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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。


Android拍照、摄像方向旋转的问题 代码具体解释