MainActivity

package com.jq.demo;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.TextView;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "";
    private TextView textView;
    private String  Html;
    Handler handler=new Handler(){
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            if(msg.what==0x123) {
                Log.e(TAG, "handleMessage: " + (String)msg.obj);
                textView.setText((String)msg.obj);
                //textView.append((String)msg.obj);
            }

        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView=(TextView)findViewById(R.id.textv);
        // Android 4.0 之后不能在主线程中请求HTTP请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpHelp httpHelp = new HttpHelp();
                try {
                    VideoServiceTest test=new VideoServiceTest();
                    test.testLocalIpAndMac();
                    //Log.e(TAG, "onCreate: " + httpHelp.Go("GET", "https://www.baidu.com", ""));
                    //Html=httpHelp.Go("GET", "http://10.0.2.2:8080/hello?name=xiexuzhao", "");
                    Html=httpHelp.Go("GET", "http://10.0.2.2:52318/api/values", "");
                    Log.e(TAG, "onCreate: " + Html);
                    Message message=new Message();
                    message.what=0x123;
                    message.obj=Html;
                    handler.sendMessage(message);

                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}