要提供“安全蓝牙服务”的代码示例，首先需要了解您对安全蓝牙服务的具体需求。安全蓝牙服务通常用于保护蓝牙通信的安全性，如加密数据、认证设备等。下面是一个基本的安全蓝牙服务示例：

import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattServer;
import android.bluetooth.BluetoothGattServerCallback;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import java.util.UUID;

public class MyBluetoothService {
    private static final String SERVICE_UUID = "00001800-0000-1000-8000-00805f9b34fb"; // 服务UUID
    private static final String CHARACTERISTIC_UUID = "00002a00-0000-1000-8000-00805f9b34fb"; // 特征UUID

    private BluetoothGattServer mGattServer;

    public MyBluetoothService(Context context) {
        BluetoothManager bluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
        if (bluetoothManager != null) {
            mGattServer = bluetoothManager.openGattServer(context, mGattServerCallback);
        }
    }

    public void startAdvertising() {
        // TODO: 开始广播和可连接性模式
    }

    public void stopAdvertising() {
        // TODO: 停止广播和可连接性模式
    }

    private BluetoothGattServerCallback mGattServerCallback = new BluetoothGattServerCallback() {
        @Override
        public void onConnectionStateChange(BluetoothDevice device, int status, int newState) {
            super.onConnectionStateChange(device, status, newState);

            if (newState == BluetoothProfile.STATE_CONNECTED) {
                // 连接建立，进行认证等安全操作
            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                // 连接断开
            }
        }

        @Override
        public void onCharacteristicReadRequest(BluetoothDevice device, int requestId, int offset, BluetoothGattCharacteristic characteristic) {
            super.onCharacteristicReadRequest(device, requestId, offset, characteristic);

            if (characteristic.getUuid().equals(UUID.fromString(CHARACTERISTIC_UUID))) {
                // 处理读取请求
                mGattServer.sendResponse(device, requestId, BluetoothGattServer.GATT_SUCCESS, offset, characteristic.getValue());
            } else {
                // 处理其他特征
                mGattServer.sendResponse(device, requestId, BluetoothGattServer.GATT_FAILURE, offset, null);
            }
        }

        @Override
        public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {
            super.onCharacteristicWriteRequest(device, requestId, characteristic, preparedWrite, responseNeeded, offset, value);

            if (characteristic.getUuid().equals(UUID.fromString(CHARACTERISTIC_UUID))) {
                // 处理写入请求
                mGattServer.sendResponse(device, requestId, BluetoothGattServer.GATT_SUCCESS, offset, value);
            } else {
                // 处理其他特征
                mGattServer.sendResponse(device, requestId, BluetoothGattServer.GATT_FAILURE, offset, null);
            }
        }
    };
}

这是一个简单的安全蓝牙服务示例，包括创建GattServer、处理连接状态变化、读取请求和写入请求等。在实际使用中，您可能需要根据特定的需求进行更多的安全处理，如加密数据传输、认证设备等。请根据您的具体需求进行相应的修改和扩展。