Using Core KTX

Core KTX includes packages built around a variety of core Android framework libraries and APIs, including the following:

• androidx.core.animation
• androidx.core.preference
• androidx.core.transition
• androidx.core.view

One of the best examples of using Android KTX to simplify platform APIs is in the use of SharedPreferences. With the functionality of Kotlin available to us, we can use a very fluent syntax for editing SharedPreferences that removes the need to explicitly call commit() or apply():

val preferences = getPreferences(Context.MODE_PRIVATE)
preferences.edit { 
    putBoolean("key", false) 
    putString("key2", "value")
}

Another example of useful functionality provided by Android KTX is the View.onPreDraw() extension function:

button.doOnPreDraw {
    // Perform an action when view is about to be drawn
}

This allows us to define a lambda containing logic that will be run when View is about to be drawn without having to create a new listener or having to unregister that listener.