By Mark Murphy
The Android improvement platform, created via Google and the Open Handset Alliance, is a platform in its truest experience, encompassing thousands of periods past the conventional Java sessions and open resource elements that send with the SDK.
With Beginning Android 2, you’ll how to boost purposes for Android 2.x cellular units, utilizing basic examples which are able to run together with your replica of the SDK. writer, Android columnist, author, developer, and neighborhood recommend Mark L. Murphy will convey you what you must be aware of to start programming Android purposes, together with easy methods to craft GUIs, use GPS, and entry net services.
<h3>What you’ll learn</h3> * realize Android and the way to exploit it to construct Java-based cellular purposes for quite a lot of telephones and different devices.
* Create person interfaces utilizing either the Android widget framework and the integrated WebKit-powered net browser components.
* make the most of the particular services of the Android engine, together with position monitoring, maps, and web access.
* Use and create Android functions incorporating actions, prone, content material services, and broadcast receivers.
* help Android 1.5, 1.6, and 2.0 units, together with facing a number of Android OS models, a number of reveal sizes, and different device-specific characteristics.
<h3>Who is that this publication for?</h3>
This publication is aimed toward humans new to cellular improvement, even perhaps to Java improvement itself.
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Additional resources for Beginning Android 2
With that in mind, it’s time to break out the XML and learn how to lay out Android activities that way. What Is an XML-Based Layout? As the name suggests, an XML-based layout is a specification of widgets’ relationships to each other—and to their containers (which are covered in Chapter 6)—encoded in XML format. Specifically, Android considers XML-based layouts to be resources, and as such, layout files are stored in the res/layout directory inside your Android project. Each XML file contains a tree of elements specifying a layout of widgets and containers that make up one View hierarchy.
To help navigate the tree of widgets and containers that make up an activity’s overall view, you can use the following: getParent(): Finds the parent widget or container. findViewById(): Finds a child widget with a certain ID. , what you provided to the activity via setContentView()). Colors There are two types of color attributes in Android widgets. Some, like android:background, take a single color (or a graphic image to serve as the background). Others, like android:textColor on TextView (and subclasses), can take a ColorStateList, including via the Java accessor (in this case, setTextColor()).
Emulators and Targets Let’s take a moment to discuss the notion of targets in Android, since they can be a bit confusing. Targets are important for your long-term application development, particularly when you use the Android emulator for testing your applications. Virtually There To use the emulator, you will need to create one or more AVDs. These virtual devices are designed to mimic real Android devices like the T-Mobile G1 or the HTC Magic. You tell the emulator which AVD to use, and the emulator will pretend it is the device described by that AVD.
Beginning Android 2 by Mark Murphy