1.首先，在AndroidManifest.xml中注册一个接收器，以便在设备处于空闲状态时启动服务。

2.创建一个service类BluetoothService，在其中启动定时器和BluetoothAdapter。定时器将每15分钟启动一次service。

public class BluetoothService extends Service { private Timer timer; private BluetoothAdapter bluetoothAdapter;

@Override
public void onCreate() {
    super.onCreate();
    timer = new Timer();
    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

    timer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            // Start bluetooth scan and other operations
        }
    }, 0, 900000); // 15 minutes
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return Service.START_NOT_STICKY;
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onDestroy() {
    super.onDestroy();
    timer.cancel();
    timer = null;
}

}

3.在BluetoothReceiver类中处理接收器事件。在蓝牙被关闭或设备被锁屏时，停止服务。

public class BluetoothReceiver extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { final String action = intent.getAction(); if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) { final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR); if (state == BluetoothAdapter.STATE_OFF) { stopBluetoothService(context); } else if (state == BluetoothAdapter.STATE_ON) { startBluetoothService(context); } } else if (action.equals(Intent.ACTION_SCREEN_OFF)) { stopBluetoothService(context); } else if (action.equals(Intent.ACTION_SCREEN_ON)) { startBluetoothService(context); } }

private void startBluetoothService(Context context) {
    Intent intent = new Intent(context, BluetoothService.class);
    context.startService(intent);
}

private void stopBluetoothService(Context context) {
    Intent intent = new Intent(context, BluetoothService.class);
    context.stopService(intent);
}

}