android launchmode疑问？

今天准备弄清楚android中launchmode问题，

查阅许多文章后仍然不够清楚它的细节。

最后在http://groups.google.com上发现了Dianne Hackborn（google的人？）的解释，

对singleInstance有了进一步了解，这四种模式平常使用也能实现对应的功能，

不过有些地方还是云里雾里。

anne Hackborn在对问题的回复中提到：

You need to read through all of the documentation on launch modes, tasks,
taskAffinities, and activity stacks. The singleInstance mode imposes
constraints on the activity that you can't understand without understanding
these other things.

提到了modes, tasks, taskAffinities, and activity stacks. 看来还需要进一步精读dev guide才是问题的最终解决之道呀！