App

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="ru.dc09.replaceinput">
+
+    <application
+        android:allowBackup="true"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        tools:targetApi="31">
+        <service
+            android:name=".ReplaceInputService"
+            android:exported="true"
+            android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.accessibilityservice.AccessibilityService" />
+            </intent-filter>
+            <meta-data
+                android:name="android.accessibilityservice"
+                android:resource="@xml/service_config" />
+        </service>
+    </application>
+
+</manifest>

app/src/main/java/ru/dc09/replaceinput/ReplaceInputService.kt

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+package ru.dc09.replaceinput
+
+import android.accessibilityservice.AccessibilityService
+import android.os.Bundle
+import android.view.accessibility.AccessibilityEvent
+import android.view.accessibility.AccessibilityNodeInfo
+
+class ReplaceInputService : AccessibilityService() {
+    override fun onInterrupt() {}
+    override fun onAccessibilityEvent(event: AccessibilityEvent?) {
+
+        if (event == null || event.source == null) return
+
+        val field: AccessibilityNodeInfo = event.source
+        val txt: String = field.text?.toString()
+            ?.lowercase()
+            ?.replace('ё', 'е')
+            ?: ""
+
+        val args = Bundle()
+        args.putCharSequence(
+            AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE,
+            txt
+        )
+        field.performAction(AccessibilityNodeInfo.ACTION_SET_TEXT, args)
+    }
+}

app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">Replace Input</string>
+</resources>

app/src/main/res/xml/service_config.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<accessibility-service xmlns:android="http://schemas.android.com/apk/res/android"
+    android:accessibilityEventTypes="typeViewTextChanged"
+    android:accessibilityFlags="flagDefault"
+    android:accessibilityFeedbackType="feedbackAllMask"
+    android:notificationTimeout="100"
+    android:canRetrieveWindowContent="true"
+/>