What is contained in Android resources and what data can be stored in them?

Android resources contain various external data for the application, such as images, text strings, sound files, styles, themes, UI layouts, etc., which are not embedded directly in the code. They allow separating data from application logic, simplify localization, and manage different device configurations (screen size, orientation, etc.).

In Android resources, you can store the following types of data:

• Strings: Text strings used in the application. Stored in strings.xml files.
• Dimensions: Sizes such as dp, sp, px. Stored in dimens.xml files.
• Colors: Color definitions in ARGB or RGB format. Stored in colors.xml files.
• Styles and Themes: Collections of attributes to define the appearance of UI elements and the application as a whole. Stored in styles.xml and themes.xml files.
• Layouts: XML files defining the structure of UI elements and their placement. Stored in the layout/ directory.
• Images and icons: PNG, JPEG, GIF, WebP formats, as well as vector resources. Stored in drawable/ and mipmap/ directories.
• Audio and video files: Audio and video resources. Stored in the raw/ directory.
• Custom XML files: Any other XML files used for configuration or data. Stored in the xml/ directory.
• Fonts: Font files (e.g., .ttf, .otf). Stored in the font/ directory.
• Animations: Definitions of animations (tween, frame, state list). Stored in anim/ and animator/ directories.

Access to resources is done through the generated R class, which contains static identifiers for each resource.

// Example of accessing a string resource
String appName = getResources().getString(R.string.app_name);

// Example of accessing an image
Drawable icon = getResources().getDrawable(R.drawable.app_icon);

// Example of loading a layout
setContentView(R.layout.activity_main);