By Zigurd Mednieks, G. Blake Meike, Laird Dornin, Masumi Nakamura

Get completely in control on Android programming, and find out how to create up to date person reviews for either handsets and capsules. With this book's greatly revised moment version, you'll specialize in Android instruments and programming necessities, together with most sensible practices for utilizing Android four APIs. If you're skilled with Java or Objective-C, you'll achieve the data worthy for construction well-engineered applications.

Programming Android is equipped into 4 parts:

• half One is helping programmers with a few Java or iOS event get off to a quick begin with the Android SDK and Android programming basics.

• half delves into the Android framework, targeting person interface and pics type hierarchies, concurrency, and databases. It's a superior origin for figuring out of ways an important components of an Android program work.

• half 3 positive factors code skeletons and styles for accelerating the advance of apps that use internet facts and Android four person interface conventions and APIs.

• half 4 promises useful assurance of Android's multimedia, seek, situation, sensor, and account APIs, plus the local improvement package, allowing builders so as to add complicated capabilities.

This up-to-date variation of Programming Android specializes in the information and developer priorities which are crucial for profitable Android improvement initiatives.

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Extra info for Programming Android: Java Programming for the New Generation of Mobile Devices (2nd Edition)

Sample text

The Java runtime will call the finalize method only if it is overridden in a subclass. If a class explicitly defines finalize, though, it is called for an object of the class just before that object is garbagecollected. Not only does Java not guarantee when this might happen, it actually can’t guarantee that it will happen at all. In addition, a call to finalize can resurrect an object! This is tricky: objects are garbage-collected when there are no live references to them. An implementation of finalize, however, could easily create a new live reference, for instance, by adding the object being finalized to some kind of list!

It just wouldn’t be very helpful. Objects, Inheritance, and Polymorphism Java supports polymorphism, one of the key concepts in object-oriented programming. A language is said to be polymorphic if objects of a single type can have different behavior. This happens when subtypes of a given class can be assigned to a variable of the base class type. An example will make this much clearer. Subtypes in Java are declared through use of the extends keyword. "); } } public class Ragtop extends Car { // override the parent's definition.

The object is a Ragtop: if you call its drive method, it will tell you about its top and its radio. On the other hand, because it is also a Car, it can be used anywhere that one would use a Car. This subtype replacement capability is a key example of the power of polymorphism and how it works with type safety. Even at compile time, it is clear whether an object is compatible with its use or not. Type safety enables the compiler to find errors, early, that might be much more difficult to find were they permitted to occur at runtime.

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