Watch video tutorial of this topic In this post i am going to explain what are the contents of an android project. After creating the first android project you can see that a number of folders are present in the project explorer window. Now i explain what is the purpose of each of them. 1. Src folder: In android there are mainly two components , first one is the activity and other one is the service. Activities are components which are visible to the user and those are occur in background and not visible to the user is called the services. Each activity in an android project related to two files, first one is the layout file which is an xml file that build the GUI part of the activity and other one is a java file corresponding to that activity. The src folder contain the package and that holds all the java class files associated with the application. 2. Gen folder: The gen folder contain all the generated java class file in your project. This folder mainly co...