Expo Pedometer is not counting current step

[sina_unforgiven3]

I used expo-sensors in my project but Pedometer.watchStepCount does not return any value.

1. SDK Version: 40.0.1
2. Platforms(Android/iOS/web/all): Android

Environment:

"dependencies": {
        "expo": "~40.0.0",
        "expo-sensors": "~9.2.0",
        "expo-status-bar": "~1.0.3",
        "react": "16.13.1",
        "react-dom": "16.13.1",
        "react-native": "https://github.com/expo/react-native/archive/sdk-40.0.1.tar.gz",
        "react-native-unimodules": "^0.12.0",
        "react-native-web": "~0.13.12"
      }

App.js

import { StatusBar } from 'expo-status-bar';
import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import { Pedometer } from 'expo-sensors';

export default class App extends React.Component {
  state = {
    isPedometerAvailable: 'checking',
    pastStepCount: 0,
    currentStepCount: 0,
  };

  componentDidMount() {
    this._subscribe();
  }

  componentWillUnmount() {
    this._unsubscribe();
  }

  _subscribe = () => {
    this._subscription = Pedometer.watchStepCount(result => {
      this.setState({
        currentStepCount: result.steps,
      });
    });

    Pedometer.isAvailableAsync().then(
      result => {
        this.setState({
          isPedometerAvailable: String(result),
        });
      },
      error => {
        this.setState({
          isPedometerAvailable: 'Could not get isPedometerAvailable: ' + error,
        });
      }
    );

    const end = new Date();
    const start = new Date();
    start.setDate(end.getDate() - 1);
    Pedometer.getStepCountAsync(start, end).then(
      result => {
        this.setState({ pastStepCount: result.steps });
      },
      error => {
        this.setState({
          pastStepCount: 'Could not get stepCount: ' + error,
        });
      }
    );
  };

  _unsubscribe = () => {
    this._subscription && this._subscription.remove();
    this._subscription = null;
  };

  render() {
    return (
      <View style={styles.container}>
        <Text>Pedometer.isAvailableAsync(): {this.state.isPedometerAvailable}</Text>
        <Text>Steps taken in the last 24 hours: {this.state.pastStepCount}</Text>
        <Text>Walk! And watch this go up: {this.state.currentStepCount}</Text>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});