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我无法在我的代码中启动 ble 管理器。我使用世博会。我尝试了很多在互联网上找到的解决方案，但没有一个对我有用。当我退出 blemanager.start 时，我的应用程序运行正常。我在 React native 中找不到任何关于 Promise 的文档……有我的代码。我真的希望你能帮助我。

import { Stylesheet, View, Text, Button, TouchableOpacity,FlatList, Alert,NativeAppEventEmitter } from 'react-native'
import donnee from '../Donnee/data'
import DataItem from './DataItem'
import FilmDetail from './FilmDetail';
import BleManager from 'react-native-ble-manager';
import React, { useState, useEffect } from 'react';
//import BleManager from 'react-native-ble-plx';
const width_proportion = '60%';
const Lwidth_proportion = '30%';
const maxwidth="100%";
const heightinside="12%";
const paddleft = '10%';
class Search extends React.Component {
  componentDidMount() {
    console.log('bluetooth scanner mounted');
    NativeAppEventEmitter.addListener('BleManagerDiscoverPeripheral',(data) => 
    {
        let device = 'device found: ' + data.name + '(' + data.id + ')'; 
        if(this.devices.indexOf(device) == -1) {
            this.devices.push(device);
        }
        let newState = this.state;
        newState.dataSource = newState.dataSource.cloneWithRows(this.devices);
        this.setState(newState);
    });
    BleManager.start({ showAlert: false }).then(() => {
        // Success code
        console.log("Module initialized");
      });
}
  startScanning() {
    console.log('start scanning');
}
    render() {
        return (
        <View>
          <View style={styles.entete}></View>
          <View>
            <TouchableOpacity style = {styles.filtrebtn}  onPress={() => this.props.navigation.navigate("FilmDetail")}>
              <Text style = {styles.textfiltre}>FILTRES</Text>
            </TouchableOpacity>
            <TouchableOpacity style = {styles.scan}  onPress={() => this.startScanning()}>
              <Text style = {styles.textscan}>SCAN</Text>
            </TouchableOpacity>
          </View>
          <View>
               <FlatList 
               data={donnee} 
               keyExtractor={(item) => item.id.toString()} 
               renderItem={({item}) =><DataItem donnees={item}/> }  />
          </View>
        </View>
          
        )
    }
}
export default Search
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