展开回收者视图的父项时填充子项目

Question

在我的项目中，我必须在列表视图或回收视图中使用可扩展功能。我选择了 recyclerview，因为它的性能更好。

但我必须制作可扩展版本所以我得到了非常好的库 here 它真的很好用。但是后来我遇到了一个问题，那就是

我想从 web 服务中填充子视图信息，当用户单击父项目时应调用该服务。我不知道如何使用同一个库来完成
我想制作永无止境的 RecyclerView，所以这意味着我必须使用诸如拉动之类的东西来刷新类型的东西，但这会在用户到达 RecyclerView 的末尾时发生。知道如何使用同一个库实现这两个功能吗？

请帮助我并告诉我正确的方法。至少对于第一次混淆。提前致谢

更新 1：

我在下面分享的源代码是这个库的演示代码在这个代码片段中你可以看到他在创建ParentList（组列表）的对象的同时设置了子列表（Item List）。从 web 服务中获取后我想在哪里填充子列表

public class Recipe implements ParentListItem {

private String mName;
private List<Ingredient> mIngredients;

public Recipe(String name, List<Ingredient> ingredients) {
    mName = name;
    mIngredients = ingredients;
}

public String getName() {
    return mName;
}

@Override
public List<?> getChildItemList() {
    return mIngredients; // How can I return list after getting data from the web service 
}

@Override
public boolean isInitiallyExpanded() {
    return false;
}

}

然后他设置为

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_recycler_view_sample);

    Ingredient beef = new Ingredient("beef");
    Ingredient cheese = new Ingredient("cheese");
    Ingredient salsa = new Ingredient("salsa");
    Ingredient tortilla = new Ingredient("tortilla");
    Ingredient ketchup = new Ingredient("ketchup");
    Ingredient bun = new Ingredient("bun");

    Recipe taco = new Recipe("taco", Arrays.asList(beef, cheese, salsa, tortilla));
    Recipe quesadilla = new Recipe("quesadilla", Arrays.asList(cheese, tortilla));
    Recipe burger = new Recipe("burger", Arrays.asList(beef, cheese, ketchup, bun));
    final List<Recipe> recipes = Arrays.asList(taco, quesadilla, burger);

    RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
    mAdapter = new RecipeAdapter(this, recipes);
    mAdapter.setExpandCollapseListener(new ExpandableRecyclerAdapter.ExpandCollapseListener() {
        @Override
        public void onListItemExpanded(int position) {
            Recipe expandedRecipe = recipes.get(position);

            String toastMsg = getResources().getString(R.string.expanded, expandedRecipe.getName());
            Toast.makeText(VerticalLinearRecyclerViewSampleActivity.this,
                    toastMsg,
                    Toast.LENGTH_SHORT)
                    .show();
        }

        @Override
        public void onListItemCollapsed(int position) {
            Recipe collapsedRecipe = recipes.get(position);

            String toastMsg = getResources().getString(R.string.collapsed, collapsedRecipe.getName());
            Toast.makeText(VerticalLinearRecyclerViewSampleActivity.this,
                    toastMsg,
                    Toast.LENGTH_SHORT)
                    .show();
        }
    });

    recyclerView.setAdapter(mAdapter);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));

error Log 当我尝试从 web 服务填充成分列表时发生此错误。我所做的是我将成分列表设为静态，并从 webservice 中静态设置它并从覆盖函数

中检索它

Process: com.naziraschool.nazraschoolsystem, PID: 484 java.lang.IndexOutOfBoundsException: Invalid index 4, size is 4 at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255) at java.util.ArrayList.remove(ArrayList.java:403) at com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.collapseParentListItem(ExpandableRecyclerAdapter.java:604) at com.bignerdranch.expandablerecyclerview.Adapter.ExpandableRecyclerAdapter.onParentListItemCollapsed(ExpandableRecyclerAdapter.java:274) at com.bignerdranch.expandablerecyclerview.ViewHolder.ParentViewHolder.collapseView(ParentViewHolder.java:164) at com.bignerdranch.expandablerecyclerview.ViewHolder.ParentViewHolder.onClick(ParentViewHolder.java:124)

Answer 1

阅读这个库的文档，我看到以下片段可以让你监听父扩展

MyAdapter adapter = new MyAdapter(this, recipes);

adapter.setExpandCollapseListener(new ExpandableRecyclerAdapter.ExpandCollapseListener() {
    @Override
    public void onListItemExpanded(int position) {
        Recipe expandedRecipe = recipes.get(position);
        // ...
    }

    @Override
    public void onListItemCollapsed(int position) {
        Recipe collapsedRecipe = recipes.get(position);
        // ...
    }
});

mRecyclerView.setAdapter(adapter);

在 onListItemExpanded 方法中，您应该执行网络调用并在适配器中加载数据，然后调用 notifyDataSetChanged() 刷新数据。

展开回收者视图的父项时填充子项目

Filling the Child items when expanding the parent of recycler view

android

android-recyclerview

expandablerecyclerview