reading android jpeg EXIF metadata from picture callback

Question

Background: I am writing a camera app for a messenger program. I cannot save the captured image to persistent disk at any time. The camera must support all orientations.

Answer 1

If you have a content:// type of Uri, android provides APIs through ContentResolver and there’s no need to use external libraries:

public static int getExifAngle(Context context, Uri uri) {
    int angle = 0;
    Cursor c = context.getContentResolver().query(uri,
            new String[] { MediaStore.Images.ImageColumns.ORIENTATION },
            null,
            null,
            null);

    if (c != null && c.moveToFirst()) {
        int col = c.getColumnIndex( MediaStore.Images.ImageColumns.ORIENTATION );
        angle = c.getInt(col);
        c.close();
    }
    return angle;
}

You can also read any other value you find in MediaStore.Images.ImageColumns, like latitude and longitude.

This currently doesn’t work with file:/// Uris but can be easily tweaked.