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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For instance, a barrier object B makes sure that every process invokes an operation on B before any of them returns from its operation on B. , a barrier) may often be replaced by special return values that mean “wait and retry later”. A barrier, for example, may provide an operation that returns true if this operation has already been invoked by every process, or false, otherwise; such semantics does not inherently require processes executing the barrier implementation to block waiting for each other.

38 4. , transactions that did not commit or abort yet. Because a live transaction can always be later aborted, and its updates discarded, one might naively assume that the remedy to a transaction that accesses an inconsistent state is to abort it. However, a transaction that accesses an inconsistent state can cause various problems, even if it is later aborted. To illustrate this, consider two t-variables, x and y. A programmer may assume that y is always equal to x 2 , and x ≥ 2. Clearly, the programmer will then take care that every transaction, when executed as a whole, preserves the assumed invariants.

A set of registers is sometimes called a read-write shared memory. 1. 6 (Test-and-set) A test-and-set base object is similar in functionality to a compareand-swap object. , can be either true or false, with the initial value being false. It exports the following operations: • test-and-set, which (a) changes the state to true and returns false, if the current state of the object is false, or (b) returns true, otherwise; and • reset, which sets the state to false (and returns ok). test-and-set → false .

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