Important note: Make sure that whatever app or game you want to run in fullscreen has an option to exit from the application and doesn't rely on Android's back button. Otherwise you'll need to shut down the tablet using the power button because you won't be able to exit!
Here's the link to APK Edit:
EDIT: Here's another link in case you're not registered on xda-developers (I really recommend you do sign up there and check out their community though!)
1) Download the .zip, extract APK Edit.exe and run it.
2) Immediately when you run APK Edit, an Open window will come up. Select the .apk you want to edit. The .apk should open in the program.
3) Click on the content tab. Towards the bottom there will be a heading called "Other content." Scroll down the box and right click on AndroidManifest.xml and open it with your favorite text editor.
4) Add the following line to the list of uses-permission entries:
Code: Select all
<uses-permission android:name="archos.permission.FULLSCREEN.FULL" />
That's all there is too it. I didn't need to resign the apk or anything. I just dragged it back onto my Archos 70, uninstalled Assassin's Creed and reinstalled it from the new .apk. It kept the game data and the game ran in fullscreen with no menu buttons. It was nice not having the game controls obstructed.