Question

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

Answer 1

我最近不得不使用这个库，这对我有用：

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：不要忘记寻求位置的许可！

Answer 2

首先你应该：

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

并且不要忘记：

import { NativeAppEventEmittem } from 'react-native'

然后，在你的组件内部（我在componentDidMount上）：

2.1。在NativeAppEventEmitter事件中将句柄添加到'BleManagerDiscoverPeripheral'：
```
NativeAppEventEmitter.addListener('BleManagerDiscoverPeripheral',(data) => 
    {
      console.log(data)
    });/*Name of peripheral device*/
```
2.2。启动BleManager管理器
```
BleManager.start({showAlert: false});`
```
2.3。 BleManager.scan([], 30)其中第一个值是服务UUID的数组，第二个是秒扫描的运行时间

您可以在官方lib的页面react-native-ble-manager

Answer 3

要扫描附近的设备，请使用以下代码，

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

之后，使用下面的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android上运行应用程序，请确保已为应用程序授予位置权限

使用react-native-ble-manager获取可用蓝牙设备列表

3 个答案: