HttpClient

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 org.apache.http.HttpEntity;
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 org.apache.http.util.EntityUtils;

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(){
                try{
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpGet httpGet=new HttpGet("https://www.baidu.com");
                    HttpResponse httpResponse=httpClient.execute(httpGet);
                    if(httpResponse.getStatusLine().getStatusCode()==200){
                        HttpEntity httpEntity=httpResponse.getEntity();
                        String response= EntityUtils.toString(httpEntity,"utf-8");

                        Message message=new Message();
                        message.what=SHOW_RESPONSE;
                        message.obj=response;
                        handler.sendMessage(message);
                    }
                }
                catch(Exception e){
                    e.printStackTrace();
                }


            }
        }).start();
    }
}