HttpURLConnection的使用

最新推荐文章于 2019-02-13 19:26:24 发布

qq_41651182

最新推荐文章于 2019-02-13 19:26:24 发布

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本文链接：https://blog.youkuaiyun.com/qq_41651182/article/details/80304911

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本文介绍了一个使用Android支持库的Fragment来展示新闻列表的应用案例。该Fragment通过异步线程从指定URL获取JSON格式的数据，并利用Gson库解析数据到自定义的NewsBean对象列表中。同时，使用自定义的MyAdapter适配器将数据绑定到ListView上。

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package com.example.user.day5_zhoukaomoni_3.fragment;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.user.day5_zhoukaomoni_3.R;
import com.example.user.day5_zhoukaomoni_3.adapter.MyAdapter;
import com.example.user.day5_zhoukaomoni_3.bean.NewsBean;
import com.example.user.day5_zhoukaomoni_3.http.HttpConfig;
import com.example.user.day5_zhoukaomoni_3.utils.ConmentUtil;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.io.InputStream;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.LinkedList;
import java.util.List;

public class Fragment01 extends Fragment {
    private static final String TAG = "Fragment01";
    private final static int SUCCESS = 0;
    private final static int ERROR = 1;
    private MyHandler myHandler =new MyHandler();
    private ListView listView;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment01_layout,container,false);
        listView = view.findViewById(R.id.listview);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        new Thread(){
            @Override
            public void run() {
                try {
                    URL url = new URL(HttpConfig.ONE_URL);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setConnectTimeout(5000);
                    if(connection.getResponseCode()==200) {
                        //输入流
                        InputStream inputStream = connection.getInputStream();
                        String json = ConmentUtil.inputStream2String(inputStream);
                        Log.d(TAG, "run: 66666666666" + json);
                        Message message = new Message();
                        message.what = SUCCESS;
                        message.obj = json;
                        myHandler.sendMessage(message);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }

    class MyHandler extends Handler{
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case  SUCCESS:
                    String json = (String) msg.obj;
                    Log.d(TAG, "handleMessage: "+json);
                    Gson gson = new Gson();
                    //
//                    Type type = new TypeToken<LinkedList<NewsBean>>() {
//                    }.getType();
//                    LinkedList<NewsBean> list = gson.fromJson(json, type);
//                    List<NewsBean.ItemBean> item = list.get(0).getItem();

                    Type type = new TypeToken<LinkedList<NewsBean>>() {
                    }.getType();
                    LinkedList<NewsBean> list = gson.fromJson(json, type);
                    List<NewsBean.ItemBean> item = list.get(0).getItem();
                    MyAdapter myAdapter = new MyAdapter(getActivity(), item);
                    listView.setAdapter(myAdapter);
                    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                            Toast.makeText(getActivity(),"fdfd",Toast.LENGTH_LONG).show();
                        }
                    });
                    break;
            }
        }
    }
}