Question about app data and storage

It's most likely stored as a resource in R.java belonging to that app. This is an interesting idea and if there is a way to extract files from R.java I'd be interested in learning about it too.

This might sound crazy but I bet the APK files aren't compressed so you could potentially open the app (apk) in a hex editor, locate the JPG header (......JFIF) and then extract the image jpg manually. The size of the JPG is stored in the header (6 bytes in front of the JFIF tag I think) so you could also calculate how many bytes after the header you need to grab.

Even apk are compressed, just find a way to decompress it and go after your picture.

If none of this makes sense I might have time to take a whack at it if you send me the apk.

I wrote a VB program that does this back in the day. I might be able to reuse some code.

 

I just did a little experiment with one of my apps. I took the apk file and renamed it to .zip and then extracted it. All the drawable resources were neatly placed into res/drawable. Looks like that's all you have to do.

 

I suppose it depends. You can probably install it on your phone without much hassle (just re-zip the file structure into apk, get it on your phone, install it).

What exactly are you up to? =)

 

Not entirely sure, but that might invalidate the signature. I think you can resign a package yourself though.