Project Structure

1)AndroidManifest.xml----
   provides essential information about your app to the Android system
   1) names the Java package for the application (Package name --Unique id for the app)
    2) components of the app--activities, services, broadcast receivers, and content providers
    3) Permissions,android minimum level of android api , Libraries needed


2)src/java     ---------------- Source code for java files

3)res ------------------------- Resource files
   drawable/=images
   layout/= descriptions of GUI layout
   menu /= overall app menu options
   values/=constant values and arrays
   strings/= localization data
   styles/= general appearance styling

4) Gradle --Build or compile management system