Android studio低功耗蓝牙代码

以下是一个简单的 Android Studio 低功耗蓝牙代码示例，用于连接和发送数据：

1. 首先，确保您的设备支持低功耗蓝牙，并在项目中添加以下权限：

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

2. 在您的活动中，声明以下变量：

private BluetoothAdapter bluetoothAdapter;
private BluetoothGatt bluetoothGatt;
private BluetoothGattCharacteristic characteristic;
private boolean connected = false;

3. 初始化蓝牙适配器：

bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

4. 扫描和连接到设备：

private void connectToDevice(String deviceAddress) {
    BluetoothDevice device = bluetoothAdapter.getRemoteDevice(deviceAddress);
    bluetoothGatt = device.connectGatt(this, false, gattCallback);
}

private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            connected = true;
            bluetoothGatt.discoverServices();
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            connected = false;
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            characteristic = gatt.getService(serviceUUID)
                    .getCharacteristic(characteristicUUID);
        }
    }
};

5. 发送数据：

private void sendData(String data) {
    if (connected && characteristic != null) {
        byte[] bytes = data.getBytes(Charset.forName("UTF-8"));
        characteristic.setValue(bytes);
        bluetoothGatt.writeCharacteristic(characteristic);
    }
}

请注意，上面的代码仅供参考，并且需要根据您的设备和需求进行修改。