當用戶更改應用程序或活動/片段時，繼續跟蹤服務中的位置

Question

我正在制作健身應用，並且需要在后台跟蹤位置（使用Google Play服務）-我運行的是未綁定服務。 從片段開始運行時，該服務運行良好，但是當用戶更改片段或更改/最小化應用程序（例如開始使用gmail應用程序等）時，該服務將停止。 我如何保持跟蹤位置，以便在最小化應用程序然后再次打開它時仍將對其進行跟蹤（以便它可以連續寫入SQLite DB-行進距離，平均速度等）

片段中的代碼段：

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);
        }
    }

服務中的代碼段：

//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);
    }

我已經讀過也許我應該使用“ startForegroundService”代替。 我還想，如果我從onPause中刪除服務銷毀，該服務將無限期運行-但是當我從onPause中刪除代碼時，該服務將繼續正常運行。

Answer 1

沒錯，您應該使用ForegroundService。 以下示例運行完美。 我們正在項目中使用它。

Android Play位置前景服務示例