ExpandableList默认显示三条数据，点击更多显示全部（带上拉下拉）_android expandablelistview子集一行显示三个数据且可以点击-优快云博客

本文链接：https://blog.youkuaiyun.com/bobo89455100/article/details/54892800

本文介绍了一个简单的Android项目，实现上下拉刷新的ListView功能。通过提供的Demo，初学者可以快速了解其实现方式，并根据需要调整界面。文章包含了项目的预览图、项目结构、主要代码等。

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因为项目需求，所以要做此功能，我的好朋友肖凯直接扔给我一个demo，代码很简单，初学者也可以看懂，demo下载改成自己需要的界面即可

一、首先展示一下预览图

这里写图片描述

二、首先展示一下项目结构（开发工具Android studio）

这里写图片描述

三、部分代码（详细请下载demo，本人所有上传资源全部0分）

mainActivity

package com.szabh.boge;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.ExpandableListView;

import com.szabh.boge.listview_pulltorefresh.PullToRefreshBase;
import com.szabh.boge.listview_pulltorefresh.PullToRefreshListView;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

public class MainActivity extends Activity  implements Handler.Callback,PullToRefreshBase.OnRefreshListener{
    private ArrayList<Company> mCompanies = new ArrayList<>();
    private ExpandableListView Ex_listview;
    private MyAdapter adapter;
    private PullToRefreshListView mPullListView;
    private Context mContext;
    private boolean isPullDown = true;// 标记上拉或下拉
    private int mQueryPage=0;//每次请求的页码
    private int mPorCount=20;//每次返回的条数
    private SimpleDateFormat mDateFormat = new SimpleDateFormat("MM-dd HH:mm");
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mContext =this;
        initData();
        initView();
    }

    private void initView() {
        Ex_listview = (ExpandableListView) findViewById(R.id.lv);


        mPullListView = (PullToRefreshListView) findViewById(R.id.mPullListView_id);
        Ex_listview = mPullListView.getRefreshableView();
        mPullListView.setOnRefreshListener(this);

        adapter = new MyAdapter(MainActivity.this,mCompanies);
        Ex_listview.setAdapter(adapter);

        for (int i = 0, l = mCompanies.size(); i < l; i++) {
            Ex_listview.expandGroup(i);
        }
        Ex_listview.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
                return true;
            }
        });
    }

    private void initData() {
        for (int i = 1; i < 10; i++) {
            Company c = new Company();
            c.name = "我的主布局数据" + i;
            ArrayList<String> employees = new ArrayList<>();
            for (int j = 1; j < i + 1; j++) {
                employees.add("子的" + j);
            }
            c.employees = employees;
            mCompanies.add(c);
        }
    }



    private void setLastUpdateTime() {
        String text = formatDateTime(System.currentTimeMillis());
        mPullListView.setLastUpdatedLabel(text);
    }

    private String formatDateTime(long time) {
        if (0 == time) {
            return "";
        }
        return mDateFormat.format(new Date(time));
    }
    @Override
    public void onPullDownToRefresh(PullToRefreshBase refreshView) {
        isPullDown=true;
        mQueryPage=0;
//      加载网络数据
    }

    @Override
    public void onPullUpToRefresh(PullToRefreshBase refreshView) {
        isPullDown=false;
        mQueryPage = mQueryPage+5 ;
//      加载网络数据
    }

    @Override
    public boolean handleMessage(Message message) {
        return false;
    }
}

MyAdapter适配器

package com.szabh.boge;

import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by XianBo.Geng on 2017/1/12.
 */
public class MyAdapter extends BaseExpandableListAdapter{

    private Context context;
    private List<Company> mdata;
    private LayoutInflater inflater;
    public MyAdapter(Activity Activity, ArrayList<Company> mCompanies) {
        context =Activity;
        mdata = mCompanies;
        inflater =LayoutInflater.from(context);
    }

    @Override
    public int getGroupCount() {
        return mdata.size();
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        int size = mdata.get(groupPosition).employees.size();
        if (size < 4) {
            return size;
        } else {
            if (mdata.get(groupPosition).isMore) {
                return size + 1;
            } else {
                return 4;
            }
        }
    }

    @Override
    public Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

//            LayoutInflater inflater = LayouInflater.from(parent.getContext());
        View v = inflater.inflate(R.layout.item_company, null);
        TextView tv = (TextView) v.findViewById(R.id.tv);
        tv.setText(mdata.get(groupPosition).name);

        TextView tvs = (TextView) v.findViewById(R.id.group_service_name);
        tvs.setText(mdata.get(groupPosition).name+"啦啦啦啦");
        return v;

    }

    @Override
    public View getChildView(final int groupPosition, int childPosition, boolean isLastChild, View convertView,
                             ViewGroup parent) {
        int size = mdata.get(groupPosition).employees.size();
        Log.i("Text","111111111111111111111111111"+size);
        if (size < 4) {
            View v = View.inflate(parent.getContext(), R.layout.item_employee, null);
            TextView tv = (TextView) v.findViewById(R.id.tv);
            tv.setText(mdata.get(groupPosition).employees.get(childPosition));


            return v;
        } else {
            if (mdata.get(groupPosition).isMore) {
                if (childPosition == mdata.get(groupPosition).employees.size()) {
                    View v = View.inflate(parent.getContext(), R.layout.item_more, null);
                    TextView tv = (TextView) v.findViewById(R.id.tv);
                    tv.setText("点击收起");
                    tv.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            mdata.get(groupPosition).isMore = false;
                            notifyDataSetChanged();
                        }
                    });
                    return tv;
                } else {
                    View v = View.inflate(parent.getContext(), R.layout.item_employee, null);
                    TextView tv = (TextView) v.findViewById(R.id.tv);
                    tv.setText(mdata.get(groupPosition).employees.get(childPosition));

                    return v;
                }
            } else {
                if (childPosition == 3) {
                    View v = View.inflate(parent.getContext(), R.layout.item_more, null);
                    TextView tv = (TextView) v.findViewById(R.id.tv);
                    tv.setText("点击查看更多");
                    tv.setOnClickListener(new View.OnClickListener() {

                        @Override
                        public void onClick(View v) {
                            mdata.get(groupPosition).isMore = true;
                            notifyDataSetChanged();
                        }
                    });
                    return v;
                } else {
                    View v = View.inflate(parent.getContext(), R.layout.item_employee, null);
                    TextView tv = (TextView) v.findViewById(R.id.tv);
                    tv.setText(mdata.get(groupPosition).employees.get(childPosition));

                    return v;
                }
            }
        }
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}

实体类

package com.szabh.boge;

import java.util.ArrayList;

public class Company {
    public String name;
    public ArrayList<String> employees;
    public boolean isMore;
}