| dragon thx. 
 ok . i add native file with code
 
 
import android.view.View;
class decore {
     Void setdecore() {
	    View decorView = getWindow().getDecorView();
		int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN;
		decorView.setSystemUiVisibility(uiOptions);
	}
 }
and get this error :
 
 
-compile:
    [javac] Compiling 3 source files to C:\MyProjects\MyGameProjects\myFontTest\myFontTest.build\android\bin\classes
    [javac] C:\MyProjects\MyGameProjects\myFontTest\myFontTest.build\android\src\com\monkeycoder\monkeygame\MonkeyGame.java:2757: error: cannot find symbol
    [javac] 	    View decorView = getWindow().getDecorView();
    [javac] 	                     ^
    [javac]   symbol:   method getWindow()
    [javac]   location: class decore
    [javac] C:\MyProjects\MyGameProjects\myFontTest\myFontTest.build\android\src\com\monkeycoder\monkeygame\MonkeyGame.java:2758: error: cannot find symbol
    [javac] 		int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN;
    [javac] 		                                                          ^
    [javac]   symbol:   variable SYSTEM_UI_FLAG_FULLSCREEN
    [javac]   location: class View
    [javac] Note: C:\MyProjects\MyGameProjects\myFontTest\myFontTest.build\android\src\com\monkeycoder\monkeygame\MonkeyGame.java uses unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.
    [javac] 2 errors
 any suggestions are welcome
 
 
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