在使用BLE(蓝牙低功耗)技术获取心率值时,您可以使用以下解决方法:
// 初始化BLE适配器
BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
// 检查设备是否支持BLE
if (bluetoothAdapter == null || !bluetoothAdapter.isEnabled()) {
// 设备不支持BLE,或者未开启蓝牙
// 处理逻辑...
return;
}
// 开始扫描设备
bluetoothAdapter.startLeScan(mLeScanCallback);
private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() {
@Override
public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
// 找到设备后停止扫描
bluetoothAdapter.stopLeScan(this);
// 连接设备
device.connectGatt(MainActivity.this, false, mGattCallback);
}
};
private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothProfile.STATE_CONNECTED) {
// 连接成功后开始发现服务
gatt.discoverServices();
} else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
// 连接断开
// 处理逻辑...
}
}
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
// 获取心率服务
BluetoothGattService heartRateService = gatt.getService(UUID.fromString("0000180d-0000-1000-8000-00805f9b34fb"));
// 获取心率值特征
BluetoothGattCharacteristic heartRateCharacteristic = heartRateService.getCharacteristic(UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb"));
// 开启通知接收心率值变化
gatt.setCharacteristicNotification(heartRateCharacteristic, true);
// 配置心率值通知
BluetoothGattDescriptor descriptor = heartRateCharacteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
gatt.writeDescriptor(descriptor);
} else {
// 获取服务失败
// 处理逻辑...
}
}
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
if (characteristic.getUuid().equals(UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb"))) {
// 接收到心率值变化
int heartRate = characteristic.getIntValue(BluetoothGattCharacteristic.FORMAT_UINT8, 1);
Log.d(TAG, "Heart rate: " + heartRate);
}
}
};
上述代码示例展示了使用Android的BLE API获取心率值的基本流程。您需要根据实际情况修改UUID和处理逻辑,确保设备支持BLE和正确连接心率设备。