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).
Read or Download Android: Grundlagen und Programmierung PDF
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Additional info for Android: Grundlagen und Programmierung
Gesucht ist also ein Weg, diese Attribute innerhalb einer Anwendung einheitlich zu deﬁnieren und zuzuweisen. ) genutzt werden. Eine Formatvorlage wird einer View über ihr Attribut style zugewiesen. Dadurch erhält die View alle Attributwerte, die durch die Formatvorlage vorgegeben werden. B. Textgröße, Schriftart etc. anwendungsübergreifend deﬁnieren. 8). xml deﬁniert. 9). Die Schriftgröße wird hier in der Maßeinheit sp angegeben.
Da das Zertiﬁkat beim Hersteller der Software liegt und nicht öffentlich ist, kann man keine Anwendung mit »gestohlener« sharedUserId zum Ausspähen von privaten Daten erstellen. Für Anwendungen, die aus der Entwicklungsumgebung heraus getestet werden, gilt dies nicht. Hier wird sowieso für alle Anwendungen das gemeinsame Standardzertiﬁkat verwendet. Sicherheit dank Zertiﬁkat 7 Teil II Android in der Praxis s ch ieses Bu d e g a fl u Die 2. A 2« d i o r d n »A Mai 2010 t Ende erschein 30 In Teil II dieses Buches werden wir uns mit den Möglichkeiten und Grenzen von Android in der Praxis auseinandersetzen.
Signieren bedeutet hier, dass der Anwendung mit Hilfe des Zertiﬁkats eine »digitale Unterschrift« hinzugefügt wird. Diese Unterschrift kann nur mit dem Zertiﬁkat erzeugt werden und ist eindeutig. Dadurch lässt sich später der Ersteller der Anwendung identiﬁzieren. Das mitgelieferte Standardzertiﬁkat ist jedoch nicht eindeutig, weshalb es nur zum Entwickeln und Testen von Anwendungen verwendet werden sollte. B. über das Eclipse-Plug-in, auf dem angeschlossenen Android-Endgerät installiert werden.