You may find in the project to maintain their own, in front of models used properly, but to more than Android p models, can not find a network request to the server, and suddenly very awkward.
报错 Cleartext HTTP traffic to xxx not permitted
Of course, as a developer is required to solve such problems.
Produce such reasons:
To ensure the security of user data and devices, Google Android system for the next generation (Android P) application, the default will be asked to use an encrypted connection, which means that Android P will prohibit the use of all App unencrypted connections, so running Android P system the Andrews device either receive or send traffic codes can not be transmitted next, the next required (transport layer security) transport layer security protocol.
Use OKHttp request appears
java.net.UnknownServiceException: CLEARTEXT communication ** not permitted by network security policy
on the device Android P system, if the non-encrypted application using the http request plaintext network traffic, the application will not cause the network request, https the is not affected in the same manner, if the application nested webview, webview only use https request.
This problem I recommend the solution:
Res folder is created under a xml folder, and then create a network_security_config.xml file, as follows:
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true" />
</network-security-config>
2. Subsequently, application tag in the file AndroidManifest.xml add the following properties:
<application
...
android:networkSecurityConfig="@xml/network_security_config"
...
/>
Completed, this time App can access the network.
If you do not want to be lazy, then modified to do so
(1) APP use https requests
（2）targetSdkVersion 降到27以下
（3）更改网络安全配置
注意 build 版本中 compileSdkVersion 需要在 24 以上
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