Android NoConnectionError: java.io.IOException: Cleartext HTTP traffic to xxx not permitted solution

The cause of the problem is:

Google said that in order to ensure the security of user data and devices, applications for the next-generation Android system (Android P) will require encrypted connections by default, which means that Android P will prohibit apps from using all unencrypted connections, so running Android No matter whether the Android device of the P system is receiving or sending traffic, it will not be able to transmit in plain text in the future. It needs to use the next-generation (Transport Layer Security) transport layer security protocol, while Android Nougat and Oreo will not be affected.

Solution:

1. Using the HTTPS protocol avoids unencrypted requests.

2. TargetSdkVersion drops below 27.

3. Add network security configuration xml.

Add a new xml directory under res, create a file named: urls_config.xml (the name can also be customized), the content is as follows:

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

Add the following attributes to the application tag under the AndroidManifest.xml file of the APP:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.xxxx.xxx">

    <uses-permission android:name="android.permission.INTERNET" />
<application
        ...
    android:networkSecurityConfig="@xml/urls_config"
        ...
    >
</manifest>

4. Add the <code>android:usesCleartextTraffic attribute under the Application tag.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.xxxx.xxx">

    <uses-permission android:name="android.permission.INTERNET" />
<application
        ...
    android:usesCleartextTraffic="true"
        ...
    >
</manifest>