以编程方式将新项目添加到 recyclerview? [英] Add a new item to recyclerview programmatically?

问题描述

我仍在努力了解 recyclerview.我有一个数组列表，我用它来初始化回收器视图.

I'm still trying to get my head around recyclerview. I have an arraylist, that I use to initialize a recycler view with.

如何在设置适配器和布局管理器后将新项目添加到回收站视图?

How can I add new items to the recycler view post setting an adapter and layoutmanager?

private void initData() {
        mItems = new ArrayList<String>();
        for (int i = 0; i < ITEMS_COUNT; i++) {
            mItems.add("Item " + (i + 1));
        }
    }

    private void initRecyclerView() {
        mRecentRecyclerView = (RecyclerView) findViewById(R.id.recentrecyclerView);
        mRecentRecyclerView.setHasFixedSize(true);
        mRecentLayoutManager = new LinearLayoutManager(this);
        mRecentRecyclerView.setLayoutManager(mRecentLayoutManager);



        mAdapter = new RecyclerView.Adapter<CustomViewHolder>() {
            @Override
            public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
                View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.notice_snippet
                        , viewGroup, false);
                return new CustomViewHolder(view);
            }

            @Override
            public void onBindViewHolder(CustomViewHolder viewHolder, int i) {
                viewHolder.noticeSubject.setText(mItems.get(i));
            }

            @Override
            public int getItemCount() {
                return mItems.size();
            }

        };
        mRecentRecyclerView.setAdapter(mAdapter);

    private class CustomViewHolder extends RecyclerView.ViewHolder {

        private TextView noticeSubject;

        public CustomViewHolder(View itemView) {
            super(itemView);

            noticeSubject = (TextView) itemView.findViewById(R.id.notice_subject);
        }
    }

所以基本上在我 initdata() 和 initRecyclerView() 之后，我如何向 RecyclerView 添加新项目??

So basically after I initdata() and initRecyclerView(), how do i add a new item to the RecyclerView??

推荐答案

首先将你的项目添加到 mItems 然后使用:

First add your item to mItems and then use:

mAdapter.notifyItemInserted(mItems.size() - 1);

这种方法比使用更好:

mAdapter.notifyDataSetChanged();

在性能方面.

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