Camera camera) {

        android.hardware.Camera.CameraInfo info =

                new android.hardware.Camera.CameraInfo();

        android.hardware.Camera.getCameraInfo(cameraId, info);

        int rotation = activity.getWindowManager().getDefaultDisplay()

                .getRotation();

        int degrees = 0;

        switch (rotation) {

            case Surface.ROTATION_0: degrees = 0; break;

            case Surface.ROTATION_90: degrees = 90; break;

            case Surface.ROTATION_180: degrees = 180; break;

            case Surface.ROTATION_270: degrees = 270; break;

        }

        int result;

        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

            result = (info.orientation + degrees) % 360;

            result = (360 - result) % 360;  // compensate the mirror

        } else {  // back-facing

            result = (info.orientation - degrees + 360) % 360;

        }

        camera.setDisplayOrientation(result);

    }

改方法动态获取手机是Landscape（横屏）或Portrait(竖屏）来更改预览图。

（后屏的cameraId是0 ）

2.图像保存的正确角度（当我们拍下照片，发现角度又不正确）

@Override

   public void onPictureTaken(byte[] data, Camera camera) {

	        try {

	                  Bitmap realImage = BitmapFactory.decodeByteArray(data, 0, data.length);

	                  android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();

	                  android.hardware.Camera.getCameraInfo(0, info);

	                  Bitmap bitmap = rotate(realImage, info.orientation);

	                  FileOutputStream fos = new FileOutputStream(pictureFile);

	                  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);

	                  fos.close();                

//	            FileOutputStream fos = new FileOutputStream(pictureFile);

//	            fos.write(data);

//	            fos.close();

	            DBRecordAdapter.getInstance().insertRecord(bean);

	        } catch (FileNotFoundException e) {

	            Log.d(TAG, "File not found: " + e.getMessage());

	        } catch (IOException e) {

	            Log.d(TAG, "Error accessing file: " + e.getMessage());

	        }

}

3.录像回放的正确的方向：

		mMediaRecorder.setOrientationHint(90);

该方法在prepare（）之前调用。