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Example, we use socket.io-client-java:

mSocket = IO.socket("http://192.168.1.10:11111", opts);

And we see in Logcat:

No Network Security Config specified, using platform default

This occurs to the api 28 and above, because doesn’t accept http anymore, you need to change if you want to accept http or localhost requests.

Solution:
Step 1:

In Android Manifiest, in tag application add:

android:usesCleartextTraffic="true"
android:networkSecurityConfig="@xml/network_security_config"

Step 2:

create in folder app\src\main\res\xml this file network_security_config.xml and write this:

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

Step 3:
inside tag application add this tag:

<uses-library android:name="org.apache.http.legacy" android:required="false"/>