Posted by : Rhyf Ahmad Saturday, May 23, 2015

The Android menagerie of widgets and the tools for assembling them are convenient and powerful, and cover a broad variety of needs. What happens, though, when none of the existing widgets offer what you need?

Maybe your application needs to represent playing cards, phases of the moon, or the power diverted to the main thrusters of a rocket ship. In that case, you’ll have to know how to roll your own. This chapter is an overview of graphics and animation on Android. It’s directed at programmers with some background in graphics, and goes into quite a bit of depth about ways to twist and turn the display. You will definitely need to supplement the chapter with Android documentation, particularly because the framework is still changing. A major change in implementation, around the time of Honeycomb, for instance, takes better advantage of hardware acceleration. It also substantially affects the ways in which an application can optimize its drawing. Still, the techniques here will help you dazzle your users.


Rolling Your Own Widgets
  1. Layout
  2. Canvas Drawing
  3. Drawables
  4. Bitmaps

  1. Shadows, Gradients, Filters, and Hardware Acceleration
  2. Animation
  3. OpenGL Graphics

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