HTTP FAILED: java.net.UnknownServiceException: CLEARTEXT communication to 172.29.1.233 not permitted by network security policy
Q:高版本Android默认禁止Http请求，放开方式：
①在res/xml文件夹下创建network_security_config.xml文件，内容如下：

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

②在AndroidManifest.xml的application节点添加如下内容：

 android:networkSecurityConfig="@xml/network_security_config"

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