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By Zigurd Mednieks, G. Blake Meike, Laird Dornin, Masumi Nakamura
What does it take to construct well-engineered Android functions? discover Android's middle development blocks and APIs extensive with this authoritative consultant, and the best way to create compelling apps that paintings on an entire diversity of Android units. You'll paintings with confirmed ways to app layout and implementation--including software frameworks so you might use as a kick off point in your personal projects.
Delve into sensors, local improvement, 3D pictures, and lots of different subject matters, and become aware of easy methods to construct apps at the platform of your selection. If you're an intermediate to complex programmer, you'll how one can make nice Android apps.
* the right way to use the Android SDK with the Eclipse IDE
* practice complex Java suggestions despite your adventure with the language
* Create an Android consumer interface that's alluring and straightforward to navigate
* Use the Fragment API for pill consumer interfaces
* Make your program suitable with Honeycomb and prior versions
* comprehend Android's targeted database layout matters and the function of SQLite
* Use sensors and gestures to extend your app's enter past simply tapping and scrolling
* discover Android APIs for multimedia, place, conversation, NFC, and different functions
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starting Android four is an replace to starting Android three, initially written by means of Mark Murphy. it's your first step at the route to developing marketable apps for the burgeoning Android marketplace, Amazon's Android Appstore, and extra. Google’s Android operating-system has taken the by way of typhoon, going from its humble beginnings as a telephone working approach to its present prestige as a platform for apps that run throughout a gamut of units from telephones to capsules to netbooks to televisions, and the record is certain to develop.
shrewdpermanent builders aren't sitting idly by means of within the stands, yet are leaping into the sport of making leading edge and salable functions for this fast-growing, cellular- and consumer-device platform. If you’re no longer within the online game but, now could be your likelihood!
starting Android four is clean with info at the newest generation of the Android platform. start in the beginning through fitting the instruments and compiling a skeleton app. go through growing layouts, applying widgets, taking consumer enter, and giving again effects. quickly you’ll be developing cutting edge purposes related to multi-touch, multi-tasking, location-based function units utilizing GPS.
You’ll be drawing info stay from the web utilizing internet companies and delighting your buyers with life-enhancing apps. no longer because the workstation period first all started has there been this a lot chance for the typical developer. What are you looking ahead to? seize your replica of starting Android four and start!
<h3>What you’ll learn</h3> * increase Java-based cellular functions and video games for a variety of telephones and units.
* Create consumer interfaces utilizing WebKit and the Android widget framework.
* construct position- and map-based functions drawing on dwell feeds over the web.
* contain actions, providers, content material prone, and broadcast receivers into your functions.
* aid a number of Android models, a number of display sizes, and different device-specific features.
* construct and adventure the array of latest WebM video and different multimedia APIs for Android and extra.
Who this booklet is for
starting Android four is geared toward programmers new to Android software improvement who wish to create marketable functions for the burgeoning marketplace of cellphone, capsule, and different Android equipment clients.
desk of Contents * the massive photo
* tips on how to start
* Your First Android undertaking
* analyzing Your First venture
* a section approximately Eclipse
* bettering Your First venture
* Rewriting Your First undertaking
* utilizing XML-Based Layouts
* making use of easy Widgets
* operating with boxes
* The enter procedure Framework
* utilizing choice Widgets
* Getting Fancy with Lists
* nonetheless extra Widgets and bins
* Embedding the WebKit Browser
* utilizing Menus
* displaying Pop-up Messages
* dealing with task Lifecycle occasions
* dealing with Rotation
* facing Threads
* growing rationale Filters
* Launching actions and Sub-Activities
* operating with assets
* Defining and utilizing kinds
* dealing with a number of reveal Sizes
* Introducing the Honeycomb UI
* utilizing the motion Bar
* Fragments
* dealing with Platform adjustments
* having access to documents
* utilizing personal tastes
* coping with and gaining access to neighborhood Databases
* Leveraging Java Libraries
* speaking through the net
* companies: the idea
* easy carrier styles
* Alerting clients through Notifications
* asking for and Requiring Permissions
* gaining access to Location-Based prone
* Mapping with MapView and MapActivity
* dealing with cell Calls
* Fonts
* extra improvement instruments
* The position of other Environments
* HTML5
* PhoneGap
* different replacement Environments
* facing units
* the place can we cross from the following?
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It is a particularly good idea to use this idiom with constructors that must make explicit calls to a superconstructor. Constructors should be simple and should do no more work than is necessary to put an object into a consistent initial state. One can imagine, for instance, a design for an object that represents a database or network connection. It might create the connection, initialize it, and verify connectivity, all in the constructor. While this might seem entirely reasonable, in practice it creates code that is insufficiently modular and difficult to debug and modify.
C++, Python, and Perl) permit a capability known as multiple implementation inheritance, whereby an object can inherit implementations of methods from more than one parent class. Such inheritance hierarchies can get pretty complicated and behave in unexpected ways (such as inheriting two field variables with the same name from two different superclasses). Java’s developers chose to trade the power of multiple inheritance for simplicity. Unlike the mentioned languages, in Java a class may extend only a single superclass.
You’ve broken reflexivity! hashCode and equals should be considered a pair: if you override either, you should override both. Many library routines treat hashCode as an optimized rough guess as to whether two objects are equal or not. These libraries first compare the hash codes of the two objects. If the two codes are different, they assume there is no need to do any more expensive comparisons because the objects are definitely different. The point of hash code computation, then, is to compute something very quickly that is a good proxy for the equals method.