无法使用反应原生蓝牙

Question

我在我的应用程序中添加了 react-native-ble-plx。我还使用 react native link cmd 链接了它。我已遵循 lib 文档中提供的所有必需步骤。但它不工作。我从不要求用户许可，并且它给出了错误 Deivce 无权使用 BluetoothLE。这是我的代码

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.smartdeviceiot">
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.BLUETOOTH"/>
   <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
   <uses-permission-sdk-23 android:name="android.permission.ACCESS_COARSE_LOCATION"/>
   <uses-sdk
                 android:minSdkVersion="18"
                 android:targetSdkVersion="23"/> 

设备搜索.js

从 '../constants/colors' 导入颜色；从“../constants/images”导入图像；import { Button, Icon, Text, Container, Header, Left, Body, Title, Right } from 'native-base'; 从 './styles/home' 导入 { HomeStyle }; import { BleManager } from'react-native-ble-plx' class DevicesSearch extends Component { static navigationOptions = { title: 'DevicesSearch' }; 构造函数（道具）{ 超级（道具）；const manager = new BleManager(); this.state = { }; } componentWillMount() { } render() { return ( >this.props.navigation.navigate("DrawerOpen")}> 设备搜索搜索设备）；} scanAndConnect = () => { alert('asd') console.log('cal'); this.manager.startDeviceScan(null, null, (error, device) => { this.info("Scanning..."); console.log(device);

      if (error) {
        this.error(error.message);
        return
      }

      if (device.name ==='MyDevice') {
        this.info("Connecting to Tappy");
        this.manager.stopDeviceScan();

        device.connect()
          .then((device) => {
            this.info("Discovering services and characteristics");
            return device.discoverAllServicesAndCharacteristics()
          })
          .then((device) => {
            this.info(device.id);
            device.writeCharacteristicWithResponseForService('12ab', '34cd',

'aGVsbG8gbWlzcyB0YXBweQ==') .then((characteristic) => { this.info(characteristic.value); return }) }) .catch((error) => { this.error(error.message) }) } } ); } } function mapStateToProps(state) { //传递提供者 return { } } /* Map Actions to Props */ function mapDispatchToProps(dispatch) >{ return { actions: bindActionCreators({ }, dispatch) }; } 导出默认连接( mapStateToProps, mapDispatchToProps )(DevicesSearch);

如果我的蓝牙关闭代码 console.log 我蓝牙已关闭，但是当它打开时我登录我该设备不是使用蓝牙的授权。我也厌倦了使用 AndroidPermission lib 但没有成功。它不需要用户的许可

Answer 1

您需要明确地向用户询问权限。我遇到了同样的问题，我通过在单独的文件中添加此代码来解决它：

export async function requestLocationPermission() {
  try {
    const granted = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.ACCESS_COARSE_LOCATION, {
        title: 'Location permission for bluetooth scanning',
        message: 'wahtever',
        buttonNeutral: 'Ask Me Later',
        buttonNegative: 'Cancel',
        buttonPositive: 'OK',
      },
    ); 
    if (granted === PermissionsAndroid.RESULTS.GRANTED) {
      console.log('Location permission for bluetooth scanning granted');
      return true;
    } else {
      console.log('Location permission for bluetooth scanning revoked');
      return false;
    }
  } catch (err) {
    console.warn(err);
    return false;
  }
}

然后当我需要扫描时，在实际扫描代码之前，我执行以下操作：

  scanAndConnect() {
    const permission = requestLocationPermission();
    if (permission) {        
      ...here I scan because the user has given permission