DoGet

一,
package com.example.zhoukaolianxi1;

import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private TextView first;
    private TextView second;
    private HUCFragment hucFragment;
    private HClientFragment hClientFragment;
    private FragmentManager manager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        first = findViewById(R.id.first);
        second = findViewById(R.id.second);

        hucFragment = new HUCFragment();
        hClientFragment = new HClientFragment();

        manager = getSupportFragmentManager();
        manager.beginTransaction()
                .add(R.id.content,hucFragment)
                .add(R.id.content,hClientFragment)
                .hide(hClientFragment)
                .commit();
        first.setOnClickListener(this);
        second.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.first:
                manager.beginTransaction().show(hucFragment).hide(hClientFragment).commit();
                break;
            case R.id.second:
                manager.beginTransaction().hide(hucFragment).show(hClientFragment).commit();
                break;
        }
    }
}

二，

package com.example.zhoukaolianxi1;

import android.net.http.AndroidHttpClient;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by 。。。。 on 2018/9/1.
 */

public class HttpUtils {



    public static String Doget(String urlstring){
        String result="";
        try {
            URL url=new URL(urlstring);
            HttpURLConnection connection= (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.setUseCaches(false);
            connection.setConnectTimeout(3000);
            connection.connect();
            int code=connection.getResponseCode();
            if(code==200){
                InputStream is=connection.getInputStream();
                result =jeixi(is);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    public static String get(String urlstring){
        String result="";
        HttpClient client=new DefaultHttpClient();
        HttpGet httpGet=new HttpGet(urlstring);
        try {
            HttpResponse response=client.execute(httpGet);
            int code=response.getStatusLine().getStatusCode();
            if(code==200){
                InputStream is=response.getEntity().getContent();
                result=jeixi(is);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    private static String jeixi(InputStream is) {
        String result="";
        try {
           ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] b=new byte[1024];
            int coutent=-1;
            while((coutent=is.read(b,0,b.length))!=-1){
                baos.write(b,0,coutent);
                baos.flush();
            }
            result=baos.toString();
            baos.close();
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}

三，

package com.example.zhoukaolianxi1;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import com.google.gson.Gson;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by 。。。。 on 2018/9/1.
 */

public class HClientFragment extends Fragment {
    private static final String URL = "http://120.27.23.105/product/getProductCatagory?cid=1";
    private ListView listView;
    private List<Categroy.DataBean> list;
    private CategroyAdapter adapter;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v=inflater.inflate(R.layout.first_fragment,container,false);
        listView = v.findViewById(R.id.lv_data);
        return v;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        list = new ArrayList<>();
        adapter = new CategroyAdapter(getActivity(),list);
        listView.setAdapter(adapter);
        new AsyncTask<String,Integer,String>(){

            @Override
            protected String doInBackground(String... strings) {
                String result=HttpUtils.get(strings[0]);
                return result;
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                if(!TextUtils.isEmpty(s)){
                    Gson gson=new Gson();
                    Categroy categroy=gson.fromJson(s,Categroy.class);
                    list.clear();
                    list.addAll(categroy.getData());
                    adapter.notifyDataSetChanged();
                }
            }
        }.execute(URL);
    }
}

四，

package com.example.zhoukaolianxi1;

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

import com.google.gson.Gson;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by 。。。。 on 2018/9/1.
 */

public class HUCFragment extends Fragment {
    private static final String URL = "https://www.zhaoapi.cn/quarter/getJokes?source=android&appVersion=101";
    private ListView listView;
    private JokeAdapter adapter;
    private List<Joke.DataBean> list;
    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 123:
                    String result= (String) msg.obj;
                    if(!TextUtils.isEmpty(result)){
                        Gson gson=new Gson();
                        Joke joke=gson.fromJson(result,Joke.class);
                        Log.i("aaaa",joke+"");
                        list.clear();
                        list.addAll(joke.getData());
                        adapter.notifyDataSetChanged();
                    }
                    break;

            }
        }
    };
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v=inflater.inflate(R.layout.first_fragment,container,false);
        listView = v.findViewById(R.id.lv_data);
        return v;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        list = new ArrayList<>();
        adapter = new JokeAdapter(getActivity(), list);
        listView.setAdapter(adapter);
        new Thread(new Runnable() {
            @Override
            public void run() {
                String result=HttpUtils.Doget(URL);
                Message msg=Message.obtain();
                msg.what=123;
                msg.obj=result;
                handler.sendMessage(msg);
            }
        }).start();
    }
}