Is it possible to build APK from source with in an android phone?

If you can manage to port the green bubbles to Android, you can get it done. It is not so simple though. <code>edit:</code> Well someone has done this: check the the other answer. <ul> <li> AAPT </li> <li> Compiler call </li> <li> dex (native) </li> <li> apkBuilder </li> <li> JarSigner </li> <li> zipAlign <img src="https://i.stack.imgur.com/I2har.png" alt="enter image description here"> </li> </ul>