Image orientation and ExifInterface

Question

I want to get orientation of a bitmap. i use this code:

ExifInterface ei = new ExifInterface(photoPath);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,      
ExifInterface.ORIENTATION_NORMAL);

switch(orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
    rotateImage(bitmap, 90);
    break;
case ExifInterface.ORIENTATION_ROTATE_180:
    rotateImage(bitmap, 180);
    break;
// etc.
}

My problem is this line:

ExifInterface ei = new ExifInterface(photoPath);

in this code photoPath is an String but i don't have any String path! i have a Bitmap loaded in memory inside a Bitmap! how i can set the path for ExifInterface ?

score 0 · Answer 1 · answered Oct 13 '14 at 17:36

0

how i can set the path for ExifInterface ?

You don't.

However, you also do not have any EXIF headers by the time you wind up with a Bitmap.

If you are attempting to apply this to a photo taken by the camera, and that photo is in JPEG format, the byte[] representing the encoded photo can be passed to the readExif() method of an ExifInterface object (created from the zero-argument constructor):

ExifInterface exif=new ExifInterface();

exif.readExif(data);

Otherwise, you may wish to explain where this Bitmap comes from.

answered Oct 13 '14 at 17:36

CommonsWare

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In API 19 sources, I don't see any method called readExif(), nor the parameterless constructor. :-( – david.perez Oct 17 '14 at 06:41
@david.perez: Ah, excellent point. I thought I was forgetting something. In my camera library, I am not using the SDK's `ExifInterface`, but the similarly-named class from the AOSP messaging client: https://github.com/commonsguy/cwac-camera/tree/master/camera/src/com/android/mms/exif – CommonsWare Oct 17 '14 at 10:48

score 0 · Accepted Answer · edited May 23 '17 at 12:05

The first solution it's to create a temporary file and call the standard new ExifInterface(tempFile). I don't like it for inefficient
Other solution is given here, but you have to make your APK bigger, by adding 3rd party code.
The solution I've personally chosen is to rotate the image when it is captured to a temporary file, and then save it in a blog field of a Sqlite database. Then at view time, I don't need to handle the rotation, and the problem of not being able to read the EXIF headers, as I don't have a file.

score 0 · Answer 3 · answered Sep 20 '21 at 13:10

    private File createImageFile() throws IOException {
            // Create an image file name
            String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
            String imageFileName = "JPEG_" + timeStamp + "_";
            File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
            File image = File.createTempFile(
                    imageFileName,  /* prefix */
                    ".jpg",         /* suffix */
                    storageDir      /* directory */
            );
    
            // Save a file: path for use with ACTION_VIEW intents
            currentPhotoPath = image.getAbsolutePath();
            return image;
        }

    File file=createImageFile() 
    pass file to ExifInteface


   
 photoURI = FileProvider.getUriForFile(YourActivity.this, getApplicationContext().getPackageName() + ".provider", file);

Make sure you click on the same file path
 intent.putExtra(MediaStore.EXTRA_OUTPUT,photoURI);

Image orientation and ExifInterface

3 Answers3