This package is not Android-specific, and can be used across platforms. However, for a good example of use in Android, take a look at kotlin-components-starter.

This package is meant to contain a collection of useful extensions on both the standard library and the Java standard library.

• kotlin-observable - Observable properties and lists
• kotlin-networking - Convenient networking with OkHTTP
• kotlin-anko - Android layouts with Anko
• kotlin-anko-view-controllers - Replace activites with a more convenient alternative, view controllers. Removes all of the struggles of retaining data between view creations and passing information to different screens.
• kotlin-anko-observable - Combining Anko with Observables
• kotlin-anko-networking - Combining Anko with networking
• kotlin-anko-full - Uses all of the above packages
• kotlin-components-starter - Example Android project

Minimality: When possible, these libraries don't create new structure. Instead, they use extension functions to let you use current objects and classes in a more convenient and expected way.

Complete reuse: Everything that is commonly used should be included, preferably as an inline extension function to reduce the app's method count.

Intuitiveness: Use inline extension functions to make common tasks simple, such as requesting a photo from the organization. In standard Android, doing this properly would take at least a large file by itself. We have extension functions that do it in one line.

• Extension functions for using collections of lambdas as events
• A disposable interface for objects that need to do something when you're done with them (usually to remove references to enable garbage collection)
• String extension functions
• InputStream extension functions for putting all of the output into a ByteArray or String
• Range extension functions for getting a random number within a numerical range
• Math for angles and advanced rounding
• Lifecycles - a system for consistently defining start/stops for lifecycles and listeners to them. Used extensively with Android in the kotlin-anko repository.
• Lambda - currently, a lambda extension function which puts a cooldown on a lambda. More to come.
• Files - File.child("text")
• Dates - Date.toCalendar(), get and set month/year/day/minute/second/hour on Calendar
• Collections
  • Cache - a map which, when an unavailable key is requested, it will automatically generate and enter a value.
  • Various mapping functions, which wrap a real collection. Each one is <Collection>.mapping{...} or some other verb with "ing" on the end, so as to not cause confusion the functions that actually create a new collection.
• ByteArray to and from a string using hex
• Async package, which includes
  • <lambda>.invokeAsync(...){ /*ui thread callback*/ }