XListView多条目加载

最新推荐文章于 2018-05-18 14:46:31 发布

原创最新推荐文章于 2018-05-18 14:46:31 发布 · 302 阅读

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CC 4.0 BY-SA版权

本文介绍了一个基于Android平台的自定义XListView组件的实现方式，包括如何通过异步任务加载数据、处理下拉刷新及上拉加载更多功能，并展示了具体的代码实现细节。

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/**

* 导 xlistview 的代码

*导依赖(架包)

**/

<com.bwie.xlistviewlibrary.View.XListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/dxlv"/>

//主页面

import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import com.bwie.xlistviewlibrary.View.XListView;
import com.google.gson.Gson;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements XListView.IXListViewListener {
    private String url = "http://api.expoon.com/AppNews/getNewsList/type/1/p/";
    private int p = 1;
    private XListView dxlv;
    private List<User.DataBean> dlist = new ArrayList<User.DataBean>();
    private DtmAdapter dtmAdapter;

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

        dxlv = findViewById(R.id.dxlv);
        dxlv.setPullLoadEnable(true);
        dxlv.setPullRefreshEnable(true);
        dxlv.setXListViewListener(this);
        dtmAdapter = new DtmAdapter(MainActivity.this,dlist);
        dxlv.setAdapter(dtmAdapter);
        initdx(url+p);
        stopdx();
        //点击跳转到百度(WebView)
        dxlv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);
            }
        });
    }

    private void initdx(String s) {
        new DtmAsyTast().execute(s);
    }


    @Override
    public void onRefresh() {
        dlist.clear();
        initdx(url+p);
        stopdx();
    }

    @Override
    public void onLoadMore() {
        p++;
        initdx(url+p);
        stopdx();
    }

    private class DtmAsyTast extends AsyncTask<String,Void,String> {
        @Override
        protected String doInBackground(String... strings) {
            Util util = new Util();
            String getjson = util.getjson(url);
            return getjson;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            User user = gson.fromJson(s, User.class);
            List<User.DataBean> data = user.getData();
            dlist.addAll(data);
            dtmAdapter.notifyDataSetChanged();
        }
    }
    private void stopdx() {
        dxlv.stopRefresh();
        dxlv.stopLoadMore();
        dxlv.setRefreshTime("不久前");
    }
}

//适配器

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.nostra13.universalimageloader.core.ImageLoader;
import java.util.List;
class DtmAdapter extends BaseAdapter{
    private Context context;
    private List<User.DataBean> dlist;
    private final int tt = 0;
    private final int ss =1;
    public DtmAdapter(Context context, List<User.DataBean> dlist) {
        this.context = context;
        this.dlist = dlist;
    }

    @Override
    public int getCount() {
        return dlist.size();
    }

    @Override
    public Object getItem(int i) {
        return dlist.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public int getItemViewType(int position) {
        return position%getViewTypeCount();
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        int ivt = getItemViewType(i);
        ViewHolder holder = new ViewHolder();
        if (view == null){
            switch (ivt){
                case tt:
                    view = View.inflate(context,R.layout.item,null);
                    holder.img = view.findViewById(R.id.img);
                    holder.text1 = view.findViewById(R.id.text1);
                    break;
                case ss:
                    view = View.inflate(context,R.layout.item2,null);
                    holder.text2 = view.findViewById(R.id.text2);
                    break;
            }
            view.setTag(holder);
        }else {
            holder = (ViewHolder) view.getTag();
            switch (ivt){
                case tt:
                    holder.text1.setText(dlist.get(i).getNews_title());
                    ImageLoader.getInstance().displayImage(dlist.get(i).getPic_url(),holder.img);
                    break;
                case ss:
                    holder.text2.setText(dlist.get(i).getNews_summary());
                    break;
            }
        }
        return view;
    }

    class ViewHolder{
        private ImageView img;
        private TextView text1,text2;
    }
}
/**
*图片加载
*<application
*    android:name=".Mapp"
**/
import android.app.Application;
import android.os.Environment;
import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.HashCodeFileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.LruMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import java.io.File;
public class Mapp extends Application {
    File cacheFile = new File(Environment.getExternalStorageDirectory() + "/" + "image");

    @Override
    public void onCreate() {
        super.onCreate();
        //初始化组件,链式开发思想,整个框架的参数初始化配置
        //imageLoader的全局配置
        ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this)
                .memoryCacheExtraOptions(480, 800) // default = device screen dimensions 内存缓存文件的最大长宽
                .diskCacheExtraOptions(480, 800, null)  // 本地缓存的详细信息(缓存的最大长宽)，最好不要设置这个
                .tasksProcessingOrder(QueueProcessingType.FIFO) // default
                .denyCacheImageMultipleSizesInMemory()
                .memoryCache(new LruMemoryCache(2 * 1024 * 1024)) //可以通过自己的内存缓存实现
                .memoryCacheSize(2 * 1024 * 1024)  // 内存缓存的最大值
                .memoryCacheSizePercentage(13) // default
                .diskCacheSize(50 * 1024 * 1024) // 50 Mb sd卡(本地)缓存的最大值
                .diskCacheFileCount(100)  // 可以缓存的文件数量
                .diskCache(new UnlimitedDiskCache(cacheFile))//自定义缓存目录
                // default为使用HASHCODE对UIL进行加密命名， 还可以用MD5(new Md5FileNameGenerator())加密
                .diskCacheFileNameGenerator(new HashCodeFileNameGenerator())
                .defaultDisplayImageOptions(DisplayImageOptions.createSimple()) // default
                .writeDebugLogs() // 打印debug log
                .build();
        ImageLoader.getInstance().init(configuration);
    }
}
//数据网络连接
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
class Util {
    public String getjson(String url){
        URL url1 = null;
        HttpURLConnection connection = null;
        String str = "";
        try {
            url1 = new URL(url);
            connection = (HttpURLConnection) url1.openConnection();
            connection.setConnectTimeout(8000);
            connection.setReadTimeout(8000);
            int code = connection.getResponseCode();
            if (code == 200){
                InputStream inputStream = connection.getInputStream();
                byte[] b  =new byte[1024];
                int len = 0;
                while ((len = inputStream.read(b))!=-1){
                    str+=new String(b,0,len);
                }
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
    }
}
//跳转其他网页(例:百度)---布局
<WebView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/web"/>
//网页连接页面
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        WebView web = findViewById(R.id.web);
        web.loadUrl("https://www.baidu.com/");
    }
}