首先需要确保设备上已启用BLE功能。然后，在需要连接Socket时，使用BLE作为通信协议建立连接。具体实现方法如下：

1. 初始化BLE对象：

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothLeScanner mBluetoothScanner = mBluetoothAdapter.getBluetoothLeScanner();

2. 启动BLE扫描，查找需要连接的设备：

ScanFilter filter = new ScanFilter.Builder()
       .setServiceUuid(new ParcelUuid(SERVICE_UUID))
       .build();
        
ScanSettings settings = new ScanSettings.Builder()
       .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
       .build();
        
ScanCallback mScanCallback = new ScanCallback() {
       @Override
       public void onScanResult(int callbackType, ScanResult result) {
           connectToDevice(result.getDevice());
       }
};
        
mBluetoothScanner.startScan(Collections.singletonList(filter), settings, mScanCallback);

3. 连接到设备：

private void connectToDevice(BluetoothDevice device) {
    BluetoothGatt mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
}

4. 设置Socket到远程服务端口:

Socket mSocket = new Socket();
mSocket.connect(new InetSocketAddress("192.168.0.2", 1234), CONNECT_TIMEOUT_MS);

5. 通过BLE与Socket建立通信:

private BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
       @Override
       public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
           if (newState == BluetoothProfile.STATE_CONNECTED) {
               BluetoothGattService service = gatt.getService(SERVICE_UUID);
               mBluetoothGatt.setCharacteristicNotification(service.getCharacteristic(CHARACTERISTIC_UUID), true);
               BluetoothDevice device = gatt.getDevice();
               mSocket.getOutputStream().write("Socket connected from BLE device: " + device.getName());
           }
       }
};