如何在选项卡之间保持本地服务的运行?

我目前正在开发计步器应用程序。起初,我从一项活动开始,即计步器活动。此活动启动了本应在后台运行的服务,并绑定到该服务。代码很长,所以我只给出我认为对我的问题有帮助的部分。

//Bind service
    private ServiceConnection mServiceConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {

            //binder to communicate with the service
            PedometerService.PedometerBinder mBinder = (PedometerService.PedometerBinder)service;

            mPedometerService = mBinder.getService();
            mPedometerService.registerCallback(mCallback);
        }

        public void onServiceDisconnected(ComponentName className) {
            mPedometerService = null;
        }
    };

private void startPedometerService() {
        if (!isPedometerService) {
            Log.v(TAG, "Start service");
            isPedometerService = true;

            //start service
            Intent intent = new Intent(getApplicationContext(),
                    PedometerService.class);
            startService(intent);
        }
    }

    //Bind to the service
    private void bindPedometerService() {
        Log.i(TAG, "Bind service");

        Intent intent = new Intent(PedometerActivity.this, PedometerService.class);
        bindService(intent, mServiceConnection,
                Context.BIND_AUTO_CREATE + Context.BIND_DEBUG_UNBIND);
    }

    //close connection with service
    private void unbindPedometerService() {
        Log.i(TAG, "Unbind service");
        unbindService(mServiceConnection);
    }

    //Stop the service that had been started
    private void stopPedometerService() {
        Log.i(TAG, "Stop service");
        if (mPedometerService != null) {

            //stop service
            Intent intent = new Intent(PedometerActivity.this, PedometerService.class);
            stopService(intent);

            isPedometerService = false;
        }
    }

@Override
    public void onResume() {
        Log.i(TAG, "onResume");
        super.onResume();

        startPedometerService();
        bindPedometerService();


    }


    @Override
    public void onStop() {
        super.onStop();
        Log.i(TAG, "onStop");
        stopPedometerService();

    }

    public void onDestroy() {
        super.onDestroy();

        unbindPedometerService();
        stopPedometerService();        

    }

在扩展服务的服务类中

 /*Local service binding*/
    public class PedometerBinder extends Binder {
        public PedometerService getService() {
            return PedometerService.this;
        }
    }


    /*A client is binding to the service with bindService()
    * Returns the IBinder object received in
     * ServiceConnection.onServiceConnected(ComponentName,IBinder)*/
    @Override
    public IBinder onBind(Intent intent) {
        return new PedometerBinder();
    }

然后,我修改了我的应用程序,使其具有3个选项卡,即3个片段的tablayout。我将PedmeterActivity中的代码粘贴到PedmeterFragment中,并对其进行了修改

//Bind service
    private ServiceConnection mServiceConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {

            //binder to communicate with the service
            PedometerService.PedometerBinder mBinder = (PedometerService.PedometerBinder)service;

            mPedometerService = mBinder.getService();
            mPedometerService.registerCallback(mCallback);
        }

        public void onServiceDisconnected(ComponentName className) {
            mPedometerService = null;
        }
    };

private void startPedometerService() {
        if (!isPedometerService) {
            Log.v(TAG, "Start service");
            isPedometerService = true;

            //start service
            Intent intent = new Intent(getActivity().getApplicationContext(),
                    PedometerService.class);
            getActivity().startService(intent);
        }
    }

    //Bind to the service
    private void bindPedometerService() {
        Log.i(TAG, "Bind service");

        Intent intent = new Intent(getActivity(), PedometerService.class);
        getActivity().bindService(intent, mServiceConnection,
                Context.BIND_AUTO_CREATE + Context.BIND_DEBUG_UNBIND);
    }

    //close connection with service
    private void unbindPedometerService() {
        Log.i(TAG, "Unbind service");
        getActivity().unbindService(mServiceConnection);
    }

    //Stop the service that had been started
    private void stopPedometerService() {
        Log.i(TAG, "Stop service");
        if (mPedometerService != null) {

            //stop service
            Intent intent = new Intent(getActivity(), PedometerService.class);
            getActivity().stopService(intent);

            isPedometerService = false;
        }
    }

@Override
    public void onResume() {
        Log.i(TAG, "onResume");
        super.onResume();

        startPedometerService();
        bindPedometerService();


    }


    @Override
    public void onStop() {
        super.onStop();
        Log.i(TAG, "onStop");
        stopPedometerService();

    }

    public void onDestroy() {
        super.onDestroy();

        unbindPedometerService();
        stopPedometerService();        

    }

问题是当我在选项卡之间切换时,无法保持服务运行。我正在使用 碎片状态页雷达 因此,当我导航到最后一个选项卡时,第一个片段(计步器片段)被卸载。我已经能够在中保存其他变量 onSaveInstanceState 但这似乎没有帮助,因为一切都重新开始。