安卓原生HTTP协议访问网络

1xml内容

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Hello World!"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintHorizontal_bias="0.047"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent"

        app:layout_constraintVertical_bias="0.066"

        android:id="@+id/response_text"/>

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/button_http"

        android:text="按钮啊"

        />

</androidx.constraintlayout.widget.ConstraintLayout>

java内容

package com.example.helloworld;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.webkit.WebView;

import android.webkit.WebViewClient;

import android.widget.Button;

import android.widget.TextView;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

public class Main3Activityextends AppCompatActivityimplements View.OnClickListener{

TextViewresponseText;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main3);

        Button sendRequest = (Button) findViewById(R.id.button_http);

        responseText = (TextView) findViewById(R.id.response_text);

        sendRequest.setOnClickListener(this);

//        WebView webView = (WebView) findViewById(R.id.web_view);

//        webView.getSettings().setJavaScriptEnabled(true);

//        webView.setWebViewClient(new WebViewClient());

//        webView.loadUrl("Https://www.baidu.com");

    }

public void onClick(View v) {

if (v.getId()==R.id.button_http){

Log.d("dean","点击事件");

            sendRwq();

        }

}

private void sendRwq(){

Log.d("dean","发送事件");

        new Thread(new Runnable(){

public void run() {

HttpURLConnection connection =null;

                BufferedReader reader =null;

                try {

URL url =new URL("https://www.baidu.com");

                    connection = (HttpURLConnection) url.openConnection();

                    connection.setConnectTimeout(5000);

                    connection.setReadTimeout(5000);

                    InputStream in = connection.getInputStream();

                    //下面对数据流进行读取

                    reader =new BufferedReader(new InputStreamReader(in));

                    StringBuilder response =new StringBuilder();

                    String Line;

                    while ((Line=reader.readLine())!=null){

response.append(Line);

                    }

showResponse(response.toString());

                }catch (MalformedURLException e) {

e.printStackTrace();

                }catch (IOException e) {

e.printStackTrace();

                }

}

}).start();

        }

private void showResponse(final String response){

Log.d("dean","response");

        runOnUiThread(new Runnable() {

@Override

            public void run() {

responseText.setText(response);

            }

});

    }

}