Book Image

Expert Delphi

By : Paweł Głowacki
Book Image

Expert Delphi

By: Paweł Głowacki

Overview of this book

Delphi is the most powerful Object Pascal IDE and component library for cross-platform native app development. It enables building natively compiled, blazingly fast apps for all major platforms including Android, iOS, Windows, Mac, and Linux. If you want to build server-side applications, create web services, and have clear GUIs for your project, then this book is for you. The book begins with a basic primer on Delphi helping you get accustomed to the IDE and the Object Pascal language and will then quickly move on to advanced-level concepts. Through this book, we’ll help you understand the architecture of applications and will teach you the important concepts of the FireMonkey library, show you how to build server-side services, and enable you to interact with the Internet of Things. Towards the end, you will learn to integrate your app with various web services and deploy them. By the end of the book, you will be able to build powerful, cross-platform, native apps for iOS and Android with a single code base.
Table of Contents (14 chapters)

The life of an app

An app is not a lonely island. It is always executed by the operating system, within bounds that it imposes. Depending on the type of the app, we could be interested in responding to different application lifecycle events that the operating system sends to it. Every operating system has a slightly different app lifecycle model, but in the case of mobile the most tricky part could be properly handling the situation when our apps move from foreground execution to background, and back.

FireMonkey provides common abstraction for handling an application lifecycle through different types of application events defined in the FMX.Platform unit:

TApplicationEvent = (FinishedLaunching, BecameActive, WillBecomeInactive, EnteredBackground, WillBecomeForeground, WillTerminate, LowMemory, TimeChange, OpenURL);

If we want to receive the app lifecycle events, we need...