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Resource Types

Each of the documents in this section describe the usage, format and syntax for a certain type of application resource that you can provide in your resources directory (res/).

Here's a brief summary of each resource type:

R.id Is Not a Resource

You will often use an R.id integer to handle View objects in your UI. Although the id is a subclass of the R class, it is not considered a "resource" because it is not a reference to an externalized application resource. The id is simply a unique identifier that allows you to handle elements in your UI by instantiating objects with findViewById().

For information about using R.id with your UI, see Declaring Layout.

Animation Resources
Define pre-determined animations.
Tween animations are saved in res/anim/ and accessed from the R.anim class.
Frame animations are saved in res/drawable/ and accessed from the R.drawable class.
Color State List Resource
Define a color resources that changes based on the View state.
Saved in res/color/ and accessed from the R.color class.
Drawable Resources
Define various graphics with bitmaps or XML.
Saved in res/drawable/ and accessed from the R.drawable class.
Layout Resource
Define the layout for your application UI.
Saved in res/layout/ and accessed from the R.layout class.
Menu Resource
Define the contents of your application menus.
Saved in res/menu/ and accessed from the R.menu class.
String Resources
Define strings, string arrays, and plurals (and include string formatting and styling).
Saved in res/values/ and accessed from the R.string, R.array, and R.plurals classes.
Style Resource
Define the look and format for UI elements.
Saved in res/values/ and accessed from the R.style class.
More Resource Types
Define values such as booleans, integers, dimensions, colors, and other arrays.
Saved in res/values/ but each accessed from unique R sub-classes (such as R.bool, R.integer, R.dimen, etc.).
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