Android列表加载更多数据，并实现点赞

版权声明：个人原创文章，欢迎点评，有错希望指出来，新手，谢谢大家--。-- https://blog.csdn.net/u013009808/article/details/53179153

http://blog.csdn.net/u013009808/article/details/53166103
上一篇地址
对我上一篇文章进行了修改
可以点击加载更多条数据
并且实现点击功能
主要修改代码：

MainActivity

package com.gz.test_listview;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;

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

public class MainActivity extends Activity implements AbsListView.OnScrollListener,View.OnClickListener{
    private int visibleLastIndex = 0;   //最后的可视项索引
    private int visibleItemCount;       // 当前窗口可见项总数
    private Button load_more;
    private View footView;
    MainActivityAdapter adapter;

    private ListView listview;
    //测试数据
    private String[] title = {"商用","家用","测试","多联","空气能","商用","家用","测试","多联","空气能"};
    private String[] praise = {"3","1","0","0","0","3","1","0","0","0"};
    private String[] step = {"0","0","0","1","1","0","0","0","1","0"};

    //将数据传回adapter中
    private List<Map<String,Object>> map = new ArrayList<Map<String, Object>>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //加载更多控件
        footView = getLayoutInflater().inflate(R.layout.footview,null);
        load_more = (Button) footView.findViewById(R.id.load_more);
        //初始化Adapter
        initAdapter();
        listview.addFooterView(footView);
        //加载更多的点击事件
        load_more.setOnClickListener(this);
        listview.setOnScrollListener(this);
        listview.setAdapter(adapter);

        listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent intent = new Intent(MainActivity.this,DetailActivity.class);
                startActivity(intent);
            }
        });
    }

    //初始化Adapter，并为初始化的十条数据赋值
    private void initAdapter() {
//        Log.e("gz/initAdapter","进入initAdapter()方法");
        listview = (ListView) findViewById(R.id.listview);

        for(int i=0;i<10;i++){
            Map<String,Object> item = new HashMap<String,Object>();
            item.put("title",title[i]);
            item.put("praise",praise[i]);
            item.put("step",step[i]);
            map.add(item);
        }
        adapter = new MainActivityAdapter(this,map);
    }

    //加载更多数据每次增加十条数据
    private void loadData() {
//        Log.e("gz/loadData","进入loadData()方法");
        int count = adapter.getCount();
        for(int i=count;i<count+10;i++){
            Map<String,Object> item = new HashMap<String,Object>();
            item.put("title",title[i-count]);
            item.put("praise",praise[i-count]);
            item.put("step",step[i-count]);
            adapter.addItem(item);
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void onClick(View v) {
            load_more.setText("加载中");
            Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    loadData();
                    adapter.notifyDataSetChanged();
                    listview.setSelection(visibleLastIndex);
                    load_more.setText("加载更多");
                }
            },2000);
    }

    //滑动事件
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        int itemsLastIndex = adapter.getCount() - 1;    //数据集最后一项的索引
        int lastIndex = itemsLastIndex + 1;             //加上底部的loadMoreView项
        if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE && visibleLastIndex == lastIndex) {
            //如果是自动加载,可以在这里放置异步加载数据的代码
//            Log.e("gz/onScrollStateChanged", "loading...");
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        this.visibleItemCount = visibleItemCount;
        visibleLastIndex = firstVisibleItem + visibleItemCount - 1;
//        Log.e("gz/onScroll","进入onScroll()");
    }
}

MainAdapter

package com.gz.test_listview;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

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

/**
 * Created by 390778 on 2016/11/9.
 */
public class MainActivityAdapter extends BaseAdapter{
    private ViewHolder holder;
    private Context context;
    private List<Bean> praise_step_num = new ArrayList<Bean>();

    private LayoutInflater inflater;
    List<Map<String,Object>> listItems;
    /*
    根据position，保存点击的是哪一行数据，默认为false，点击后改为true
    */
    private Map<Integer, Boolean> isExist = new HashMap<Integer, Boolean>();

    public MainActivityAdapter(Context context,List<Map<String,Object>> listItems){
        this.context = context;
        this.listItems = listItems;
        inflater = LayoutInflater.from(context);
        Log.i("listItem",listItems.toString());
        init();
    }

    private void init() {
        /*
        为相应的数据赋值，所有的数据存储在listItems中
        position一一对应每一行数据
         */
        for (int i = 0;i<listItems.size();i++){
            isExist.put(i,false);
            Bean b = new Bean();
            Integer praise = Integer.parseInt(listItems.get(i).get("praise").toString());
            b.setPraise(praise);
            Integer step = Integer.parseInt(listItems.get(i).get("step").toString());
            b.setStep(step);
            praise_step_num.add(i,b);
            Log.i("praise_step",praise_step_num.get(i).getPraise()+"");
        }

    }

    @Override
    public int getCount() {
//        Log.e("gz/getCount","进入getCount()方法");
        return listItems.size() ;
    }

    @Override
    public Object getItem(int position) {
//        Log.e("gz/getItem","进入getItem()方法");

        return position;
    }

    @Override
    public long getItemId(int position) {
//        Log.e("gz/getItemId","进入getItemId()方法");

        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
//        Log.e("gz/getView","进入getView()方法");
        //获取赞、踩得值
        final Bean bean = praise_step_num.get(position);

        if(convertView == null){
            holder = new ViewHolder();
            convertView = inflater.inflate(R.layout.item_praise,null);
            holder.img_praise = (ImageView) convertView.findViewById(R.id.tv_praises_img);
            holder.img_step = (ImageView) convertView.findViewById(R.id.tv_step_img);
            holder.praise = (TextView) convertView.findViewById(R.id.tv_praises);
            holder.step = (TextView) convertView.findViewById(R.id.tv_step);
            holder.title = (TextView) convertView.findViewById(R.id.tv_name);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }

        holder.praise.setText(bean.getPraise()+"");
        holder.step.setText(bean.getStep()+"");
        holder.title.setText(listItems.get(position).get("title")+"");
         /**
              每次会复用convertView,
            convertView没有被赋值，就会使用之后赋值的数据，
             比如：点击了第一行数据赞的按钮，相应的第一行点赞图片变为红色
             当向下滑动页面时，下方的也会有一项数据发生变化，复用
            在这里为每次重用赋值
             */
        if(bean.getPraise()!=0){
            holder.img_praise.setImageResource(R.drawable.good);
        }else{
            holder.img_praise.setImageResource(R.drawable.good_no);
        }
        if(bean.getStep()!=0){
            holder.img_step.setImageResource(R.drawable.bad);
        }else{
            holder.img_step.setImageResource(R.drawable.bad_no);
        }
        holder.img_praise.setOnClickListener(new imgClick(position,bean));

        return convertView;
    }

    class imgClick implements View.OnClickListener {
        private int position;
        private Bean bean;

        public imgClick(int position,Bean bean){
            this.position = position;
            this.bean = bean;
        }
        @Override
        public void onClick(final View v) {
            Log.i("position",position+"");
            if(bean.getPraise()==0){
                if(isExist.get(position) == false){
                    final Handler handler = new Handler() {
                        @Override
                        public void handleMessage(Message msg) {
                            super.handleMessage(msg);
                            switch (msg.what){
                                case 1:
                                    ImageView btn = (ImageView) v;
                                    if(v.getId() == btn.getId()) {
                                        isExist.put(position, true);
                                        bean.setPraise(bean.getPraise()+1);
                                        btn.setImageResource(R.drawable.good);
                                        AnimationTools.scale(btn);
                                        Log.i("isExist",isExist.toString()+"");
                                        notifyDataSetChanged();
                                        break;
                                    }
                                case 2:
                                    Toast.makeText(context, "失败", Toast.LENGTH_LONG).show();
                                    break;
                            }
                        }
                    };
                    new Thread(){
                        @Override
                        public void run() {
                            Message msg = new Message();
                            msg.what=1;
                            handler.sendMessage(msg);
                        }
                    }.start();
                }
            }else{
                Toast.makeText(context, "已经点击过", Toast.LENGTH_LONG).show();
            }
        }
    }

    //增加listview项
    public void addItem(Map<String,Object> item){
        listItems.add(item);
        for (int i = listItems.size()-10;i<listItems.size();i++){
            isExist.put(i,false);
            Bean b = new Bean();
            Integer praise = Integer.parseInt(listItems.get(i).get("praise").toString());
            b.setPraise(praise);
            Integer step = Integer.parseInt(listItems.get(i).get("step").toString());
            b.setStep(step);
            praise_step_num.add(i,b);
        }
    }


    private static class ViewHolder{
        public ImageView img_praise;
        private ImageView img_step;
        public TextView praise;
        private TextView step;
        private TextView title;


    }

    class Bean{
        public int getPraise() {
            return praise;
        }

        public void setPraise(int praise) {
            this.praise = praise;
        }

        public int getStep() {
            return step;
        }

        public void setStep(int step) {
            this.step = step;
        }

        private int praise;
        private int step;

    }
}

代码下载地址：
http://download.csdn.net/detail/u013009808/9683937
欢迎下载