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I have this AccessibilityService class working in Android Oreo (API 27) and before:

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.google.test.testaccessibility">

<application
 android:icon="@mipmap/ic_launcher"
 android:label="TestAccessibility">
<service
 android:name=".TestAccessibility"
 android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
 <intent-filter>
 <action android:name="android.accessibilityservice.AccessibilityService" />
 </intent-filter>

 <meta-data
 android:name="android.accessibilityservice"
 android:resource="@xml/test_accessibility" />
</service>
</application>

test_accessibility.xml

<?xml version="1.0" encoding="utf-8"?>
<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
android:accessibilityEventTypes="typeViewTextChanged"
android:accessibilityFeedbackType="feedbackGeneric"
android:accessibilityFlags="flagDefault"
android:canRetrieveWindowContent="true"
android:notificationTimeout="10" />

TestAccessibility.java
package com.google.test.testaccessibility;

import android.accessibilityservice.AccessibilityService;
import android.util.Log;
import android.view.accessibility.AccessibilityEvent;

public class TestAccessibility extends AccessibilityService 
 @Override
 public void onAccessibilityEvent(AccessibilityEvent event) 
 Log.d("TestAccessibility", "onAccessibilityEvent");
 

 @Override
 public void onInterrupt() 
 Log.d("TestAccessibility", "onInterrupt");
 

 @Override
 protected void onServiceConnected() 
 Log.d("TestAccessibility", "onServiceConnected");
 

It works and the method onAccessibilityEvent is called everytime a text is changed in any application but, when I run this code in an Android Pie (API 28) only the onServiceConnected one is called.
I suppose something has been changed in from API 27 to 28 but I can't find anything on the net.
Anyone can give me a clue?

Thank you!

Nothing changed intentionally, and most services work.

Two things to try:
1) Codelab for accessibility service development: https://codelabs.developers.google.com/codelabs/developing-android-a11y-service/index.html

2) Removing the notificationTimeout

It's a reported bug:

https://issuetracker.google.com/issues/117747909

I'll try to update this response with the bug's answer.