Android 2 Grundlagen und Programmierung by Arno Becker

By Arno Becker

Java-erfahrene Leser lernen in diesem Buch, hochwertige software program für die Android-Plattform zu entwickeln. Im ersten Teil des Buches lernt der Leser zunächst die grundlegenden Konzepte und Elemente von Android kennen. Im anschließenden Praxisteil kann er anhand eines durchgängigen Beispiels Schritt für Schritt die Entwicklung einer mobilen Anwendung nachvollziehen. Der dritte Teil bereitet Entwickler auf den professionellen und sicheren Einsatz von Android in der Praxis vor.
Die 2. Auflage wurde komplett auf die Android-Version 2 aktualisiert und um neue Themen erweitert (Live Folder, Kamera- und Video-Unterstützung, SMS senden und empfangen).

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Extra info for Android 2 Grundlagen und Programmierung

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Anwendungsschicht Auf dieser Ebene des Systems befinden sich die Android-Anwendungen. Dabei kann es sich um Eigenentwicklungen oder die von Google mitgelieferten Standardanwendungen handeln. Innerhalb der Anwendungsschicht findet die Kommunikation zwischen Mensch und Maschine sowie Interaktionen zwischen Anwendungen statt. Jede Anwendung bedient sich dabei der darunterliegenden Programmierschnittstelle. 2 17 Die Dalvik Virtual Machine Die Dalvik Virtual Machine wurde von einem Google-Mitarbeiter namens Dan Bornstein entwickelt.

Die für eine Anwendung passende Instanz dieser Klasse ist jeder Activity bekannt. 6 zeigt, wie der Titeltext einer Activity mit Hilfe der Methode getResources ausgelesen und weiterverwendet wird. ") >= 0 ) { ... } } Das Ressourcen-Objekt ist von dem Datentyp, in den die Ressource vom Ressourcencompiler übersetzt worden ist. Diesen Typ bezeichnen wir als Zieldatentyp der Ressource. B. hintergrund); Wir sind nun in der Lage, Ressourcendateien zu speichern und auf deren Inhalte zuzugreifen. Doch wie definiert man eine Ressource konkret?

Doch wie definiert man eine Ressource konkret? Was sind die Besonderheiten einzelner Ressourcen-Arten? Diese und andere Fragen wollen wir in den nächsten Abschnitten beantworten. Wir stellen die Ressourcen-Arten kurz vor und geben Beispiele für ihre Verwendung. 3 Textbausteine auslagern Text-Ressourcen Texte sind Grundbaustein einer jeden Anwendung. Sie sollten einfach zu pflegen sein und manchmal auch in mehreren Sprachen vorliegen. Das Konzept, Textbausteine vom Java-Code zu trennen, hat sich in zahlreichen JEE-Frameworks (Struts, JSF, Spring) bewährt.

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