Many apps can use the default Android font, Roboto. However, often clients will have a branded font that must be used that is not included in Android. Luckily, XML fonts (API 16+) solve this issue very neatly. However, these fonts can only be bold, or not bold, yet many fonts have semibold / semilight variants that need to be supported.
By default, new Android projects have an ActionBar at the top (also known as a title bar), which usually contains a title, an optional back button on the left, and optional action(s) on the right. For many cases, minor customisations to colour are enough, but if a project requires exactly meeting a client’s design more advanced functionality will need to be utilised.
This tutorial will walk through the steps needed to turn a default ActionBar into a fully customised area of the screen, whilst keeping useful functionality like displaying a back button intact. Kotlin is used for this sample project, but all code can be easily converted to Java.