There are many more items which you use to build a good Android application. Apart from coding for the application, you take care of various other resources like static content that your code uses, such as bitmaps, colors, layout definitions, user interface strings, animation instructions, and more. These resources are always maintained separately in various sub-directories under the res/ directory of the project.
Directory & Resource Type
<1> anim/
XML files that define property animations. They are saved in the res/anim/ folder and accessed from the R.anim class.
<2> color/
XML files that define a state list of colors. They are saved in res/color/ and accessed from the R.color class.
<3> 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.
<4> layout/
XML files that define a user interface layout. They are saved in res/layout/ and accessed from the R.layout class.
<5> 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.
<6> raw/
Arbitrary files to save in their raw form. You need to call Resources.openRawResource() with the resource ID, which is R.raw.filename to open such raw files.
<7> 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 the R.color class.
dimens.xml for dimension values, and accessed from the R.dimen class.
strings.xml for string values, and accessed from the R.string class.
styles.xml for styles, and accessed from the R.style class.
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