Java 正在旋转的垂直图像

我正在使用以下代码在我的应用程序中拍摄并保存照片：

    public void addPhoto(){
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                // Create the File where the photo should go
                File photoFile = null;
                try {
                    photoFile = createImageFile();
                } catch (IOException ex) {}

                // Continue only if the File was successfully created
                if (photoFile != null) {
                    Uri photoURI = FileProvider.getUriForFile(this,
                            BuildConfig.APPLICATION_ID,
                            photoFile);
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                    startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
             }

        }


        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if(requestCode==REQUEST_IMAGE_CAPTURE&&resultCode==RESULT_OK){

                Intent i = new Intent(Assignments.this, AddAssignment.class);
                i.putExtra("fileName", mCurrentPhotoPath);
                startActivity(i);
            }
        }

public Bitmap getImage(){
        int targetW;
        int targetH;

        // Get the dimensions of the bitmap
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(fileName, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;

        if(photoW>photoH){
            targetW=400;
            targetH=300;
        }else{
            targetW=300;
            targetH=400;

        }



        // Determine how much to scale down the image
        int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

        // Decode the image file into a Bitmap sized to fill the View
        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor;
        bmOptions.inPurgeable = true;

        Bitmap bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
        photo=bitmap;

        return(bitmap);

    }

然后，我使用以下代码缩放图像以创建较小尺寸的预览：

    public void addPhoto(){
            Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
                // Create the File where the photo should go
                File photoFile = null;
                try {
                    photoFile = createImageFile();
                } catch (IOException ex) {}

                // Continue only if the File was successfully created
                if (photoFile != null) {
                    Uri photoURI = FileProvider.getUriForFile(this,
                            BuildConfig.APPLICATION_ID,
                            photoFile);
                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
                    startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
            }
             }

        }


        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            if(requestCode==REQUEST_IMAGE_CAPTURE&&resultCode==RESULT_OK){

                Intent i = new Intent(Assignments.this, AddAssignment.class);
                i.putExtra("fileName", mCurrentPhotoPath);
                startActivity(i);
            }
        }

public Bitmap getImage(){
        int targetW;
        int targetH;

        // Get the dimensions of the bitmap
        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(fileName, bmOptions);
        int photoW = bmOptions.outWidth;
        int photoH = bmOptions.outHeight;

        if(photoW>photoH){
            targetW=400;
            targetH=300;
        }else{
            targetW=300;
            targetH=400;

        }



        // Determine how much to scale down the image
        int scaleFactor = Math.min(photoW/targetW, photoH/targetH);

        // Decode the image file into a Bitmap sized to fill the View
        bmOptions.inJustDecodeBounds = false;
        bmOptions.inSampleSize = scaleFactor;
        bmOptions.inPurgeable = true;

        Bitmap bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
        photo=bitmap;

        return(bitmap);

    }

---

我的问题是，如果拍摄的图像是垂直的，则图像会水平翻转。我不知道这到底发生在哪里，我希望能得到任何帮助。谢谢。

一些设备摄像头使用

Exif

标志。这是他们在自然旋转中存储它的地方，用一个旗子来代表它

下面是我为在内存中旋转位图而编写的一些代码。请酌情使用/申请

关于exif标志的信息：

助手方法：

private static float exifToDegrees(float exifOrientation) {
        // MAY NEED TO HANDLE THE OTHER FLAGS TOO, though I don't think android flips photos.
        if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) {
            return 90;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {
            return 180;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {
            return 270;
        }
        return 0;
    }

---

一些设备摄像头使用

Exif

标志。这是他们在自然旋转中存储它的地方，用一个旗子来代表它

下面是我为在内存中旋转位图而编写的一些代码。请酌情使用/申请

关于exif标志的信息：

助手方法：

private static float exifToDegrees(float exifOrientation) {
        // MAY NEED TO HANDLE THE OTHER FLAGS TOO, though I don't think android flips photos.
        if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) {
            return 90;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) {
            return 180;
        } else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) {
            return 270;
        }
        return 0;
    }

---

如果您的设备摄像头以这种方式工作，可能与“Exif”有关。而你并没有对此负责。如果您的设备摄像头以这种方式工作，可能与“Exif”有关。而你并没有对此负责。非常感谢。我是个大傻瓜，但谢谢你教我一些东西。@Mateuszplaza没问题。当我第一次遇到它时，它也让我感到困惑非常感谢。我是个大傻瓜，但谢谢你教我一些东西。@Mateuszplaza没问题。当我第一次遇到它时，它也让我感到困惑