参考：http://developer.android.com/guide/components/processes-and-threads.html。
安卓的进程是无法创建的，只能在配置文件中的属性去设置，参考：
“The manifest entry for each type of component element—<activity>, <service>, <receiver>,
and <provider>—supports
an android:process attribute
that can specify a process in which that component should run. You can set this attribute so that each component runs in its own process or so that some components share a process while others do not. You can also set android:process so
that components of different applications run in the same process—provided that the applications share the same Linux user ID and are signed with the same certificates.
The <application> element also
supports an android:process attribute, to set a default value that applies to all components.”
线程是可以创建的，使用Thread类，来完成一些异步的工作，然后通知给主线程。