Android 在任何新更新时通知导航抽屉的列表项

我希望在导航抽屉的一个列表项上有一个徽章，并在我提出请求时更新它。我已经完成了xml部分以及抽屉的制作。但问题是，我想更改父片段中的子片段的值，而父片段与导航抽屉一起位于主容器活动中

NavMenulistatadapter

 @Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.nav_drawer_list_adapter, null);
        holder.navImags = (ImageView) convertView.findViewById(R.id.nav_list_img);
        holder.navText = (TextView) convertView.findViewById(R.id.nav_list_txt);
        holder.numOfOffers = (TextView) convertView.findViewById(R.id.badge);
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.navImags.setImageResource(items.get(position).getIcon());
    holder.navText.setText(items.get(position).getTitle());

    if (items.get(position).getCounterVisibility()) {
        holder.numOfOffers.setVisibility(TextView.VISIBLE);
        holder.numOfOffers.setText(items.get(position).getCount());
    } else {

        holder.numOfOffers.setVisibility(TextView.INVISIBLE);
    }
    return convertView;
}

导航抽屉碎片

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(
            R.layout.fragment_navigation_drawer, container, false);

    navMenuList = (ListView) view.findViewById(R.id.nav_menu_list);
    navSubMenuList = (ListView) view.findViewById(R.id.nav_sub_menu_list);
    navMenuItems = new ArrayList<>();
    navMenuItems.add(new NavDrawerItem("Offer In Range", R.drawable.ic_location_normal, true, "0"));
    navMenuItems.add(new NavDrawerItem("All Offers", R.drawable.ic_all_offers_normal));
    navMenuItems.add(new NavDrawerItem("Favorites", R.drawable.ic_favorite_normal));
    navMenuItems.add(new NavDrawerItem("Registeration", R.drawable.ic_register_normal));
    navMenuAdapter = new NavMenuAdapter(getActivity(), navMenuItems);

    navSubMenuItems = new ArrayList<>();
    navSubMenuItems.add(new NavDrawerItem("Settings", R.drawable.ic_action_settings));
    navSubMenuItems.add(new NavDrawerItem("About", R.drawable.ic_action_info));
    navSubMenuItems.add(new NavDrawerItem("Help", R.drawable.ic_action_help));
    navSubMenuAdapter = new NavMenuAdapter(getActivity(), navSubMenuItems);

    return view;
}

  @Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_map_container, container, false);
    tabs = (SlidingTabLayout) view.findViewById(R.id.tabs);
    viewPager = (ViewPager) view.findViewById(R.id.viewpager);

    allFragments.add(new AppMapFragment());
    allFragments.add(new ListFragment());
    return view;
}

我想从中更新徽章的AppMapFragment

以及主要的容器活动

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toolbar = (Toolbar) findViewById(R.id.app_bar_main);
    setSupportActionBar(toolbar);
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mFragmentContainerView = findViewById(R.id.navigation_drawer);
    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            supportInvalidateOptionsMenu();
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            supportInvalidateOptionsMenu();

        }
    };
    drawerLayout.setDrawerListener(drawerToggle);
    drawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
            GravityCompat.START);

    getSupportFragmentManager()
            .beginTransaction()
            .replace(R.id.container,
                    new MapContainerFragment()).commit();
}

我希望我粘贴了所有的代码，这将有助于你们理解我的问题，如果不是请让我知道。

---

谢谢。

您可以在更新时再次调用自定义适配器。@SurenderKumar但是如何？我是否应该创建我的导航抽屉片段的新实例，然后调用其函数来更新adpater？如果您尝试了此链接，如果没有，请尝试，希望它能帮助您。是的，我尝试过，但我通过在导航抽屉片段中创建一个静态方法并从我的地图片段调用该静态方法，制定了自己的解决方案。。现在它的工作很完美。。谢谢

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    toolbar = (Toolbar) findViewById(R.id.app_bar_main);
    setSupportActionBar(toolbar);
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    mFragmentContainerView = findViewById(R.id.navigation_drawer);
    drawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close) {

        @Override
        public void onDrawerClosed(View drawerView) {
            super.onDrawerClosed(drawerView);
            supportInvalidateOptionsMenu();
        }

        @Override
        public void onDrawerOpened(View drawerView) {
            super.onDrawerOpened(drawerView);
            supportInvalidateOptionsMenu();

        }
    };
    drawerLayout.setDrawerListener(drawerToggle);
    drawerLayout.setDrawerShadow(R.drawable.drawer_shadow,
            GravityCompat.START);

    getSupportFragmentManager()
            .beginTransaction()
            .replace(R.id.container,
                    new MapContainerFragment()).commit();
}