D/NetworkSecurityConfig: No Network Security Config specified, using platform default

 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>