Android image resizing and preserving EXIF data (orientation, rotation, etc.)

Question

If your Android app uses the device camera to take a picture and then resizes it (this is very, very common to reduce the size for upload), you might not realize that this r

Answer 1

Why not just modify the ExifInterface source and add your own implementation to support reading/writing in bulk so you don't have to specify tag by tag. Here is a snippet of what I would do.

Add new method to expose the internal attributes:

public HashMap[] getAllAttributes() {
    return mAttributes;
}

Add new method to set all the attributes:

public void setAttributes(HashMap[] attributes) {
    for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
        mAttributes[i] = attributes[i];
    }
}

Then use it like this to preserve Exif and save to another File

// Grab all the original exif attributes from an image file and save to memory or wherever
let attributes = ExifInterface2(sourceImagePath).attributes

// Later on you can just copy those attributes to another image
ExifInterface2(destImagePath)
    .setAttributes(attributes)
    .saveAttributes();