网络连接+HttpClient+AsyncTask

重要：在build.gradle的android下加入一句话useLibrary 'org.apache.http.legacy'（原因：HttpClient已过时）

代码演示

JAVA

package com.bawei.zhangjinfeng20171105.frag;

import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.bawei.zhangjinfeng20171105.R;
import com.bawei.zhangjinfeng20171105.bean.Bean;
import com.bawei.zhangjinfeng20171105.util.Netstateutil;
import com.bawei.zhangjinfeng20171105.util.Netutil;
import com.google.gson.Gson;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.AllowAllHostnameVerifier;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by sky on 2017/11/05.
 */

public class Two extends Fragment {
    private ListView lv;
    List<Bean.NewslistBean> list=new ArrayList<>();
    private Myadaper m;
    String  surl="https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10";
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.f1_list, container, false);
        lv = view.findViewById(R.id.lv);
        return view;
    }@Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        m = new Two.Myadaper();
        lv.setAdapter(m);
        //创建数组用于判断
        String[] s={surl,"HttpClient"}; //获取网络连接的类型
        int type = Netstateutil.getNewType(getActivity());
        if(type!=-1){
            Toast.makeText(getActivity(),"我有网络",Toast.LENGTH_SHORT).show();
            AsyncTask<String, Void, String> execute = new MAsyncTask().execute(s);
        }else{
            Toast.makeText(getActivity(),"请检查网络",Toast.LENGTH_SHORT).show();
        }
    }

    public class Myadaper extends BaseAdapter {

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

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

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            if(view==null){
                view=View.inflate(getActivity(),R.layout.aa,null);
            }
            TextView tv=view.findViewById(R.id.tv);
            ImageView iv=view.findViewById(R.id.iv);
            tv.setText(list.get(i).getDescription());
            //用AsyncTask1传过去有参ImageView控件和接口.刷新图片
            new MAsyncTask1(iv).execute(list.get(i).getPicUrl());
            return view;
        }
    }
    /**
     * 泛型  第一个参数:传过来的url
     *      第二个参数 :进度
     *      第三个参数 :接口请求成功返回的东西(json,bitmap)
     */
    private class MAsyncTask1 extends AsyncTask<String,Void,Bitmap> {
        ImageView iv;
        public MAsyncTask1(ImageView iv) {
            this.iv=iv;
        }

        /**
         *  这个方法在子线程,在这个方法里进行联网操作
         * @param strings 可变参数,底层是数组,里面放的是传过来的参数;
         * @return
         */
        @Override
        protected Bitmap doInBackground(String... strings) {
            String string = strings[0];
            Bitmap bit = Netutil.getNetBitmap(string);
            return bit;
        }
        /**
         * 这个方法在主线程, 直接更新ui即可;
         * @param s s是doInBackground请求接口成功后返回的json
         */
        @Override
        protected void onPostExecute(Bitmap bitmap) {
            super.onPostExecute(bitmap);
            iv.setImageBitmap(bitmap);
        }
    }


    private class MAsyncTask extends AsyncTask<String,Void,String> {
        //这是子线程
        @Override
        protected String doInBackground(String... strings) {

            String url = strings[0];
            String ss = strings[1];
            if(ss.equals("HttpClient")) {
                //得到httpclient对象
                DefaultHttpClient client = new DefaultHttpClient();
                //封装get请求
                HttpGet hg = new HttpGet(url);
                //获取返回的response
                try {
                    //修改org.apache.http的主机名验证解决问题
                    SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier());
                    HttpResponse response = client.execute(hg);
                    //获取状态码
                    int statusCode = response.getStatusLine().getStatusCode();
                    if (statusCode == 200) {
                        //entiry 里面封装的数据;
                        HttpEntity entity = response.getEntity();
                        //这个result就是json字符串，剩下的就是解析工作了；
                        String s = EntityUtils.toString(entity);

                        return s;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return null;
        }
        //这个是主线程
        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            //解析s,  直接给控件展示;
            Gson g=new Gson();
            Bean bean = g.fromJson(s, Bean.class);
            List<Bean.NewslistBean> newslist = bean.getNewslist();
            list=newslist;
            m.notifyDataSetChanged();
        }
    }

}

其他所需类详见 点击打开链接（网络连接+HttpUrlConnection+AsyncTask）