Android P 禁止了http连接？（WTF！数据请求失败，图片也加载不出来）
LogCat错误日志显示：
... CLEARTEXT communication not permitted by network security policy ...

解决方法

最简单的解决方法就是明确指定接受某些主机的明文。

• 添加安全配置文件

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

• main -> res -> xml 新建network_security_config.xml

1. 允许指定http链接

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <domain-config>
        <domain includeSubdomains="true">example1.com</domain>
        <domain includeSubdomains="true">example2.com</domain>
    </domain-config>
</network-security-config>

2. 允许所有http链接

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true">
        <trust-anchors>
            <certificates src="system" />
            <certificates src="user" />
        </trust-anchors>
    </base-config>
</network-security-config>

就这样！

参考文档：
Android P - CLEARTEXT communication not permitted by network security policy
网络安全性配置 | Google Developers