How to backup the installed application's .apk file?

Question

How to take backup the installed application's .apk file in device or emulator which we're using by programmatically. Thanks in Advance.

Answer 1

I am sure this kind of programming not possible (May be possible for rooted phone) , because just consider if this is possible then paid application's Apk can easily available in market in free of charge, so if this is the case then what does it mean to develop paid android application?

Even though, it is possible then i am really interested to learn this programming snippets.

Answer 2

Eventually, the Android OS is a Linux OS. If you have root access to your device, you can copy the protected files and do whatever you want with them.

The APK files are located in the /data folder.