HttpURLConnection

package com.pingyijinren.test;

import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity{
    private Button button;
    private TextView textView;
    private static final int SHOW_RESPONSE=0;
    private Handler handler=new Handler(){
        public void handleMessage(Message message){
            switch(message.what){
                case SHOW_RESPONSE:
                    String response=(String)message.obj;
                    textView.setText(response);
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button=(Button)findViewById(R.id.button);
        textView=(TextView)findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendRequestWithHttpURLConnection();
            }
        });
    }

    private void sendRequestWithHttpURLConnection(){
        new Thread(new Runnable(){
            @Override
            public void run(){
                HttpURLConnection httpURLConnection=null;

                try{
                    URL url=new URL("https://www.baidu.com");
                    httpURLConnection=(HttpURLConnection)url.openConnection();
                    httpURLConnection.setRequestMethod("GET");
                    httpURLConnection.setConnectTimeout(8000);
                    httpURLConnection.setReadTimeout(8000);
                    InputStream in=httpURLConnection.getInputStream();
                    BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(in));
                    StringBuilder response=new StringBuilder();
                    String line;
                    while((line= bufferedReader.readLine())!=null){
                        response.append(line);
                    }

                    Message message=new Message();
                    message.what=SHOW_RESPONSE;
                    message.obj=response.toString();
                    handler.sendMessage(message);
                }
                catch(Exception e){
                    e.printStackTrace();
                }
                finally {
                    if(httpURLConnection!=null){
                        httpURLConnection.disconnect();
                    }
                }
            }
        }).start();
    }
}