Easy way to hide system bar on Android ICS

Question

I will give my ICS tablets for users to complete a survey so I would like the user to work with my app only. They should not be able to switch to the home screen, press back

Answer 1

I want to add some information to the existing replies hoping it will be useful for someone.

To get a real full screen working on my low cost China tablets I need to edit a file located in

system/build.prop

replace the text

ro.property.tabletUI=true

with

#ro.property.tabletUI=true

(I comment the line). After that, I can get a full screen using

android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen"

for each activity in the minfest.xml

This solution Is good only if you sell tablets with your application and needs root privileges to edit the system/build.prop. So it's not a solution for all, so please do not downvote this little contribute.

EDIT: I noticed that my tablets have hardware buttons (Home, menù and back) on the frames. So Android lets me to hide the system bar. I tryed with other tablets that haven't hardware buttons without success.