Book Image

Kotlin Programming By Example

By : Iyanu Adelekan
Book Image

Kotlin Programming By Example

By: Iyanu Adelekan

Overview of this book

Kotlin greatly reduces the verbosity of source code. With Google having announced their support for Kotlin as a first-class language for writing Android apps, now's the time learn how to create apps from scratch with Kotlin Kotlin Programming By Example takes you through the building blocks of Kotlin, such as functions and classes. You’ll explore various features of Kotlin by building three applications of varying complexity. For a quick start to Android development, we look at building a classic game, Tetris, and elaborate on object-oriented programming in Kotlin. Our next application will be a messenger app, a level up in terms of complexity. Before moving onto the third app, we take a look at data persistent methods, helping us learn about the storage and retrieval of useful applications. Our final app is a place reviewer: a web application that will make use of the Google Maps API and Place Picker. By the end of this book, you will have gained experience of of creating and deploying Android applications using Kotlin.
Table of Contents (12 chapters)

Working with internal storage

This is an available storage medium on the Android application framework that empowers developers to store private data on a device's memory. As the word private implies, other applications cannot access the data stored by an app via internal storage. In addition, these files will be removed from storage when that app is uninstalled.

Writing files to internal storage

In order to create a private file on internal storage, it is necessary to call openFileOutput(). The openFileOutput() function takes two arguments. The first is the name (in form of a String) of the file to open and the second is the operating mode. Note that openFileOutput() must be called within an instance of Context, such...