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《Pro Android Graphics》读书笔记之第三节

2024-07-04 20:38:59   224人阅读

Android Frame Animation: XML, Concepts and Optimization

Frame Animation Concepts: Cels, Framerate, and Resolution

动画的发展

  cel-base animation

raster animation

bitmap

commonly called bitmap animation

not currently support Animated GIF

Optimizing Frame Animation: Color Depth and Frame Rate

three primary ways to optimize

reduce the resolution 

reduce the color depth

and reduce the framerate

格式：PNG32,Png8

If you don’t need to composite your animation over other graphics, you can also consider using the lossy JPEG format to get a far smaller per-frame data foot print by throwing away some of the image data and resulting quality.

应该考虑硬件条件， 处理器及内存


Creating Frame Animation in Android Using XML Markup

Frame animation uses the drawable resource folder 

animation (covered in Chapter 4) uses the /res/anim folder

AnimationDrawable

Android <animation-list> Tag: The Parent Frame Container

Android‘s <item> Tag: Specifying Your Animation Frames

Creating a Frame Animation for our GraphicsDesign App

Instantiating the Frame Animation Definition Using Java

AnimationDrawable drawable = (AnimationDrawable) imageView.getDrawable();

drawable.start();


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