I'm new to React native. In the application, the pronunciation of the words is heard with the TTS package. When I use this package, I get an warning as follows. This warning only happens on android. There is no problem on iOS. This warning ing as the app is opened. How can I fix this?

Warning:

TTS package settings:

import { Platform } from "react-native"
import Tts from "react-native-tts"

export class VocalizationUtil {
    constructor() {
        Tts.setDefaultLanguage("en-IE").catch(error => { })
    }

    iosConfig = {
        iosVoiceId: ".apple.ttsbundle.Moira-pact", //which voice to use
        rate: 0.5, //speech rate
    }

    androidConfig = {
        KEY_PARAM_PAN: 0,
        KEY_PARAM_VOLUME: 0.5, // 0 means silence
        KEY_PARAM_STREAM: "STREAM_MUSIC"
    }

    // Subscribe to TTS events
    createListeners() {
        Tts.addEventListener("tts-start", event => { })
        Tts.addEventListener("tts-finish", event => { })
        Tts.addEventListener("tts-cancel", event => { })
    }

    async voiceTheText(text) {

        this.createListeners()
        Tts.stop()  //Stop speaking and flush the TTS queue.

        // if text-to-speech engine is not installed, request the installation
        Tts.getInitStatus()
            .then(() => {
                Tts.speak(`${text}`, Platform.OS === "android" ? this.androidConfig : this.iosConfig)
            })
            .catch(error => { })

    }

}

I'm new to React native. In the application, the pronunciation of the words is heard with the TTS package. When I use this package, I get an warning as follows. This warning only happens on android. There is no problem on iOS. This warning ing as the app is opened. How can I fix this?

Warning:

TTS package settings:

import { Platform } from "react-native"
import Tts from "react-native-tts"

export class VocalizationUtil {
    constructor() {
        Tts.setDefaultLanguage("en-IE").catch(error => { })
    }

    iosConfig = {
        iosVoiceId: ".apple.ttsbundle.Moira-pact", //which voice to use
        rate: 0.5, //speech rate
    }

    androidConfig = {
        KEY_PARAM_PAN: 0,
        KEY_PARAM_VOLUME: 0.5, // 0 means silence
        KEY_PARAM_STREAM: "STREAM_MUSIC"
    }

    // Subscribe to TTS events
    createListeners() {
        Tts.addEventListener("tts-start", event => { })
        Tts.addEventListener("tts-finish", event => { })
        Tts.addEventListener("tts-cancel", event => { })
    }

    async voiceTheText(text) {

        this.createListeners()
        Tts.stop()  //Stop speaking and flush the TTS queue.

        // if text-to-speech engine is not installed, request the installation
        Tts.getInitStatus()
            .then(() => {
                Tts.speak(`${text}`, Platform.OS === "android" ? this.androidConfig : this.iosConfig)
            })
            .catch(error => { })

    }

}

• javascript
• react-native
• text-to-speech

2 Answers 2

Thanks to @Langarus for the reply. I added the short solution here for those who encounter this problem.

For all packages where you get this warning, add the following code to the package's ..Module.java file. For example, for the TTS package, add the following code to node_modules/react-native-tts/android/src/main/java/net/no_mad/tts/TextToSpeechModule.java

   @ReactMethod
   public void addListener(String eventName) {
     // Keep: Required for RN built in Event Emitter Calls.
   }
   @ReactMethod
   public void removeListeners(Integer count) {
     // Keep: Required for RN built in Event Emitter Calls.
   }

1. In case you are using removeEventListener, that was deprecated https://reactnative.dev/docs/appstate#removeeventlistener You have a codeSnippet on the top of the page on how to use .remove() instead of removeEventLister

2. In case you are using react-native-reanimated or drawer it seems that the problem es from the libraries not being updated. https://github./react-navigation/react-navigation/issues/9882

If you want to silence it new NativeEventEmitter()` was called with a non-null argument without the required `addListener` method