文章目錄

• • api27以前
  • • 配置文件申請網絡權限
    • 異步發送網絡請求
    • 使用HttpURLConnection
  • api27以后
  • • 換成商城api
  • Gsonfomat插件：

api27以前

配置文件申請網絡權限

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

異步發送網絡請求

使用HttpURLConnection

package com.kanxue.androidnetwork;import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View;import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.List; import java.util.Map; import java.util.Set;public class MainActivity extends AppCompatActivity {private static final String TAG = "MainActivity";@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void loadJson(View view){new Thread(new Runnable() {@Overridepublic void run() {try {URL url =new URL("http://192.168.31.65:9102/get/text");HttpURLConnection httpURLConnection =(HttpURLConnection)url.openConnection();httpURLConnection.setConnectTimeout(10000);httpURLConnection.setRequestMethod("GET");httpURLConnection.setRequestProperty("Accept-Language","zh-CN,zh;q=0.9");httpURLConnection.setRequestProperty("Accept-Encoding","gzip, deflate, br");httpURLConnection.setRequestProperty("Accept","*/*");httpURLConnection.connect();int responseCode=httpURLConnection.getResponseCode();if(responseCode==200){Map <String, List<String>> headerFields=httpURLConnection.getHeaderFields();Set <Map.Entry<String, List<String>>> entries=headerFields.entrySet();for (Map.Entry<String, List<String>> entry:entries){Log.d(TAG,entry.getKey() +"=="+entry.getValue());}Object content=httpURLConnection.getContent();Log.d(TAG,"content --->"+content);}} catch (Exception e) {e.printStackTrace();}}}).start();} }

InputStream inputStream =httpURLConnection.getInputStream(); BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(inputStream)); String line=bufferedReader.readLine();

api27以后

同樣的代碼，api29顯示如下報錯

在manifest里面application標簽加入一行代碼：

android:usesCleartextTraffic="true"

變成了這樣：

<applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:usesCleartextTraffic="true"android:theme="@style/Theme.AndroidNetWork" >

換成商城api

URL url =new URL("https://api.sunofbeaches.com/shop/discovery/categories");

android:networkSecurityConfig=""

usesCleartextTraffic直接寫成true就行，networkSecurityConfig需要寫一個網絡配置文件（在res目錄下創建一個xml目錄，xml目錄放一個關于網絡配置的xml文件）
https://developer.android.google.cn/training/articles/security-config#manifest

修改之后如下：

<?xml version="1.0" encoding="utf-8"?> <network-security-config><domain-config><domain includeSubdomains="true">sunofbeaches.com</domain><domain-config cleartextTrafficPermitted="true"><domain includeSubdomains="true">www.sunofbeaches.com</domain></domain-config></domain-config> </network-security-config>

這里為什么要那么改呢，因為我們案例訪問的網址是：

https://api.sunofbeaches.com/shop/discovery/categories

然后配置文件寫入androidManifest文件中，如下：

<applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:usesCleartextTraffic="true"android:networkSecurityConfig="@xml/network_sercurity"android:theme="@style/Theme.AndroidNetWork" >

Gsonfomat插件：

不能勾選這個：

總結

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