Building Android applications in C in Java

Creating QR-Code in Java Building Android applications in C

Building Android applications in C
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This chapter covers
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Building an application in C Using dynamic linking Building a DayTime Server in C Building a Daytime Client in Java
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Up to this point, this book has presented a cross section of development topics in an effort to unlock the potential of the Android platform for the purpose of delivering useful, and perhaps even fun, mobile applications. In chapter 12 you built a comprehensive application, building on what we introduced in the prior chapters. As you embark on this chapter, you re temporarily leaving behind the comforts of working strictly in the Android SDK, Java, and Eclipse. We ll instead take a close look at the underlying Linux underpinnings of the Android platform and more specifically, you ll learn how to build an application in C, without the SDK. The Android SDK is comprehensive and capable, but there may be times when your application requires something more. This chapter explores the steps required to build applications that run in the Linux foundation layer of Android. To accomplish this, we re going to use the C programming language. In this chapter, we use
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Building Android apps without the SDK
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the term Android/Linux to refer to the Linux underpinnings of the Android platform. We also use the term Android/Java to refer to a Java application built using the Android SDK and Eclipse. C language mastery on this platform is powerful because much of the C language development process involves porting existing, open source Linux code to the mobile platforms. This technique has the potential benefit of speeding up development for adding future functionality to Android by leveraging existing code bases. 19 examines the Android Native Developer s kit (NDK). Using the NDK, programmers can leverage existing C code and map those routines to applications written in Java. This chapter doesn t use the NDK, but rather looks at building standalone C applications capable of running on the Android platform. We demonstrate the specific steps of building an Android/Linux application in C. We begin with a description of the environment and the required tool chain. After an obligatory Hello World caliber application, you ll construct a more sophisticated application that implements a DayTime Server. Ultimately any application built for Android/Linux needs to bring value to the user in some form. In an effort to meet this objective, it s desirable that Android/Java be able to interact in a meaningful manner with our Android/Linux application. To that end, you ll build a traditional Android application using Java in Eclipse to interact with the Android/Linux server application. Let s get started with an examination of the requirements for building your first C application for Android.
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13.1 Building Android apps without the SDK
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Applications for Android/Linux are markedly different from applications constructed with the Android SDK. Applications built with Eclipse and the context-sensitive Java syntax tools make for a comfortable learning environment. In line with the spirit of Linux development, from here on out all development takes place with commandline tools and nothing more sophisticated than a text editor. Though the Eclipse environment could certainly be leveraged for non-Java development, the focus of this chapter is on core C language1 coding for Android/Linux. The first place to start is with the cross-compiling tool chain required to build Android/Linux applications.
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13.1.1 The C compiler and linker tools
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Building applications for Android/Linux requires the use of a cross-compiler tool chain from CodeSourcery. The specific version required is the Sourcery G++ Lite Edition for ARM, found at https://support.codesourcery.com/GNUToolchain/release1479. Once installed, the Sourcery G++ tool chain contributes a number of useful tools to assist you in creating applications targeting Linux on ARM, which is the architecture of the Android platform. The ARM platform is a 32-bit reduced instruction set computer
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For details on the C programming language start here: http://www.cprogramming.com/.
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