使用react-native-ble-manager获取可用蓝牙设备列表

Question

如何使用 react-native-ble-manager 获取可用蓝牙设备列表？

- sergei

Answer 1

1. First you should:

   import BleManager from 'react-native-ble-manager';
   

   and don't forget:

   import { NativeAppEventEmitter } from 'react-native'
   

2. Then, inside of your component (I'm doing on componentDidMount):

   2.1. Add Handle to NativeAppEventEmitter on 'BleManagerDiscoverPeripheral' event:

   NativeAppEventEmitter.addListener('BleManagerDiscoverPeripheral',(data) => 
       {
         console.log(data) // Name of peripheral device
       });
   

   2.2. Start your BleManager manager:

   BleManager.start({showAlert: false});
   

   2.3. BleManager.scan([], 30) where first value is an array if service UUID, second is seconds how long scan will run

您可以在官方库页面 react-native-ble-manager 上找到原始示例。

- Alex Shtromberg

---

我正在做同样的事情，但它没有显示我附近设备的蓝牙列表。 - chirag prajapati

我也遇到了同样的问题。你找到解决办法了吗？？ - Rehan

Answer 2

最近我不得不使用这个库，以下是我的解决方法：

import { NativeModules, NativeEventEmitter } from 'react-native';
import BleManager from 'react-native-ble-manager';

const BleManagerModule = NativeModules.BleManager;
const bleManagerEmitter = new NativeEventEmitter(BleManagerModule);

...

state = {
  peripherals: new Map(),
};

componentDidMount() {
  BleManager.start({ showAlert: false })

  this.handlerDiscover = bleManagerEmitter.addListener(
    'BleManagerDiscoverPeripheral',
    this.handleDiscoverPeripheral
  );

  this.handlerStop = bleManagerEmitter.addListener(
    'BleManagerStopScan',
    this.handleStopScan
  );

  this.scanForDevices(); // I chose to start scanning for devices here
}

scanForDevices() {
  BleManager.scan([], 15);
}

handleDiscoverPeripheral = (peripheral) => {
  const { peripherals } = this.state;

  if (peripheral.name) {
    peripherals.set(peripheral.id, peripheral.name);
  }
  this.setState({ peripherals });
};

handleStopScan = () => {
  console.log('Scan is stopped. Devices: ', this.state.peripherals);
}

编辑：别忘了请求位置权限！

- denisas

Answer 3

使用以下代码扫描附近的设备：

scanNearByDevices(serviceUUIDList, duration, isAllowDuplicates) {
bleManager
  .scan(serviceUUIDList, duration, isAllowDuplicates)
  .then(results => {
    console.log('Scanning...');
    // this.setState({scanning: true});
  });
}

然后使用以下代码获取发现设备列表：

getDiscoverdDevices() {
return new Promise((resolve, reject) => {
 bleManager
    .getDiscoveredPeripherals()
    .then(devices => {
      console.log('Discovered devices:', devices);
      this.deviceMap.set(device.id, device);
      }
      resolve(devices);
    })
    .catch(error => {
      console.log('error fail: ', error);
      reject(error);
    });
});
}

如果您正在运行Android应用程序，请确保已向您的应用程序授予位置权限

- parth