学习Java进行Android开发 - 英文版

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"这是一本专注于Android高级开发的英文书籍，名为'Android.3.0.Animations'，作者是Jeff“JavaJeff”Friesen。该书旨在帮助读者掌握编写成功Android应用所需的Java技能和知识。" 本书《Learn Java for Android Development》由Java专家Jeff Friesen撰写，主要针对那些希望进入Android应用开发领域的Java初学者。书中深入浅出地介绍了Java编程语言，这是开发Android应用的基础。作者通过实例和实践指导，使读者能够快速理解并掌握Java编程的核心概念，从而为构建Android应用程序打下坚实的基础。在Android开发中，Java是主要的编程语言，因此，这本书将涵盖变量、数据类型、控制流（如if语句和循环）、类与对象、继承、接口、异常处理等Java基础知识。此外，由于标题提及了"Animations"，可以推测书中会详细讲解Android 3.0版本中的动画系统，包括视图动画、属性动画以及如何创建流畅、互动的用户界面。书中可能还会涉及Android特有的概念，如意图（Intents）、活动（Activities）、服务（Services）、广播接收器（Broadcast Receivers）以及内容提供者（Content Providers）。这些组件是Android应用架构的关键部分，理解和熟练运用它们对于开发功能丰富的应用程序至关重要。此外，考虑到Android 3.0的发布，书中的内容可能还会涵盖平板电脑优化、多线程处理、性能优化、资源管理和内存管理等方面的知识，这些都是Android高级开发中不可忽视的部分。同时，可能会介绍如何使用Android Studio进行项目设置、调试技巧以及如何发布应用到Google Play商店。书中提到的版权信息表明，所有权利归作者和出版商所有，未经许可不得复制或传播。虽然没有列出具体的ISBN号，但通常这类信息意味着这本书是正式出版的，并且可以在合法的电子和印刷形式中获得。《Learn Java for Android Development》是一本面向有志于Android高级开发的程序员的实用指南，它将帮助读者从零开始学习Java，并逐步掌握Android应用开发的各个方面，特别是Android 3.0中的动画技术。通过阅读此书，开发者不仅可以提升Java编程技能，还能深入了解Android平台的特性和最佳实践。

■ INTRODUCTION

xiv

Note: You can download this book’s source code by pointing your web browser to

www.apress.com/book/view/1430231564 and clicking the Source Code link under Book Resources.

Although most of this code is compilable with Java version 6, you will need Java version 7 to compile one

of the applications.

Chapter 1 introduces you to Java by first focusing on Java’s dual nature (language and

platform). It then briefly introduces you to Sun’s/Oracle’s Java SE, Java EE, and Java ME editions

of the Java development software, as well as Google’s Android edition. You next learn how to

download and install the Java SE Development Kit (JDK), and learn some Java basics by

developing and playing with a pair of simple Java applications. After receiving a brief

introduction to the NetBeans and Eclipse IDEs, you learn about application development in the

context of Four of a Kind, a console-based card game.

Chapter 2 starts you on an in-depth journey of the Java language by focusing on language

fundamentals (such as types, expressions, variables, and statements) in the contexts of classes

and objects. Because applications are largely based on classes, it is important to learn how to

architect classes correctly, and this chapter shows you how to do so.

Chapter 3 adds to Chapter 2’s pool of object-based knowledge by introducing you to those

language features that take you from object-based applications to object-oriented applications.

Specifically, you learn about features related to inheritance, polymorphism, and interfaces. While

exploring inheritance, you learn about Java’s ultimate superclass. Also, while exploring interfaces,

you discover the real reason for their inclusion in the Java language; interfaces are not merely a

workaround for Java’s lack of support for multiple implementation inheritance, but serve a

higher purpose.

Chapter 4 introduces you to four categories of advanced language features: nested types,

packages, static imports, and exceptions. While discussing nested types, I briefly introduce the

concept of a closure and state that closures will appear in Java version 7 (which many expect to

arrive later this year).

Note: I wrote this book several months before Java version 7’s expected arrival in the fall of 2010.

Although I have tried to present an accurate portrayal of version 7–specific language features, it is possible

that feature syntax may differ somewhat from what is presented in this book. Also, I only discuss closures

briefly because this feature was still in a state of flux while writing this book. For more information about

closures and other functional programming concepts (such as lambdas) being considered for Java version 7, I

recommend that you check out articles such as “Functional Programming Concepts in JDK 7” by Alex Collins

(

http://java.dzone.com/articles/lambdas-closures-jdk-7).

Chapter 5 continues to explore advanced language features by focusing on assertions,

annotations, generics, and enums. Although the topic of generics has brought confusion to many

developers, I believe that my discussion of this topic will clear up much of the murkiness. Among

other items, you learn how to interpret type declarations such as Enum<E extends Enum<E>>.

Chapter 6 begins a trend that focuses more on APIs than language features. This chapter first

introduces you to many of Java’s math-oriented types (such as Math, StrictMath, BigDecimal, and

BigInteger), and also introduces you to Java’s strictfp reserved word. It then looks at the

Package class, primitive wrapper classes, and the References API.

■ INTRODUCTION

Chapter 7 continues to explore Java’s basic APIs by focusing on reflection, string

management, the System class, and threading.

Chapter 8 focuses exclusively on Java’s collections framework, which provides you with a

solution for organizing objects in lists, sets, queues, and maps.

Chapter 9 continues to explore Java’s utility APIs by introducing you to the concurrency

utilities, internationalization, preferences, random number generation, and regular expressions.

Chapter 10 is all about input/output (I/O). In this chapter, you explore Java’s classic I/O

support in terms of its File class, RandomAccessFile class, various stream classes, and various

writer/reader classes. My discussion of stream I/O includes coverage of Java’s object serialization

and deserialization mechanisms.

Note: This book largely discusses APIs that are common to Java SE and Android. However, it diverges from

this practice in Chapter 9, where I use the Swing toolkit to provide a graphical user interface for one of this

chapter’s internationalization examples. (Android does not support Swing.)

After you complete this book, I recommend that you obtain a copy of Beginning Android 2 by

Mark L Murphy (Apress, 2010; ISBN: 1430226293) and start learning how to develop Android

apps. In that book, “you’ll learn how to develop applications for Android 2.x mobile devices,

using simple examples that are ready to run with your copy of the JDK.”

Note: Over the next few months, I will make available at my javajeff.mb.ca website six additional PDF-

based chapters. These chapters will introduce you to more Java APIs (such as networking and database

APIs) that I could not discuss in this book because the book has greatly exceeded its initial 400-page

estimate (and the good folks at Apress have been gracious enough to let me do so, but there are limits). I

present more information about these PDF files at the end of Chapter 10’s “Summary” section.

Thanks for purchasing my book. I hope you find it a helpful preparation for, and I wish you

lots of success in achieving, a satisfying and lucrative career as an Android app developer.

Jeff “JavaJeff” Friesen, August 2010

CHAPTER 1: Getting Started with Java

NOTE: Java has an interesting history that dates back to December 1990. At that time, James

Gosling, Patrick Naughton, and Mike Sheridan (all employees of Sun Microsystems) were given

the task of figuring out the next major trend in computing. They concluded that one trend would

involve the convergence of computing devices and intelligent consumer appliances. Thus was

born the Green project.

The fruits of Green were Star7, a handheld wireless device featuring a five-inch color LCD

screen, a SPARC processor, a sophisticated graphics capability, and a version of Unix; and Oak, a

language developed by James Gosling for writing applications to run on Star7, and which he

named after an oak tree growing outside of his office window at Sun. To avoid a conflict with

another language of the same name, Dr. Gosling changed this language’s name to Java.

Sun Microsystems subsequently evolved the Java language and platform until Oracle acquired

Sun in early 2010. Check out http://java.sun.com/ for the latest Java news from Oracle.

Java Is a Language

Java is a language in which developers express source code (program text). Java’s

syntax (rules for combining symbols into language features) is partly patterned after the

C and C++ languages to shorten the learning curve for C/C++ developers.

The following list identifies a few similarities between Java and C/C++:

 Java and C/C++ share the same single-line and multiline comment

styles. Comments let you document source code.

 Many of Java’s reserved words are identical to their C/C++

counterparts (for, if, switch, and while are examples) and C++

counterparts (catch, class, public, and try are examples).

 Java also supports character, double precision floating-point, floating-

point, integer, long integer, and short integer primitive types, and via

the same char, double, float, int, long, and short reserved words.

 Java also supports many of the same operators, including arithmetic

(+, -, *, /, and %) and conditional (?:) operators.

 Java also uses brace characters ({ and }) to delimit blocks of

statements.

The following list identifies a few differences between Java and C/C++:

 Java supports an additional comment style known as Javadoc. (I will

briefly introduce Javadoc later in this chapter.)

 Java provides reserved words not found in C/C++ (extends, strictfp,

synchronized, and transient are examples).

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学习Java进行Android开发 - 英文版

高清彩版 Packt.Android.High.Performance.Programming

The Busy Coder's Guide to Android Development 8.11

《Cocos2d-Js开发之旅-从HTML5到原生手机游戏》完整源码

06/03 10:58:31: Launching 'app' on Pixel 4 API 26. Install successfully finished in 1 s 251 ms. $ adb shell am start -n "com.example.fangmeituan/com.example.fangmeituan.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER

com.android.support:support-v4,找不到com.android.support:support-v4:22.0.0. SDK更新后

All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 26.1.0. Examples include `com.android.support:animated-vector-drawable:28.0.0` and `com.android.support:mediarouter-v7:26.1.0`

android-tools-fsutils_5.1.1.r38-1.1_amd64.deb

com.android.support:support-v4包下载

android13 所有 media 相关的 module

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