Android拍照、摄像方向旋转的问题 代码具体解释

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。