Android Question Is it possible to copy installed App?

[Beja]

I had this question roaming in my mind since long time.
Ok, the App is installed in the client's device and I immediately deleted the APK file.. now what's the possibility
that someone can hack the installed app and salvage some code, if not the whole project?

Thanks

 

[Erel]

It is not possible on non-rooted devices. On a rooted device it is indeed possible to get the compiled classes and decompile them (use obfuscation to make it more difficult).

 

[coslad]

With the tool 'lucky patcher' everyone can rebuild the apk file, as Erel said : you need root permission