react-native-ble-plx 移动到 npm 模块内时不会运行

Question

因为我将有多个应用程序使用相同的实现来连接到 BLE 设备，所以我尝试将该代码移动到模块内。然而，我遇到了一个奇怪的问题，当相同的代码在应用程序内的文件夹内工作时，扫描代码在模块内不起作用。

我已经使用以下代码进行了测试：

import {
  BleError,
  BleManager,
  Device as BlxDevice,
  LogLevel,
} from 'react-native-ble-plx';
import { PermissionsAndroid } from 'react-native';

const manager = new BleManager();
manager.setLogLevel(LogLevel.Verbose);

export const tryScan = () => {
  console.log('In main app');
  PermissionsAndroid.request(
    PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
  );

  PermissionsAndroid.request(
    PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
  ),
    manager.startDeviceScan(
      null,
      { allowDuplicates: true },
      (error: BleError | null, scannedDevice: BlxDevice | null) => {
        console.log('Discovered device', scannedDevice);
        manager.stopDeviceScan();
      },
    );
};

当在模块内部时，根本没有发现任何设备，当在应用程序中不作为模块时，它按预期工作。

该模块具有本机库作为对等依赖项：

  "peerDependencies": {
    "react-native": "^0.64.x",
    "react-native-ble-plx": "^2.x"
  },

应用程序以这种方式包含模块

  "dependencies": {
    "device-control": "file:../device-control",
  },

我已验证我在应用程序的 node_modules 中拥有正确的代码。

让我更加困惑的是，在使用react-native-ble-plx的应用程序中，可以使用

manager.onStateChange

来监控BLE状态。

我在logcat中没有发现错误，在metro中也没有发现错误。谁能告诉我错误的原因是什么？

Answer 1

我也面临着同样的问题。除非您不需要编译 SDK，否则我确实从

33

下载了它到

31

。同时降级目标 SDK。我尚未测试不同的配置，但此配置适用于我的原型项目。

buildToolsVersion = "29.0.3"

minSdkVersion = 23

compileSdkVersion = 31

targetSdkVersion = 30

我请求这些权限：

const _PERMISSIONS = [
  PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
  PermissionsAndroid.PERMISSIONS.ACCESS_COARSE_LOCATION,
  PermissionsAndroid.PERMISSIONS.BLUETOOTH_SCAN,
  PermissionsAndroid.PERMISSIONS.BLUETOOTH_CONNECT
];

if (Platform.OS != "android") return;
const granted = await PermissionsAndroid.requestMultiple(_PERMISSIONS);

AndroidManifest.xml

<!-- Need ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission in 
Android API 23+ -->
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

  <uses-permission android:name="android.permission.BLUETOOTH" />
  <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
  <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

  <uses-feature android:name="android.hardware.bluetooth" android:required="true"/>
  <uses-feature android:name="android.hardware.bluetooth_le" android:required="true" />

Answer 2

我在 IOS 上也遇到了同样的问题。有没有人想出解决办法？ 我正在使用：

"react-native": "0.74.2",
"react-native-ble-plx": "^3.2.0",

我的 info.plist 包含：

<key>NSBluetoothAlwaysUsageDescription</key>
<string>We need access to Bluetooth to connect to nearby devices.</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>We need access to Bluetooth to connect to nearby devices.</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>We need your location to scan for Bluetooth devices.</string>
<key>UIBackgroundModes</key>
<array>
    <string>bluetooth-central</string>
    <string>bluetooth-peripheral</string>
    <string>external-accessory</string>
    <string>fetch</string>
    <string>processing</string>
</array>