Remove focus from the current activity

How would i remove the focus from an activity which has just 开发者_开发问答being installed/started,

so the user's focus will remine on the previouse one? (while the new activity remine in the stack and will work in the background)

the prob is that when i start this new background activity, until i wont press back or home, the ui is stuck. and i would like to fix that some how

thanks,

ray.

Call finish(), and your activity will be destroyed and the previous activity on the activity stack will be brought to the foreground.