HttpClient的使用

最新推荐文章于 2022-04-15 14:57:27 发布

原创最新推荐文章于 2022-04-15 14:57:27 发布 · 154 阅读

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本文介绍了一个使用AsyncTask从指定URL获取用户数据并显示在Fragment上的示例。通过HttpClient发起HTTP请求，利用Gson将JSON响应解析为UserBean对象，并设置TextView组件来展示用户的地址和姓名。

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package com.example.user.day5_zhoukaomoni_3.fragment;

import android.os.AsyncTask;
import android.os.Bundle;
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.TextView;

import com.example.user.day5_zhoukaomoni_3.R;
import com.example.user.day5_zhoukaomoni_3.bean.UserBean;
import com.example.user.day5_zhoukaomoni_3.http.HttpConfig;
import com.example.user.day5_zhoukaomoni_3.utils.ConmentUtil;
import com.google.gson.Gson;

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

import java.io.IOException;
import java.io.InputStream;

public class Fragment02 extends Fragment {
    private TextView addr;
    private TextView name;
    private static final String TAG = "Fragment02";
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment02_layout,container,false);
        addr = view.findViewById(R.id.fragment02_addr);
        name = view.findViewById(R.id.fragment02_name);
        return view;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        new MyTask().execute(HttpConfig.TWO_URL);
    }
    class MyTask extends AsyncTask<String,Void,String>{
        @Override
        protected String doInBackground(String... strings) {
            String url = strings[0];
            HttpClient client = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);
            /*
            * 1.执行
            * 2.执行行
            * 3.转换成json
            * 4.容器
            * 5.return json
            * */
            try {
                HttpResponse response  = client.execute(httpGet);
                StatusLine statusLine = response.getStatusLine();
                if(statusLine.getStatusCode()==200){
                    HttpEntity entity = response.getEntity();
                    InputStream inputStream = entity.getContent();
                    String json = ConmentUtil.inputStream2String(inputStream);
                    Log.d(TAG, "doInBackground: "+json);
                    return  json;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Gson gson = new Gson();
            UserBean userBean = gson.fromJson(s,UserBean.class);
            addr.setText(userBean.getData().getAddr());
            name.setText(userBean.getData().getName());
        }
    }
}