当用户更改应用程序或活动/片段时，继续跟踪服务中的位置

Question

我正在制作健身应用，并且需要在后台跟踪位置（使用Google Play服务）-我运行的是未绑定服务。 从片段开始运行时，该服务运行良好，但是当用户更改片段或更改/最小化应用程序（例如开始使用gmail应用程序等）时，该服务将停止。 我如何保持跟踪位置，以便在最小化应用程序然后再次打开它时仍将对其进行跟踪（以便它可以连续写入SQLite DB-行进距离，平均速度等）

片段中的代码段：

public void onResume(){
//setting up Broadcast Reciever
        if(broadcastReceiver == null){
            broadcastReceiver = new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    Location currentLocation;
                    //retrieving extras with given tag from service
                    currentLocation = (Location) intent.getExtras().get("currentLocation");

                    //displaying speed and altitude if user has selected to view it from the spinner
                    if(appPreferences.getKeyStatsSpinner1().equalsIgnoreCase("CURRENT SPEED")){
                        spinner1TextView.setText(String.valueOf(currentLocation.getSpeed()));
                    }
                    if(appPreferences.getKeyStatsSpinner2().equalsIgnoreCase("CURRENT SPEED")){
                        spinner2TextView.setText(String.valueOf(currentLocation.getSpeed()));
                    }
                    if(appPreferences.getKeyStatsSpinner1().equalsIgnoreCase("CURRENT ALTITUDE")){
                        spinner1TextView.setText(String.valueOf(currentLocation.getAltitude()));
                    }
                    if(appPreferences.getKeyStatsSpinner2().equalsIgnoreCase("CURRENT ALTITUDE")){
                        spinner2TextView.setText(String.valueOf(currentLocation.getAltitude()));
                    }
                }
            };
        }

        //start recieving updates from service with tag given
        //getActivity().registerReceiver(broadcastReceiver, new IntentFilter("LocationTrackingService_update"));
        context.registerReceiver(broadcastReceiver, new IntentFilter("LocationTrackingService_update"));
}
 @Override
public void onPause() {
    super.onPause();

    Log.d(TAG, "onPause: service cancelled");

    //close connecting with broadcast receiver
    if(broadcastReceiver != null){
        //getActivity().unregisterReceiver(broadcastReceiver);
        context.unregisterReceiver(broadcastReceiver);
    }

    trackLocation(false);
}

private void trackLocation(Boolean trackLocation){
        if(trackLocation == true) {
            Intent locationTrackingService = new Intent(context, LocationTrackingService.class);
            //getActivity().startService(locationTrackingService);
            context.startService(locationTrackingService);
        }
        else{
            Intent locationTrackingService = new Intent(context, LocationTrackingService.class);
            //getActivity().stopService(locationTrackingService);
            context.stopService(locationTrackingService);
        }
    }

服务中的代码段：

//automatically called when we .connect() to googleApiClient
    @Override
    public void onConnected(@Nullable Bundle bundle) {

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            ............................
            return;
        }


        //sets location to last known location
        currentLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);

        //broadcasting intent with last known location
        Intent publishLocationUpdate = new Intent("LocationTrackingService_update");
        publishLocationUpdate.putExtra("currentLocation", currentLocation);
        sendBroadcast(publishLocationUpdate);

        //request updates
        LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
    }

我已经读过也许我应该使用“ startForegroundService”代替。 我还想，如果我从onPause中删除服务销毁，该服务将无限期运行-但是当我从onPause中删除代码时，该服务将继续正常运行。

Answer 1

没错，您应该使用ForegroundService。 以下示例运行完美。 我们正在项目中使用它。

Android Play位置前景服务示例