java.net.UnknownServiceException

https://developer.android.com/training/articles/security-config

<?xml version="1.0" encoding="utf-8"?>
<manifest ... >
    <application       
        android:networkSecurityConfig="@xml/network_security_config"
        ... >
        ...
    </application>
</manifest>

res/xml/network_security_config.xml：

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
  <base-config cleartextTrafficPermitted="true" />
</network-security-config>