隐藏虚拟按键

        final View parent = inflater.inflate(R.layout.gn_answer_fragment,                container, false);        ExtensionManager.getVilteAutoTestHelperExt().registerReceiverForAcceptAndRejectUpgrade(           getActivity(),getPresenter());        if (android.os.SystemProperties.get("qemu.hw.mainkeys").equals("0")                && (getActivity().checkSelfPermission(Manifest.permission.STATUS_BAR)                == PackageManager.PERMISSION_GRANTED)) {            Log.i("AnswerFragment.onCreateView", "STATUS_BAR permission granted, disabling nav bar");            int flags = View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;            // These flags will suppress the alert that the activity is in full view mode            // during an incoming call on a fresh system/factory reset of the app            flags |= STATUS_BAR_DISABLE_BACK | STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT;            parent.setSystemUiVisibility(flags);        }