在 NestedScrollView 中使用 RecyclerView 时性能不佳 [英] Bad performance when use RecyclerView inside NestedScrollView

问题描述

我正在开发一个搜索联系人功能，在该屏幕中，NestedScrolView 中有一个 RecyclerView(fillViewport = true).屏幕设计:(这个设计被客户接受了，我不能改变它)

将当前设备的所有联系人加载到一个ArrayList后，从该数组中过滤搜索结果.
有几种情况会使应用非常滞后:
1. 当用户输入一个没有结果的输入，然后用户清除搜索，我必须再次显示所有结果.NestedScrollView 必须为 RecyclerView 的所有项目(例如:300 个项目)呈现 UI.
2. 当结果的数量有很多变化时(例如，从 1 项到 300 项).NestedScrollView 必须为 RecyclerView 的许多项呈现 UI

I'm developing a search contact feature, in that screen, there is a RecyclerView inside NestedScrolView (fillViewport = true). Screen design: (This design is accepted by customer, I can't change it)

After loading all contacts of current device into an ArrayList, the search results are filtered from this array.
There is several cases that make the app very laggy:
1. When user type an input that have no result, then user clear search, I have to show all results again. The NestedScrollView has to render UI for all items of RecyclerView (for example: 300 items).
2. When the quantity of results has many changes (for example, from 1 to 300 items). The NestedScrollView has to render UI for a lot of items of RecyclerView

我知道这个设计破坏了 RecyclerView 的回收技术，但我无法改变它.
我试过的:

I know this design breaks recycling technique of RecyclerView, but I can't change it.
What I tried:

recyclerView.setNestedScrollingEnabled(false);

在 AndroidManifest 中:

In AndroidManifest:

android:windowSoftInputMode="adjustNothing"

适配器:

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

    private List<MobileContact> contacts;
    private Context context;

    public RecyclerContactAdapter() {
        contacts = new ArrayList<>();
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        this.context = parent.getContext();
        View view = LayoutInflater.from(context)
                .inflate(R.layout.item_recycler_contact, parent, false);

        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        //set data for view
    }

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

    protected class ViewHolder extends RecyclerView.ViewHolder {
        private TextView tvAlphabetHeader;
        private CircleImageView civAvatar;
        private TextView tvContactName;
        private TextView tvStatus;
        private CheckBox cbInvited;
        private RelativeLayout rlAlphabetHeader;
        private RelativeLayout rlContainer;

        protected ViewHolder(View itemView) {
            super(itemView);
            tvAlphabetHeader = itemView.findViewById(R.id.item_recycler_contact_tv_alphabet_header);
            civAvatar = itemView.findViewById(R.id.item_recycler_contact_civ_avatar);
            tvContactName = itemView.findViewById(R.id.item_recycler_contact_tv_name);
            tvStatus = itemView.findViewById(R.id.item_recycler_contact_tv_status);
            cbInvited = itemView.findViewById(R.id.item_recycler_contact_cb_contact);
            rlAlphabetHeader =  itemView.findViewById(R.id.item_recycler_contact_rl_alphabet);
            rlContainer = itemView.findViewById(R.id.item_recycler_contact_rl_contact);
        }
    }

    public void addAll(List<MobileContact> mobileContacts) {
        this.contacts.clear();
        this.contacts.addAll(mobileContacts);
        notifyDataSetChanged();
    }

    public void add(MobileContact mobileContact) {
        this.contacts.add(mobileContact);
    }

    public List<MobileContact> getContacts() {
        return this.contacts;
    }

}

推荐答案

您未正确使用 RecyclerView.而不是将您的 RecyclerView 放在 NestedScrollView 中，而是将您的标题"和搜索框"作为不同的视图类型放在 RecyclerView 中.

You are using RecyclerView incorrectly. Instead of putting your RecyclerView inside NestedScrollView put your "Header" and "Search box" inside RecyclerView as different view types.

这个答案就是一个很好的例子.

This answer is a good example.

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