Download Android Essentials (Firstpress) by Chris Haseman PDF

By Chris Haseman

The fashion is nice, however it was once written sooner than the discharge of android 1.0, such a lot of examples do not really paintings. Very complicated when you are now not skilled.

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DEFAULT" /> Now, if you’ve correctly added the earlier code in place, when you send a SMS message from the DDMS perspective, you should see your application come to the foreground and the “Hello World, PrankActivity” text display proudly on the screen. Rigging the Activity There is one last piece you’ll need to add before getting into the more dastardly music playback service: rigging up the activity to correctly Android Essentials 27 respond to the action sent by your SMS intent receiver.

Layout objects come in many different flavors, each of which you’ll look at really quickly and then check out with a simple example in the following sections. Caution At compile time, these XML layout files are parsed and packed by Android into a tight binary format. This saves monstrous amounts of parsing time on startup. However, it means that the XML files cannot be changed by your code during runtime. More specifically, you may be able to change these XML files during execution, but it will do absolutely nothing to the layout of your application.

This object hierarchy allows you to lay out complex user interfaces without having to go through the errorprone process of calculating view rectangles and widget overlap maps. 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. For the sake of this book, I’ll break down and discuss views as three major food groups: ƒ XML-defined widgets/views and view groups: Good for basic information display and menus ƒ Android native views: TextViews, LayoutGroups, ScrollBars, and text entry ƒ Custom views: The game programmer’s best friend Android Essentials 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.

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