今天在調(diào)試Android網(wǎng)絡(luò)模塊（用的Retrofit+OKHttp）的時候報錯：

java.net.UnknownServiceException: CLEARTEXT communication ** not permitted by network security policy

解決方案：
首先在 rsc/xml 目錄下建立 network_security_config.xml

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

然后在Manifest.xml中添加屬性：

<application
    android:networkSecurityConfig="@xml/network_security_config"
    ……