参考文章：https://www.jianshu.com/p/5aba3b19a3e5
首先给app添加网络访问权限
在AndroidManifest.xml中添加
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
这样还不能够使用 ，需要给app添加证书
在AndroidManifest.xml中添加
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:networkSecurityConfig="@xml/network_security_config" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> </application>
并新建相关xml资源文件，路径如下：res/xml/network_security_config.xml
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config>
<domain includeSubdomains="true">example.com</domain>
<pin-set expiration="2018-01-01">
<pin digest="SHA-256">7HIpactkIAq2Y49orFOOQKurWxmmSFZhBCoQYcRhJ3Y=</pin>
<!-- backup pin -->
<pin digest="SHA-256">fwza0LRMXouZHRC8Ei+4PyuldPDcf3UKgO/04cDM1oE=</pin>
</pin-set>
</domain-config>
</network-security-config>
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
原文：https://www.cnblogs.com/sq-9701/p/11284353.html