Detect when the keyboard is visible and when not.

Common type converters for the Room library.

Start the App Settings Activity so that the user can change settings related to the application, such as permissions.

Use LiveData to determine the status of any permission (in the sample code below: the location permission). If the user grants the permission at any point, then we will get notified.

The snippets below can lock access to the app whenever the user leaves the app and comes back, with an optional timeout.

All the methods below need the location permission:

A very complete recipe that implements a RecyclerView that pulls in paginated data, using Retrofit, LiveData. It includes example models, adapter, viewholders, and a viewholder for displaying the network state in case of an error.

A class that is using the “normal” shared preferences for any device with an sdk < M and the EncryptedSharedPreferences for M and above.

A replacement for the mediator LiveData for triggering LiveData transformations.

It’s date formatting string time! This is the table you need for all simple date formatting in Java/Kotlin.

A LiveData class that has null value.

Handle session expirations and 401 error codes. The following code will be activated if the API responds with a 401 (no authentication). If there’s a token that should be renewed, we first renew the token and if this is successful we try the original request again.

A very complete recipe that implements a RecyclerView that pulls in paginated data, using Retrofit, LiveData. It includes example models, adapter, viewholders, and a viewholder for displaying the network state in case of an error.

Global error handling for REST requests.

A collection of Kotlin extension methods that simplify many common tasks related to strings.