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By Florian Hawlitzek
Java is a flexible, modular and simple to benefit, and features a huge variety of commonplace programming libraries and interfaces. because of Java's platform independence, it makes it a well-liked selection between either pastime programmers and pros. actual to the Addison-Wesley "Nitty Gritty" moto, the ebook concentrates at the "most vital concerns "and bargains guidance of their day-by-day use. With a robust specialize in perform, the e-book includes quite a few examples on topics akin to CORBA, company JavaBeans, distant approach Invocation, servlets and multithreading. extra designated reasons of syntax and conventional libraries are lined within the moment a part of this ebook. within the ultimate half, there are advice and tips so that you can effective track your purposes.
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starting Android four is an replace to starting Android three, initially written via Mark Murphy. it's your first step at the route to developing marketable apps for the burgeoning Android industry, Amazon's Android Appstore, and extra. Google’s Android operating-system has taken the via hurricane, 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 drugs to netbooks to televisions, and the checklist is certain to develop.
clever builders usually are not 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 now not within the online game but, now could be your likelihood!
starting Android four is clean with info at the most up-to-date new release of the Android platform. start first and foremost by means of fitting the instruments and compiling a skeleton app. go through growing layouts, utilizing widgets, taking consumer enter, and giving again effects. quickly you’ll be developing cutting edge purposes concerning multi-touch, multi-tasking, location-based function units utilizing GPS.
You’ll be drawing facts dwell from the net utilizing internet providers and delighting your clients with life-enhancing apps. no longer because the computing device period first all started has there been this a lot chance for the typical developer. What are you awaiting? seize your reproduction of starting Android four and start!
<h3>What you’ll learn</h3> * strengthen Java-based cellular functions and video games for quite a lot of telephones and units.
* Create consumer interfaces utilizing WebKit and the Android widget framework.
* construct situation- and map-based functions drawing on stay feeds over the net.
* contain actions, providers, content material services, and broadcast receivers into your purposes.
* help a number of Android types, 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 ebook 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 telephone, capsule, and different Android machine clients.
desk of Contents * the massive photo
* easy methods to start
* Your First Android undertaking
* analyzing Your First undertaking
* a piece approximately Eclipse
* improving Your First undertaking
* Rewriting Your First venture
* utilizing XML-Based Layouts
* applying simple Widgets
* operating with bins
* The enter procedure Framework
* utilizing choice Widgets
* Getting Fancy with Lists
* nonetheless extra Widgets and boxes
* Embedding the WebKit Browser
* employing Menus
* exhibiting Pop-up Messages
* dealing with job Lifecycle occasions
* dealing with Rotation
* facing Threads
* growing motive Filters
* Launching actions and Sub-Activities
* operating with assets
* Defining and utilizing types
* dealing with a number of monitor Sizes
* Introducing the Honeycomb UI
* utilizing the motion Bar
* Fragments
* dealing with Platform alterations
* gaining access to documents
* utilizing personal tastes
* dealing with and having access to neighborhood Databases
* Leveraging Java Libraries
* speaking through the web
* providers: the speculation
* uncomplicated carrier styles
* Alerting clients through Notifications
* soliciting for and Requiring Permissions
* gaining access to Location-Based prone
* Mapping with MapView and MapActivity
* dealing with cellphone Calls
* Fonts
* extra improvement instruments
* The position of other Environments
* HTML5
* PhoneGap
* different substitute Environments
* facing units
* the place can we pass from right here?
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Jede Instanz wird mit einem Doppelpunkt und durch Unterstreichung gekennzeichnet. Für die einzelnen Instanzvariablen wird der Wert angegeben. Objekte werden im Speicher abgelegt, die automatische Speicherverwaltung von Java kümmert sich darum, dass genügend Speicherplatz angefordert wird und dieser bei Löschung des Objektes wieder freigegeben wird. Es nützt aber nichts, dass das Objekt irgendwo im Speicher existiert, man muss darauf auch wieder zugreifen können. Dazu verwendet man Referenzen, die auf ein bestimmtes Objekt verweisen.
42 Klassen und Objekte Sandini Bib void ueberweisen(Konto zielkonto, double betrag) ... void ueberweisen(int zielkontoNummer, double betrag) ... 2 Vererbung Neben der Kapselung, also der Zusammenfassung von Daten und Funktionen in Klassen, ist die Vererbung das wichtigste objektorientierte Prinzip. Objekte können Eigenschaften von anderen Objekten bzw. deren Klassen »erben«, d. h. sie übernehmen deren Eigenschaften, sofern sie nicht in der eigenen Definition anders definiert sind. Damit muss man identischen Code nur einmal programmieren, was auch aus Wartbarkeitsgründen vorteilhaft ist.
Hier muss an die Erfahrung und das Fingerspitzengefühl des Programmierers appelliert werden. Nicht selten geschieht es, gerade in den Anfängen der Java-Programmierung, dass die Begeisterung über ein elegantes Vererbungskonzept den Blick für einfache und durchschaubare Klassenhierarchien trübt. Vor jeder Definition einer Klassen- und Interface-Hierarchie sollten Sie sich daher genau überlegen, ob zur Lösung dieses Problems wirklich eine Klassenhierarchie nötig ist oder ob dieses Problem auch mit einfacheren Konstrukten zu lösen ist.