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activity_main 

 MainActivity

package com.etime.myproject;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.Button;import android.widget.TextView;import androidx.annotation.NonNull;import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;/** * 网络请求需添加权限 * 
    */public class MainActivity extends Activity {    private TextView mResponseTextView;    private Button mSendRequestButton;    private Handler mHandler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }    private void init(){        //创建Handler        mHandler=new MyHandler();        mResponseTextView = (TextView) findViewById(R.id.responseTextView);        mSendRequestButton = (Button) findViewById(R.id.sendRequestButton);        mSendRequestButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                MyThread myThread=new MyThread();                myThread.start();            }        });    }    private class MyHandler extends Handler{        @Override        public void handleMessage(@NonNull Message msg) {            super.handleMessage(msg);            //处理消息            int what=msg.what;            if(what==1){                String message=(String)msg.obj;                //更新UI                mResponseTextView.setText(message);            }        }    }    private class MyThread extends Thread{        @Override        public void run() {            super.run();            HttpURLConnection connection = null;            InputStream is=null;            ByteArrayOutputStream bos=null;            try {                //创建URL                URL url = new URL("https://www.baidu.com/");                //打开链接                connection = (HttpURLConnection) url.openConnection();                //设置请求方式                connection.setRequestMethod("GET");                //建立链接                connection.connect();                //获取响应码                int responseCode=connection.getResponseCode();                if (responseCode == HttpURLConnection.HTTP_OK) {                    //读取数据                    is = connection.getInputStream();                    bos = new ByteArrayOutputStream();                    int len = 0;                    byte buffer[] = new byte[1024*2];                    while ((len = is.read(buffer)) != -1) {                        bos.write(buffer, 0, len);                    }                    //处理数据                    String response = new String(bos.toByteArray());                    //创建消息                    Message message=new Message();                    message.what=1;                    message.obj=response;                    //发送消息                    mHandler.sendMessage(message);                }            } catch (Exception e) {                e.printStackTrace();            } finally {                //释放资源                if (is != null) {                    try {                        is.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }                if (bos != null) {                    try {                        bos.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }                if (connection != null) {                    connection.disconnect();                }            }        }    }}

AndroidManifest.xml

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