If you're seeing that kind of error: ERR_CLEARTEXT_NOT_PERMITTED when trying to open a localhost url into Webview in Android then you need to allow that to be possible opening, here's how to do it:
You need to create that xml file into res/xml:
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<base-config cleartextTrafficPermitted="true">
<trust-anchors>
<certificates src="system" />
</trust-anchors>
</base-config>
</network-security-config>
and after that in AndroidManifest.xml you need to add:
<application
...
android:networkSecurityConfig="@xml/network_security_config"
It's done.
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