android finish destroy process

http://blog.csdn.net/ameyume/archive/2010/12/09/6064586.aspx

http://groups.google.com/group/android-developers/browse_thread/thread/e1418f8d068f4d7f?pli=1

http://developer.android.com/reference/java/lang/Process.html

http://developer.android.com/reference/android/preference/PreferenceActivity.html

http://developer.android.com/guide/topics/fundamentals/activities.html

http://developer.android.com/reference/android/app/Activity.html#ProcessLifecycle

http://developer.android.com/guide/topics/fundamentals/activities.html