android ics TV / Tablet hide the navigation bar below

Recently set-top box applications, the need to hide android 4.0.x below (navigation bar + status bar), in the upper I tried various methods are listed below:

 
getWindow () getDecorView () setSystemUiVisibility (View.STATUS_BAR_HIDDEN);.. 
getWindow () getDecorView () setSystemUiVisibility (View.SYSTEM_UI_FLAG_LOW_PROFILE);.. 
getWindow () getDecorView () setSystemUiVisibility (View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);.. 
. getWindow () getDecorView () setSystemUiVisibility (4);. 

I would framework / base / packages / SystemUI following tricks (deleted directly to the application), really do full-screen, but would not be able to use a lot of things to follow, such as wallpaper, USB, etc. should be re-wrote it myself, brother Here urge Which expert guidance twelve, anxious, etc. ......

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Reply:
This should not be difficult Bangding
Reply:
The activity can be set to full screen, there are two ways
1 In the manifest, set the activity's theme is no titlebar, full screen and the like.
2 set by code, getWindow (). SetFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
Reply:
The above method does not work, the last modified source: SystemUI, the problem is solved ...
Reply:
May I ask what the next modification was achieved in SystemUI hidden ah?
Reply:

reference to the third floor michaellancy reply:

the above method does not work, last modified Source: SystemUI, the problem is solved ...

< / fieldset>
I ask you is how to modify the source code?