Organize resource in Android

Directory	Resource Type
anim/	XML files that define property animations. They are saved in res/anim/ folder and accessed from the R.anim class.
color/	XML files that define a state list of colors. They are saved in res/color/ and accessed from the R.color class.
drawable/	Image files like .png, .jpg, .gif or XML files that are compiled into bitmaps, state lists, shapes, animation drawable. They are saved in res/drawable/ and accessed from the R.drawable class.
layout/	XML files that define a user interface layout. They are saved in res/layout/ and accessed from the R.layout class.
menu/	XML files that define application menus, such as an Options Menu, Context Menu, or Sub Menu. They are saved in res/menu/ and accessed from the R.menu class.
raw/	Arbitrary files to save in their raw form. You need to callResources.openRawResource() with the resource ID, which isR.raw.filename to open such raw files.
values/	XML files that contain simple values, such as strings, integers, and colors. For example, here are some filename conventions for resources you can create in this directory − arrays.xml for resource arrays, and accessed from the R.array class. integers.xml for resource integers, and accessed from the R.integer class. bools.xml for resource boolean, and accessed from the R.bool class. colors.xml for color values, and accessed from theR.color class. dimens.xml for dimension values, and accessed from the R.dimen class. strings.xml for string values, and accessed from theR.string class. styles.xml for styles, and accessed from the R.styleclass.
xml/	Arbitrary XML files that can be read at runtime by callingResources.getXML(). You can save various configuration files here which will be used at run time.