xlistview上拉刷新，下拉加载

最新推荐文章于 2018-10-25 15:55:25 发布

healer1

最新推荐文章于 2018-10-25 15:55:25 发布

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分类专栏： xlistview 文章标签： xlistview

本文链接：https://blog.youkuaiyun.com/healer1/article/details/77103164

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本文介绍了一个基于Android平台的XListView实现方案，该方案支持下拉刷新和上拉加载更多的功能。通过继承AppCompatActivity并使用AsyncTask进行后台数据加载，结合Gson进行JSON数据解析，展示了如何自定义Adapter来填充ListView中的数据项。

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package com.qianqian.xlistview;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.google.gson.Gson;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.qianqian.xlistview.bean.Data;
import com.qianqian.xlistview.view.xlist.XListView;

import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    //声明变量
    XListView xlv;
    List<Data.NewslistBean> list=new ArrayList<Data.NewslistBean>();;
    int current=1;
     MyAdapter adapter;
    boolean flag=false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找控件
        xlv= (XListView) findViewById(R.id.xlv);
        //初始化数据
        initData();
        //设置适配器
        adapter = new MyAdapter();
        //绑定
        xlv.setAdapter(adapter);
        //刷新
        xlv.setPullRefreshEnable(true);
        //加载
        xlv.setPullLoadEnable(true);
        //时间
        xlv.setRefreshTime("2017-10-18");
        //监听
        xlv.setXListViewListener(new XListView.IXListViewListener() {
            //刷新
            @Override
            public void onRefresh() {
                flag=false;
                current=1;
                initData();
                xlv.stopRefresh();
            }
            //加载
            @Override
            public void onLoadMore() {
                flag=true;
                current++;
                initData();
                xlv.stopLoadMore();

            }
        });
    }
//初始化数据
    private void initData() {
        new AsyncTask<String, String, String>() {
            @Override
            protected String doInBackground(String... parmas) {
                //解析
                getData();
                return null;
            }


            @Override
            protected void onPostExecute(String result) {
                //刷新
                adapter.notifyDataSetChanged();
                super.onPostExecute(result);
            }
        }.execute();
    }
    //解析的方法
    private void getData() {
        //路径
        String path="https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+current;
        try {
            URL url=new URL(path);
            HttpURLConnection conn=(HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            int code = conn.getResponseCode();
            if (code==200) {
                //gson解析
                Gson gson=new Gson();
                Data data = gson.fromJson(new InputStreamReader(conn.getInputStream()), Data.class);
//				list=data.getNewslist();
                if (flag) {
                    list.addAll(data.getNewslist());
                } else {
                    list=data.getNewslist();
                }
               // list.addAll(data.getNewslist());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
//适配器的方法
    class  MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            if (list!=null){
                return  list.size();
            }
            return 0;
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }
        //优化
        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            ViewHolder holder;
            if (view==null) {
                //加载布局
                view=View.inflate(MainActivity.this, R.layout.item, null);
                holder=new ViewHolder();
                //扎控件
                holder.tv_title =(TextView) view.findViewById(R.id.tv_title);
                holder.tv_desc =(TextView) view.findViewById(R.id.tv_desc);
                holder.tv_time =(TextView) view.findViewById(R.id.tv_time);
                holder.iv =(ImageView) view.findViewById(R.id.iv);
                view.setTag(holder);
            }else {
                holder=(ViewHolder) view.getTag();
            }
            //赋值
            holder.tv_title.setText(list.get(i).getTitle());
            holder.tv_desc.setText(list.get(i).getDescription());
            holder.tv_time.setText(list.get(i).getCtime());
            ImageLoader.getInstance().displayImage(list.get(i).getPicUrl(), holder.iv);

            return view;
        }
    }
static  class  ViewHolder{
TextView tv_title,tv_desc,tv_time;
    ImageView iv;
}
}

//图片package com.qianqian.xlistview.bean;

import android.app.Application;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.qianqian.xlistview.R;


public class Myapction extends Application{
    @Override
    public void onCreate() {
        //初始化一个默认图片的配置
        DisplayImageOptions options=new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.ic_launcher)
                //渐显
                .displayer(new FadeInBitmapDisplayer(3000)).cacheOnDisk(true)
                .cacheInMemory(true)
                .build();
        ImageLoaderConfiguration config=new ImageLoaderConfiguration.Builder(this)
                .threadPoolSize(4)
                .defaultDisplayImageOptions(options)
                .build();
        //初始化
        ImageLoader.getInstance().init(config);
        super.onCreate();
    }
}

//xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="80dp"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@+id/iv"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/tv_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:singleLine="true"
            android:text="标题" />

        <TextView
            android:id="@+id/tv_desc"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:lines="2"
            android:text="描述" />

        <TextView
            android:id="@+id/tv_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:singleLine="true"
            android:text="时间" />
    </LinearLayout>

    <ImageView
        android:id="@+id/iv"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentLeft="true" />

</RelativeLayout>