[android-developers] TYPE_SYSTEM_ALERT for Activities

I'm trying to throw an intent to an activity that's triggered by some
event, and I'd like for the activity to halt execution of everything
else while it's on top. As such, I'm setting the activity as
TYPE_SYSTEM_ALERT in the activity's onCreate() method:

super.onCreate(savedInstanceState);
Window w = this.getWindow();
w.setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
setContentView(R.layout.alert);

I noticed in the documentation that some window types/flags need to be
set before setContentView, but I couldn't find a list of which. How do
I know if my activity has indeed been set as a system window? All the
examples I've seen online deal with Dialogs, not Activities.

Thanks.

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