android ble 根据UUID接受数据操作
时间: 2023-08-19 18:03:50 浏览: 137
android ble
在 Android BLE 中,接收数据的操作需要通过回调函数来实现。下面是一些示例代码,演示如何使用 UUID 接收数据:
1. 定义一个 UUID 对象:
```
private static final UUID SERVICE_UUID = UUID.fromString("0000180D-0000-1000-8000-00805f9b34fb");
private static final UUID CHARACTERISTIC_UUID = UUID.fromString("00002A37-0000-1000-8000-00805f9b34fb");
```
2. 在你的 BLE 设备连接成功后,找到对应的服务和特征:
```
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
BluetoothGattService service = gatt.getService(SERVICE_UUID);
BluetoothGattCharacteristic characteristic = service.getCharacteristic(CHARACTERISTIC_UUID);
gatt.setCharacteristicNotification(characteristic, true);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(CLIENT_CHARACTERISTIC_CONFIG));
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
gatt.writeDescriptor(descriptor);
}
}
```
3. 在特征值改变时,回调函数会被调用:
```
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
// 处理接收到的数据
byte[] data = characteristic.getValue();
String result = new String(data);
Log.d(TAG, "Received data: " + result);
}
```
以上就是一个简单的使用 UUID 接收数据的示例。你可以根据自己的需求修改 UUID 并实现相应的回调函数。
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