java - 从导航 View (抽屉)动态检索对象 android/java

Question

我再次陷入编码困境，从无所不知的 StackOverflow 社区寻求知识......我的问题很简单。我已经用对象填充了导航 View 抽屉。这些对象的 toString() 方法已被覆盖，以在列表中显示每个对象自己的名称。单击抽屉列表中的每个对象都会显示一条警报消息，其中应显示(“您单击了”+ myDrawerObject.getName())问题出在 onNavigationItemSelected 监听器中。此方法返回一个 MenuItem 项目，它是一个 View 。我无法理解为什么我不能像对待它应该包含的对象一样对待这个 View 。非常感谢您的帮助，并提前致谢!

我知道 item 参数返回已单击的菜单项，但如果菜单项是一个对象，为什么我不能调用这些对象的方法？我尝试获取项目返回值并调用其 getName() 方法，但无济于事。 item.getName(); (我知道该项目是一个 View ，因此它没有“getName()”方法

我尝试将项目值转换回对象，但无济于事 MyObject myObject = (MyObject)项目;//Item 仍然是一个 View ，并且 View 似乎无法转换为对象

我什至尝试将所有创建的 MyObject 类型的对象放入静态 arrayList 中，然后尝试匹配 id 也无济于事。//在onNavigationItemSelected监听器中 int id = item.getItemId()

//somewhere else in the code
 for (anotherMyObject : listOfEveryMyObjectEverMade){
 anotherMyObject.get(id)
 }
/*returns the id of the item in the listview. as i understand a specific id 
is assigned to every item in the list. so if an object has never been in that 
particular list, it wont have that same id
*/

我必须添加抽屉的内容(字符串列表)是动态创建的，因此菜单或 menItems 没有 xml 文件!

Answer 1

我遇到了非常相似的情况，并且将我封锁了好几天!

我几乎 90% 确信一定有出路......

但我个人没有找到它，所以我采取了解决办法:

private void setMenus() {
    int temp = 0;
  //Mine was inside of a fragment, hints the getActivity() call
    NavigationView navView22 = getActivity().findViewById(R.id.navigation_view);
    MenuItem oneItem = navView22.getMenu().findItem(0);
        if (oneItem == null){
        Menu m = navView22.getMenu();
        SubMenu sm0 = m.addSubMenu(
                getResources().getString(R.string.clickToSelectRookies));
        sm0.add(0,
                temp, temp, getResources().getString(R.string.signAllString));
            tempRooks.add(round1.get(0));
  /*I had to create the entire menu dynamically, so I did so by creating 
  subMenus in my menus in numerical order
  I then created an arraylist to hold all my objects in that same order
  though in retrospect I should have just used a HashMap!!
  finally in the onClick I was able to listen for which subMenu item was clicked
   and since the menu's and my arraylist of objects corresponded I then pulled 
  the correct object from my arraylist. I realize this is a little hacky, but 
  hopefully if you do not find the answer you can do this temporarily.
  If you do find a better solution please post so we all can learn. Thank YOU!!

*/ 温度++；

        SubMenu sm1 = m.addSubMenu(
                getResources().getString(R.string.firstRoundPicks));
        for (int x = 0; x < round1.size(); x++) {
            sm1.add(0, temp, temp, round1.get(x).toString());
                tempRooks.add(round1.get(x));
            temp++;
        }