方法一：方法參考自http://blog.csdn.net/tian_di_yi_jian/article/details/62425096，方法如下：

/**
 * 隱藏虛擬按鍵，並且全屏
*/
public static void hideBottomUIMenu(Activity activity) {
    //隱藏虛擬按鍵，並且全屏
if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
View v = activity.getWindow().getDecorView();
v.setSystemUiVisibility(View.GONE
 
);
} else if (Build.VERSION.SDK_INT >= 19) {
        //for new api versions.
View decorView = activity.getWindow().getDecorView();
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
 
}
}

方法二：通過反射找到setSystemUiVisibility方法，設定隱藏虛擬選單

    private static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION =
            // 1 | 2 | 4 | 0x200 | 0x400 | 0x00000100;
0x00000100
| 0x00000200
| 0x00000400
| 0x00000002 // hide nav bar
| 0x00000004 // hide status bar
| 0x00001000;
    private void hidSysNavigation() {
        if (Build.VERSION.SDK_INT > 10) {
            try 
 
{
                View v = getWindow().getDecorView();
Method m = View.class.getMethod("setSystemUiVisibility", int.class);
m.invoke(v, new Object[]{SYSTEM_UI_FLAG_HIDE_NAVIGATION});
//v.setSystemUiVisibility(SYSTEM_UI_FLAG_HIDE_NAVIGATION);
} catch (Throwable e) {
                e.printStackTrace();
}
        }
    }


    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
//        setContentView(R.layout.activity_full_screen);
requestWindowFeature(Window.FEATURE_NO_TITLE);
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
hidSysNavigation();
initView();
}