Hey !
Thanks for reporting this. I updated the example code, can you try again and report back ?

Fixed in #91.

Solved. Thanks so much.

In case anyone else is new to react-native and doesn't realize this, you need to restart (either via react-native run-ios or react-native run-android or through the IDEs) after doing react-native link react-native-audio -- the js reloading won't pick up the newly linked native libraries.

This issue seems to still persist unless i'm missing something?

Running on Android emulator and on android device
React Native 0.40
react-native-audio 3.10.8
run:
rnpm link react-native-audio
react-native link react-native-audio

Restarted with entirely new project.

Added permission to AndroidManifest.xml

Below is the code snippet which I think it might be having problems with.

import {
Platform,
PermissionsAndroid,
} from 'react-native';
import { AudioRecorder, AudioUtils } from 'react-native-audio';

class RecordScene extends Component {

state = {
  currentTime: 0.0,
  recording: false,
  finished: false,
  //Must change back to DocumentDirectoryPath for release. However no directory path 
  audioPath: AudioUtils.MusicDirectoryPath + '/test.aac',
  hasPermission: undefined,
};

prepareRecordingPath(audioPath){
    AudioRecorder.prepareRecordingAtPath(audioPath, {
        SampleRate: 22050,
        Channels: 1,
        AudioQuality: "Low",
        AudioEncoding: "aac",
        AudioEncodingBitRate: 32000
    });
}

componentDidMount() {
  this._checkPermission().then((hasPermission) => {
    this.setState({ hasPermission });

    if (!hasPermission) return;

  });
}

_checkPermission() {
  if (Platform.OS !== 'android') {
    return Promise.resolve(true);
  }

  const rationale = {
    'title': 'Microphone Permission',
    'message': 'AudioExample needs access to your microphone so you can record audio.'
  };

  return PermissionsAndroid.request(PermissionsAndroid.PERMISSIONS.RECORD_AUDIO, rationale)
    .then((result) => {
      console.log('Permission result:', result);
      return (result === true || result === PermissionsAndroid.RESULTS.GRANTED);
    });
}

_record() {
	this.prepareRecordingPath(this.state.audioPath);
	AudioRecorder.startRecording();
	this.setState({recording: true});
}

I got the same problem, can you solve it?

I got the same problem.
RN 0.44
react-native-audio 3.2.2

[update]
sorry for the wrong comment.
After confirmation, it require ios rebuild before testing
It's okay to me now.

react-native link react-native-audio
cd ios && pod install && cd ..
delete app in your device
react-native run-ios
close the terminal with starting the server
react-native start --reset-cache