在BroadcastReceiver中未定义getPreferences(MODE_PRIVATE)

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent serviceIntent = new Intent(context, MyService.class);
        context.startService(serviceIntent);
    }
}

public class MyService extends Service {
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        SharedPreferences sharedPreferences = getSharedPreferences("MyPreferences", MODE_PRIVATE);
        // 访问本地数据存储
        return START_STICKY;
    }

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