When you create new android project from eclipse editor you found that
there are lots of directories created for android application lets us
understand all these directory.
Let us start from the top directory the top most directory is src directory.
SRC Directory
The src Directory contains the java files inside package.
gen Directory
The gen directory contains folder that are generated for us by the
toolset. one of the best thing you will find in gen directory is R.java
file. R.java file update automatically by the system whenever you add or
remove the design object or anything. in straight forward way whatever
you add or remove from your project will be update in R.java file.
Android 1.5 or X.X
This folder is associate with the SDK version this is the thing that
we have to configure when we create new project of android application.
assets
the assets folder provides repository for your resource which are using
by your android application. for eg if your android application has
sound effect then you can put those sound files in this folder but you
can't put image files in this folder because we have another folder for
images like stuff.
bin
Every program gets compiled and generate binary files same way android
program also gets compiled and generate binary files. android bin folder
contains the compiled binary files.
res
the res folder doesn't contain any files but it is one of the most
important directory in android application. let us see what kind of
directory res folder has.
res/drawable
Drawable folder contains images. there are three kind of screen density.
you can specify same three images for different screen density. for eg res/drawable-hdpi
contains
all your image resources for high-resolution devices. you don't need
to specify which density images to pick when but operating system will
choose it at run time.
res/layout
the layout folder is where you put your main.xml file. all design resources are stored in this folder.
res/values
values folder contains string resource. mostly its in key value pair. some common file is strings.xml
AndroidManifest.xml:
The manifest file is responsible for providing essential information to
the operating system about a particular application. for e.g. used to specify the default activity to launch.
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