Book Image

Delphi Cookbook - Second Edition

By : Daniele Teti
Book Image

Delphi Cookbook - Second Edition

By: Daniele Teti

Overview of this book

Delphi is a cross-platform Integrated Development Environment (IDE) that supports rapid application development for Microsoft Windows, Apple Mac OS X, Google Android, and Apple iOS. It helps you to concentrate on the real business and save yourself the pain of wandering amid GUI widget details, or having to tackle inter-platform incompatibilities. It also has a wide range of drag-and-drop controls, helping you code your business logic into your business model, and it compiles natively for desktop and mobile platforms. This book will teach you how to design and develop applications, deploy them on the cloud platform, and distribute them within an organization via Google Play and other similar platforms. You will begin with the basics of Delphi and get acquainted with JSON format strings, XSLT transformations, unicode encodings and various types of streams. We then move on to more advanced topics such as developing higher-order functions and using enumerators and RTTI. You will get an understanding of how Delphi RTL functions and how to use FireMonkey in a VCL application. We will then cover topics such as multithreading, using the parallel programming library and putting Delphi on a server. We will also take a look at the new feature of WebBroker Apache modules and then ride the mobile revolution with FireMonkey. By the end of the book, you will be able to develop and deploy cross-platform applications using Delphi .
Table of Contents (15 chapters)
Delphi Cookbook Second Edition
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Doing it in the background, the right way – Android services


In this recipe, we'll be introduced to the fantastic world of Android services! As you probably know, Android is multitasking from the very first version. Multitasking is not a simple thing for an operating system running on limited hardware. Let's think about the memory that could be allocated for days, or weeks, to some specific processes with the user that runs new apps over and over again. At some point, the memory will finish and the OS has to decide whether to prevent a new app from starting or to eliminate some old processes that the user hasn't used for a while. Obviously, the second option is the best; to allow new apps to run, the OS needs to free some memory still allocated to other apps. At this point, there is another question: which apps can be removed from the memory?

Let's leave this question unanswered for a moment and talk about the Android OS components. Android is a complex OS composed of a lot of different components...