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button-press, the main program loop has to execute fast enough so that it doesn t miss the button-press while it s busy doing something else in the loop For simple programs, this isn t usually a problem, but as the length and complexity of a program increases, it quickly becomes an impossible task The solution is to implement an interrupt routine in the program An interrupt is a highpriority routine that takes precedence over anything else the program may be doing at the time In effect, an interrupt tells the processor stop what you re doing, take care of this, and then go back and pick up where you left off In order to implement an interrupt, we need to make two additions to our program First, at the beginning of the program we need to issue a setint command that specifies the input conditions that we want to trigger the interrupt Second, we need to include a subroutine (which must be named interrupt) that contains the code to be executed

In this chapter we explored incorporating C language code via the NDK in the context of an image-processing application. The NDK is the means by which the JNI is accessible for Android developers. The JNI permits the Android developer to leverage the C environment for two primary purposes: to take advantage of C s speed capabilities for conducting time-critical operations to leverage existing code libraries written in C. The chapter s sample application demonstrated a classic image-processing algorithm called edge detection with a fully functional application that demonstrated not only the C language elements required by the NDK toolset, but also the necessary Java code changes required to employ the custom JNI library. The chapter wrapped up by adding the NDK build process into the overall Android project build process. This makes building an NDK application as streamlined as possible by setting up the NDK as an external tool to take advantage of Eclipse s auto-build feature.

The plug-in works by first splitting the text passed to it into separate paragraphs using the PHP explode() function with an argument of \n, which is the newline character What this function does is return an array of substrings based on splitting the original string each time a \n is encountered The function returns these paragraphs in the array $paragraphs A foreach loop is then entered passing $paragraphs as the input, and then each iteration of the loop places one paragraph at a time into the string variable $paragraph

Meeting development environment requirements Obtaining and installing Eclipse Obtaining the Android SDK Using the SDK and AVD Manager Configuring the Android Development Tools for Eclipse

If you are familiar with the concept of an interrupt in a program, you will know where this is going If not, let me briefly explain As you know, all programs tend to proceed in an orderly fashion, either sequentially executing the program statements in the order they are written, or by jumping or branching as specified in the program If we want a program to be able to respond to a

a convention I use throughout this book the plural form of a name being for an array, and the singular form of the same name used for an element extracted from that array

This appendix walks through the installation of Eclipse, the Android SDK, and the ADT plug-in for Eclipse. This appendix is meant to be a reference resource to assist in setting up the environment for Android application development. The topic of using the development tools is covered in chapter 2.

To develop Android applications, your computing environment must satisfy the minimum requirements. Android development is a quick-paced topic, with changes coming about very rapidly, so it s a good idea to stay in tune with the latest developments from the Android development team at Google. You ll find the latest information regarding supported platforms and requirements for Android Development Tools (ADT) at http://developer.android.com/sdk/requirements.html.

Next a check is made to see whether paragraphs must be indented If so, $indent will have a value greater than zero and so the str_repeat() function is used to add $indent number of non-blank spaces to the string $wrapped, which contains the wrapped text to be returned Now it s time to extract all the words in the current paragraph by using the explode() function again, but this time splitting the text up at each space The resulting list of words is placed in the array $words Then, before proceeding into processing the words, the variable $len, which monitors the length of the current line, is set to whatever value $indent has, so that the length of the first line is correctly initialized Another foreach loop is now used to iterate through the words, assigning each element in the array $words in turn to the string variable $word Then, the first action taken in the loop is to make a note of the length of the word in the variable $wlen

5

Compatible development environments for the sample applications in this book include: