停靠

Adapter

package adapter;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;

import com.bwei.week03exe22190112.R;

import java.util.List;

import bean.NewsBean;


public class StickyExampleAdapter extends RecyclerView.Adapter {
    //第一个吸顶
    private static final int FIRST_STICKY_VIEW = 1;
    //别的吸顶
    public static final int HAS_STICKY_VIEW = 2;
    //正常View
    public static final int NONE_STICKY_VIEW = 3;
    private final LayoutInflater mInflate;
    private final List datas;

    public StickyExampleAdapter(Context context, List datas) {
        mInflate = LayoutInflater.from(context);
        this.datas = datas;
    }

    @Override
    public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        View inflate = mInflate.inflate(R.layout.item_ui, parent, false);
        return new RecyclerViewHolder(inflate);
    }

    @Override
    public void onBindViewHolder(RecyclerViewHolder holder, int position) {
        NewsBean stickyBean = datas.get(position);
        holder.tvName.setText(stickyBean.name);
        holder.tvGender.setText(stickyBean.autor);

        if (position == 0) {
            holder.tvStickyHeader.setVisibility(View.VISIBLE);
            holder.tvStickyHeader.setText(stickyBean.sticky);
            holder.itemView.setTag(FIRST_STICKY_VIEW);
        } else {
            if (!TextUtils.equals(stickyBean.sticky, datas.get(position - 1).sticky)) {
                holder.tvStickyHeader.setVisibility(View.VISIBLE);
                holder.tvStickyHeader.setText(stickyBean.sticky);
                holder.itemView.setTag(HAS_STICKY_VIEW);
            } else {
                holder.tvStickyHeader.setVisibility(View.GONE);
                holder.itemView.setTag(NONE_STICKY_VIEW);
            }
        }
        //通过此处设置ContentDescription，作为内容描述，可以通过getContentDescription取出，功效跟setTag差不多。
        holder.itemView.setContentDescription(stickyBean.sticky);
    }

    @Override
    public int getItemCount() {
        return datas == null ? 0 : datas.size();
    }

    public class RecyclerViewHolder extends RecyclerView.ViewHolder {
        TextView tvStickyHeader;
        RelativeLayout rlContentWrapper;
        TextView tvName;
        TextView tvGender;

        RecyclerViewHolder(View itemView) {
            super(itemView);
            tvStickyHeader = (TextView) itemView.findViewById(R.id.tv_sticky_header_view);
            rlContentWrapper = (RelativeLayout) itemView.findViewById(R.id.rl_content_wrapper);
            tvName = (TextView) itemView.findViewById(R.id.name);
            tvGender = (TextView) itemView.findViewById(R.id.auto);
        }
    }
}

MainActivity

package com.bwei.week03exe22190112;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import adapter.StickyExampleAdapter;
import bean.News;
import bean.NewsBean;
import contactss.Contacts;
import presenter.MainPresenter;
import view.IView;

public class MainActivity extends AppCompatActivity implements IView {

    private TextView tvStickyHeaderView;
    private RecyclerView recyclerView;
    private MainPresenter presenter = new MainPresenter(this);


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

        Map map = new HashMap<>();
        map.put("uid", "71");
        presenter.getData(Contacts.data_url, map, News.class);
        initView();
        initListener();

    }

    /**
     * 初始化View
     */
    private void initView() {
        recyclerView = (RecyclerView) findViewById(R.id.recycle);
        tvStickyHeaderView = (TextView) findViewById(R.id.tv_sticky_header_view);

    }

    /**
     * 初始化Listener
     */
    private void initListener() {
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                View stickview = recyclerView.findChildViewUnder(0, 0);
                if (stickview != null && stickview.getContentDescription() != null) {
                    if (!TextUtils.equals(tvStickyHeaderView.getText(), stickview.getContentDescription())) {
                        tvStickyHeaderView.setText(stickview.getContentDescription());
                    }
                }
                View transInfoView = recyclerView.findChildViewUnder(
                        0, tvStickyHeaderView.getHeight() + 1);
                if (transInfoView.getTag() != null) {

                    int transViewStatus = (int) transInfoView.getTag();
                    int top = transInfoView.getTop();

                    if (transViewStatus == StickyExampleAdapter.HAS_STICKY_VIEW) {
                        if (top > 0) {
                            int dealtY = top - tvStickyHeaderView.getMeasuredHeight();
                            tvStickyHeaderView.setTranslationY(dealtY);
                        } else {
                            tvStickyHeaderView.setTranslationY(0);
                        }
                    } else if (transViewStatus == StickyExampleAdapter.NONE_STICKY_VIEW) {
                        tvStickyHeaderView.setTranslationY(0);
                    }
                }
            }
        });
    }

    public void getData(List newsData) {
        List stickyExampleModels = new ArrayList<>();
        for (int i = 0; i < newsData.size(); i++) {
            for (int j = 0; j  newsData = news.getData();
        Log.d("dataBean", "onSuccess: " + newsData.get(0).getSpus().get(0).toString());
        getData(newsData);
    }

    @Override
    public void onFail(String fail) {

    }
}

主布局

子条目

Bean

public class StickyBean {

    public String name;
    public String autor;
    public String sticky;

    public StickyBean(String sticky, String name, String autor) {
        this.sticky = sticky;
        this.name = name;
        this.autor = autor;
    }
}

 androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
        implementation 'com.android.support:recyclerview-v7:28.0.0'