电影API数据加载与解析-优快云博客

本文介绍了一个使用Android平台从远程API加载电影热榜数据的应用案例。通过AsyncTask实现异步数据请求，利用Gson库解析JSON响应，并使用XListView进行数据展示。文章详细展示了如何配置ImageLoader进行图片缓存，以及自定义适配器处理数据列表。

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主页

在这里插入代码片package com.example.dell.myapplicationday1207;

import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import me.maxwin.view.XListView;

public class MainActivity extends AppCompatActivity {

    private XListView lists;
    private NewsAdapter adapter;

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

        //寻找资源
        lists = findViewById(R.id.list_item);
        //设置适配器
        adapter = new NewsAdapter(this);
        lists.setAdapter(adapter);

        //下啦刷新
        lists.setPullLoadEnable(true);
        //给Xlist 设置监听事件
        lists.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {//刷新
               page=1;
               //初始化数据
               initData();
            }

            @Override
            public void onLoadMore() { //下载
              initData();
            }
        });
        page=1;
        initData();
    }
    //接口的 位置
    private int page=1;
    private final int count=10;
    private String apiURL="http://172.17.8.100/movieApi/movie/v1/findHotMovieList?";
    @SuppressLint("StaticFieldLeak")
    private void initData() {
        AsyncTask<String, Void, List<Bean.Data>>  asyncTask = new AsyncTask<String, Void, List<Bean.Data>>() {
            @Override
            protected List<Bean.Data> doInBackground(String... strings) {
                try {
                    URL url = new URL(strings[0]);
                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                    urlConnection.setConnectTimeout(5000);
                    urlConnection.setReadTimeout(5000);
                    int responseCode = urlConnection.getResponseCode();
                    if (responseCode==200){
                        String result=stream2String(urlConnection.getInputStream());
                        Gson gson = new Gson();
                        Bean bean = gson.fromJson(result, Bean.class);

                        return bean.getResult();
                    }
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(List<Bean.Data> datas) {
                  //数据进行判断
                if (datas==null){
                    lists.stopLoadMore();
                    lists.stopRefresh();
                    return;
                }
                if (page==1){//刷新
                    adapter.setList(datas);
                }else{//下载
                    adapter.addData(datas);
                }
                //如果没有下一页了 则停止加载
                lists.setPullLoadEnable(datas.size()>=count);
                lists.stopRefresh();
                lists.stopLoadMore();
                page++;
            }
        }.execute(apiURL+"page="+page+"&count="+count);
    }

    private String stream2String(InputStream inputStream) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
        InputStreamReader ir = new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(ir);
        for (String tmp=br.readLine();tmp!=null;tmp=br.readLine()){
            stringBuilder.append(tmp);
        }
        return stringBuilder.toString();
    }
}

图片设置

package com.example.dell.myapplicationday1207;

import android.app.Application;
import android.graphics.Bitmap;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        ImageLoaderConfiguration configuration = new ImageLoaderConfiguration.Builder(this)
                .memoryCacheSize(10)
                .diskCacheSize(10*1024*1024)
                .defaultDisplayImageOptions(new DisplayImageOptions.Builder()
                   .bitmapConfig(Bitmap.Config.RGB_565)
                        .showImageOnFail(R.mipmap.ic_launcher)
                        .showImageForEmptyUri(R.mipmap.ic_launcher)
                        .showImageOnLoading(R.mipmap.ic_launcher)
                        .cacheInMemory(true)
                        .cacheOnDisk(true)
                        .build()
                ).build();
        ImageLoader.getInstance().init(configuration);
    }
}

Bean类

package com.example.dell.myapplicationday1207;

import java.io.Serializable;
import java.util.List;

public class Bean {
    private String message;
    private String status;
    private List<Data> result;

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<Data> getResult() {
        return result;
    }

    public void setResult(List<Data> result) {
        this.result = result;
    }

    class Data{
        private String name;
        private String summary;
        private String imageUrl;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getSummary() {
            return summary;
        }

        public void setSummary(String summary) {
            this.summary = summary;
        }

        public String getImageUrl() {
            return imageUrl;
        }

        public void setImageUrl(String imageUrl) {
            this.imageUrl = imageUrl;
        }
    }
}

适配器

在这里插入代码片package com.example.dell.myapplicationday1207;

import android.content.Context;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
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.ArrayList;
import java.util.List;
import java.util.TreeMap;

public class NewsAdapter extends BaseAdapter {
   private Context context;
   private List<Bean.Data> list;

    public NewsAdapter(Context context) {
        this.context = context;
        list=new ArrayList<>();
    }
//更新放法
    public void setList(List<Bean.Data> list) {
        if (list!=null){
            this.list = list;
        }
         notifyDataSetChanged();
    }
    //追加数据
    public void addData(List<Bean.Data> b){
        if (b!=null){
            list.addAll(b);
        }
        notifyDataSetChanged();
    }

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

    @Override
    public Bean.Data getItem(int position) {
        return list.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView==null){
            viewHolder = new ViewHolder();
            convertView=LayoutInflater.from(context).inflate(R.layout.xlist,parent,false);
            viewHolder.text = convertView.findViewById(R.id.text1);
            viewHolder.title = convertView.findViewById(R.id.title1);
            viewHolder.img = convertView.findViewById(R.id.image01);
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.title.setText(list.get(position).getName());
        viewHolder.text.setText(list.get(position).getSummary());
        ImageLoader.getInstance().displayImage(list.get(position).getImageUrl(),viewHolder.img);
        return convertView;
    }
    class ViewHolder{
        TextView text;
        TextView title;
        ImageView img;
    }
}