By Chris Haseman
Android necessities is a no-frills, no-nonsense, code-centric run throughout the guts of software improvement on Google's cellular OS. This booklet makes use of the advance of a pattern program to paintings via issues, targeting giving builders the basic instruments and examples required to make achievable advertisement purposes paintings. protecting everything of the Android catalog in lower than one hundred fifty pages is just most unlikely. as an alternative, this booklet specializes in simply 4 major subject matters: the appliance lifestyles cycle and OS integration, person interface, location-based providers, and networking.
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It also gives developers the tools to crack open and modify these values on the fly during runtime, as you’ll do now by exploring how to interact with Android’s built-in widgets. Waking Up the Widgets I’ve already demonstrated how to use Android’s TextView, Button, and EditText widgets. But how useful is a text-entry field if you can’t ingest what your users have entered? That’s a rhetorical question; don’t answer it—I won’t be able to hear you (I hope). info 55 with no purpose or result is not useful at all.
If, on the other hand, that sort of thing is your bag, Android will stay out of the way and let you render in the style of Java ME’s hand-drawn game canvas. In this chapter, you’ll start with basic XML-based screen layouts and move toward the more complex custom canvas drawing. info 41 You’ll start with a sample login screen, move into manipulating and laying out widgets and views in code, and finally render an interactive animation with a custom view. Easy and Fast, the XML Layout Getting started with XML layouts might seem simple at first, but it’s going to get complicated really quickly.
Essentially, it’s meant to be an object that runs as a separated process from the user interface. It’s perfect for cases when a developer wants functionality (be it network or multimedia related) to be able to run independently. Examples include audio playback, background web transactions, and evil prank applications. Although services allow multiple applications to bind (to open a communications channel), with them you’ll be using it as a simple background process. Again, services have a wealth of uses beyond the simple one you’re putting them to here.