Activity that does not obstruct clicks

I am starting an activity that is themed as Theme.Dialog.

I was wondering if it is possible to display the activity and still be able to click everything behind it. I know this is possible in android 开发者_运维知识库but I don't know how to do it.

An example of that is the volume pop up that shows up when you try to increase or decrease the volume settings on android 2.0. If you try to click on it all clicks are registered on whatever activity is running behind it.

Any help will be greatly appreciated.

I know this is possible in android but i don't know how to do it.

It is not possible.

An example of that is the volume pop up that shows up when you try to increase or decrease the volume settings on android 2.0. If you try to click on it all clicks are registered on whatever activity is running behind it.

That is a Toast, not an Activity.