android 9 源碼 隱藏 虛擬按鈕

路徑：

frameworks\base\packages\SystemUI\src\com\android\systemui\statusbar\phone\StatusBar.java

修改：

        try {
            boolean showNav = mWindowManagerService.hasNavigationBar();
            if (DEBUG) Log.v(TAG, "hasNavigationBar=" + showNav);
		+	showNav = false;
            if (showNav) {
                createNavigationBar();
            }
        } catch (RemoteException ex) {
            // no window manager? good luck with that
        }

親測可用