使用react-native-ble-plx库进行开发

安装

yarn add react-native-ble-plx
// 辅助数据发送接收buffer工具类
yarn add buffer
react-native link react-native-ble-plx
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android

修改build.gradle中的最低sdk版本为18

android {...defaultConfig {minSdkVersion 18...
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添加权限

<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"/><!-- Add this line if your application always requires BLE. More info can be found on:https://developer.android.com/guide/topics/connectivity/bluetooth-le.html#permissions-->
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>
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使用

android权限申请

const permissions: Permission[] = ['android.permission.ACCESS_COARSE_LOCATION'];if (Platform.OS == "android") {for (const permission of permissions) {const check = await PermissionsAndroid.check(permission);console.log(`permission ${permission} check ${check}`);if (!check) {await PermissionsAndroid.request(permission);}}
}
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实例初始化

const bleManager = new BleManager();
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打开蓝牙

const state = await this.bleManager.state();
if (state == State.PoweredOff) {if (Platform.OS == 'android') {const enable = await this.bleManager.enable();console.log(await this.bleManager.state());} else if (Platform.OS == 'ios') {// ios不能直接打开，用对话框提示打开蓝牙}
}
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扫描设备

bleManager.startDeviceScan(null, null, async (error, device) => {if (error) return console.error(error);// 打印设备名称console.log(device.name);
});
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连接设备

uuid连接

bleManager.connectToDevice(id);
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device连接

device.connect();
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获取characteristic

const serviceDevice = await device.discoverAllServicesAndCharacteristics();
const services = await serviceDevice.services();
for (const service of services) {const serviceUUID = service.uuid;// 判断service是否符合if (match) {const characteristics = await service.characteristics();for (const characteristic of characteristics) {const characteristicUUID = characteristic.uuid;// 判断characteristic是否符合if (match) {// 获取读或者写characteristic}}}
}
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数据发送

const array = [0x00, 0x01, ...];
const openValueBase64 = new Buffer(array).toString('base64');
await writeCharacteristic!.writeWithoutResponse(openValueBase64);
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数据接收

// 监听
readCharacteristic.monitor((error, characteristic) => {if (error) return console.error(error);const value = characteristic!.value!;const buffer = Buffer.from(value, 'base64');// 打印读取到的数据console.log('read', buffer);
});
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