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An Introduction to Android 7.0 Nougat
文章来源:www.biyezuopin.cc   发布者:毕业设计网站   发布时间:2018-12-26 10:03:45   阅读:124
e of open source translates directly to more sales of more consumer electronics devices in more areas of your potential customer’s lives, and this offers steadily increasing Android market share, and an ever-increasing incentive to develop for the Android 7.1.1 OS over “closed” technologies such as Windows or iOS, and over less popular and less prolific PC OSes, such as OS/X, Open Solaris, and Linux distributions.

 

In addition to being free for commercial use, the Android OS has one of the largest, wealthiest, and most innovative companies in modern-day computing currently behind it: Google. Add in the OHA, and you have more than a trillion dollars of mega-brand companies behind you, supporting your app development efforts. It certainly seems too good to be true; however, it’s a fact: if you’re an Android developer (which you are about to be, in about a dozen or so chapters), then you now have a supreme hardware and software sales and support team behind your new media content development business.

 

Finally, and most important, it’s much easier to get your Android applications published than it is with those other platforms that are similar to Android 7.1.1 (I won’t mention names here, to protect the not-so-innocent). We all know we would rather spend our time on applications development than on trying to get our Android apps approved for sale!

 

We’ve all heard those horror stories regarding major development companies waiting months, and sometimes years, for their apps to be approved for other app marketplaces. These problems are nearly non-existent on the open source Android platform. Publishing an app in the Google Play store is as easy as paying $50, uploading your Android .apk file, and specifying whether you are offering a free or a paid download. Let’s take a look at what we are going to cover during this book, and at what we are not going to be covering. Finally, we’ll look at the new Android 7.0 “Nougat” operating system features, before we finish up with this first chapter.

 

The Scope of This Book

 

This book is an introduction to the core features and attributes of Android, and to the work process for developing applications for Android. The book is intended for absolute

 

beginners; that is, people who have never created an application on the Android platform for a consumer electronic device. If you are already familiar with Android, then this book is not appropriate for you. I do not assume that readers know what Java is; or how XML works;

 

or what styles or themes are; or what a codec, alpha channel, color depth, dithering, or a blending mode algorithm is.


6 CHAPTER 1: An Introduction to Android 7.0 Nougat

 

All I know is that by the end of this book, you’re going to appear as if you are speaking a foreign language when you start talking about new media Android application development in front of friends, family, and clientele, which ultimately will get you hired, and hopefully, well paid. Be advised that it will take far more than one book to learn the “ins and outs”

 

of Android, so be sure to check out all of the other Android and Pro Android titles at http://www.apress.com.

 

What Is Covered in This Book

 

This book covers the basic and essential elements of Android application development, including but not limited to the following areas:

 

The open source software development tools required to develop for the Android 7.x platform

 

Where to get this free software development environment, as well as professional new media content creation tools that can be used in conjunction with the Android Studio 2.3 IDE

 

How to properly install and configure the necessary tools for Android 7 application development, as well as for new media content creation tools that can be used with Android Studio 2.3

 

Which third-party tools are useful to use in conjunction with the Android Studio 2.3 IDE

 

Which OSs and platforms currently support development for Android using these tools

 

The concepts and programming constructs for Java and XML, and their practical applications in creating Android applications

 

How Android Studio 2.3 goes about setting up an Android application

 

How Android OS defines Android application user interface (UI) components using the View class

 

How Android OS controls UI component layout on the display screen using the ViewGroup class

 

How Android can communicate with other Android applications using the Intent class

 

How Android apps interface with content providers, datastores, resources, networks, and the Internet

 

How Android alerts users to events that may be taking place, inside or outside of an Android app

 

How Android applications are defined for publishing using the app’s Android manifest XML file

 

How Android applications can use threads for background processing using the Service class


CHAPTER 1: An Introduction to Android 7.0 Nougat

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It is important to know that Android OS has more than 250 Java packages, and that one book cannot introduce you to everything that is available to you in the Android 7.1.1 OS development environment. This Android development environment contains functionality that allows you to do just about anything imaginable, from putting a button on the display screen; to synthesizing speech; creating virtual reality or smart watch faces; leveraging interactive television set or auto dashboard features; or accessing advanced smartphone features, such as the high-resolution camera, Bluetooth communication, NFC, GPS, gyroscope, compass, or accelerometer. If you would like to review each of these Android packages for yourself, you can find them at the following URL for the Android developer website:

 

https://developer.android.com/reference/packages.html

 

Note  A package in Java is a collection of programming utilities, or functions, that all have related (and interconnected) functionality. For example, the java.io package contains the utilities that deal with input and output (IO) to your program, such as reading the contents of a file, or saving data to a file. A later Java primer chapter describes how to organize your Java code into your own custom Android application packages.

 

 

Unlike this book, most Android books will specialize in a specific area of Android programming. For instance, my Pro Android Wearables (Apress, 2015) title focuses on SmartWatch application development, and my Pro Android Graphics (Apress, 2014) focuses on Android graphics pipeline design. We will be learning about APIs, or Application Programming Interfaces, in the chapter on Java. There is plenty of complexity in each Android API, which ultimately, from the developer’s perspective, translates into incredible creative power. What is the price of this power, you might ask? Your valuable time spent mastering each API is the only price you will pay, as Android 7.x OS is otherwise free for commercial use.

 

What Is Not Covered in This Book

 

So then what is not covered in this book? What cool powerful capabilities do you have to look forward to in the next level book on Android programming? In a nutshell, anything that’s not a core class or feature that Android apps are built upon. On the hardware side, we will not be looking at how to control the camera, access GPS data from the smartphone, or access the accelerometer, or the gyroscope, which allows the user to turn the smartphone around, or have the application react to the smartphone position. We will not be delving into advanced touchscreen concepts, such as gestures; accessing other device hardware, such as a microphone, Bluetooth, NFC, and Wi-Fi connections; or image compositing, which is covered in Pro Android Graphics (Apress, 2013).

 

On the software side, we will not be diving into creating your own Android MySQLite database structure, or real-time 3D rendering system (OpenGL ES 3.2 and Vulkan), although we will take a closer look at these areas in later chapters, so that you know how to utilize them, and how they fit into the overall Android 7.1.1 infrastructure. We will not be exploring speech synthesis and speech recognition, nor the universal language support that allows developers to create applications that display characters correctly in dozens of international languages and foreign character sets. We will not be getting into advanced programming


8 CHAPTER 1: An Introduction to Android 7.0 Nougat

 

such as game development, artificial intelligence, image compositing pipelines, blending modes, and physics simulations. We won’t get into advanced user interface design concepts and techniques, such as the topics covered in my Pro Android UI (Apress, 2014) title or my Learn Android App Development (Apress, 2013) title that I wrote previously.

 

What’s New in Android