The app images (png) in the drawable folder can easily be extracted with a zip tool.
Was thinking that an APK file would be more “closed”.
Is this normal?
Is there some way to fix this?
The app images (png) in the drawable folder can easily be extracted with a
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Absolutely.
No, because there is nothing to “fix”. Anybody capable of getting at your APK file is also capable of getting at your images wherever else they might be stored (e.g., downloaded from the Internet and cached in on-board flash). And anybody using normal SDK tools can take screenshots of your app and get at your images that way. Protecting images is a pointless exercise.