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范围和中心点
repeatCount interger（loop forever use infinite(-1)）
RepeatMode：restart (1)
reverse (2)
android.view.animation
rule of thumb is to apply your transformational parameters locally
memory intensive（须要很多其它内存）：Displaying the image from memory onto the View is fairly straightforward and does not require any complex calculations, so all processing involves moving each frame’s image asset from memory over to display screen.
tends to be more processing intensive（须要很多其它计算）
Animation pagAni = AnimationUtils.loadAnimation(this, R.anim.pag_anim); （view）pag.startAnimation(pagAni);
《Pro Android Graphics》读书笔记之第四节
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原文地址：http://www.cnblogs.com/bhlsheji/p/5346118.html
