Android列表加载更多数据，并实现点赞

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
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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()");
}
}

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;

}
}