android - 如何为 RecyclerView 添加 FooterView

Question

您好，我是 Android Material 设计的新手，在我的应用程序中，我正在使用 RecyclerView，我需要为此 RecyclerView 添加 footerView，我在下面编写了用于添加 footerView 的代码

但是根据我的代码，它在 Header 上添加了为什么会发生这种情况，有人可以帮助我如何将其添加为 footerView

我的代码:-

public class PersonalInformationRecyclerLanguagesAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int TYPE_FOOTER = 0;
    private static final int TYPE_ITEM = 1;
    RecyclerViewFooter recyclerViewFooter;
    private List<LanguagesBean> languagesBeanList;
    private Context context;

    public PersonalInformationRecyclerLanguagesAdapter(Context context, RecyclerViewFooter recyclerViewFooter, List<LanguagesBean> languagesBeanList) {

        this.context = context;
        this.recyclerViewFooter = recyclerViewFooter;
        this.languagesBeanList = languagesBeanList;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        if (viewType == TYPE_FOOTER) {

            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.lagnguages_recyclerview_footer_layout, parent, false);
            return new VHFooter(v);

        } else if (viewType == TYPE_ITEM) {

            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_languages_list_items, parent, false);
            return new VHItem(v);
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

        if (holder instanceof VHFooter) {

            VHFooter VHfooter = (VHFooter) holder;
            VHfooter.addMoreButton.setText(recyclerViewFooter.getAddMore());
            VHfooter.nextButton.setText(recyclerViewFooter.getNext());

        } else if (holder instanceof VHItem) {

            LanguagesBean currentItem = getItem(position - 1);
            VHItem VHitem = (VHItem) holder;
            VHitem.languageName.setText(currentItem.getName());
        }
    }

    private LanguagesBean getItem(int position) {

        return languagesBeanList.get(position);
    }

    @Override
    public int getItemCount() {

        return languagesBeanList.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {

        if (isPositionFooter(position))
            return TYPE_FOOTER;
        return TYPE_ITEM;
    }

    private boolean isPositionFooter(int position) {

        return position == 0;
    }

    class VHFooter extends RecyclerView.ViewHolder {

        private Button addMoreButton, nextButton;

        public VHFooter(View itemView) {

            super(itemView);
            addMoreButton = (Button) itemView.findViewById(R.id.addMore_button);
            nextButton = (Button) itemView.findViewById(R.id.next_button);
        }
    }

    class VHItem extends RecyclerView.ViewHolder {

        private TextView languageName;

        public VHItem(View view) {
            super(view);
            languageName = (TextView) view.findViewById(R.id.language_textview);
        }
    }
}

Activity :-

 private void intializingView(View view) {
            //Implement Recycler View
            recyclerView = (RecyclerView) view.findViewById(R.id.languages_recyclerView);
            recyclerView.setHasFixedSize(true);

            LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
            recyclerView.setLayoutManager(layoutManager);

            languagesBeanArrayList = new ArrayList<>();
            setRecyclerViewData();
            personalInformationRecyclerLanguagesAdapter = new PersonalInformationRecyclerLanguagesAdapter(getActivity(), getFooter(), languagesBeanArrayList);

            //RecyclerView.ItemDecoration itemDecoration = new RecyclerViewDividerItemDecoration(getActivity());
            //recyclerView.addItemDecoration(itemDecoration);

            recyclerView.setAdapter(personalInformationRecyclerLanguagesAdapter);

        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
    }

    /**
     * setRecyclerViewData
     */
    private void setRecyclerViewData() {

        for (int i = 0; i < 5; i++) {
            languagesBeanArrayList.add(new LanguagesBean("English", 1));
        }
    }

Answer 1

编辑:

方法一:

只是改变

private boolean isPositionFooter(int position) {

    return position == 0;
}

到

private boolean isPositionFooter(int position) {

    return position == languagesBeanList.size() + 1;
}

方法二:

您可以使用此 GitHub 库以最简单的方式将页眉或页脚添加到您的 RecyclerView。

https://github.com/lopspower/HFRecyclerView

您需要在您的项目中添加 HFRecyclerView 库，或者您也可以从 Gradle 中获取它:

compile 'com.mikhaellopez:hfrecyclerview:1.0.0'

这个库是基于在 Is there an addHeaderView equivalent for RecyclerView? @海斯特

所以我相信这是最好的方法。如果仍然不清楚，请按照该库中提供的示例进行操作。

如果有帮助，请标记。