This video will teach you how to decode android application into source files including Java source files. And build a new apk with changes to the resource files and it will brief about signing the modified apk package.\r \r Source links:\r \r 1. Install apktool in Linux:\r \r 2. Convert dalvik code to jar file using the below dex2jar utility.\r \r 3. decode jar file into java files using jd-gui\r