How To Start Service Again When App Restarts And User Already Granted Location Access

I am able to implement a simple gpsTracker using a service that runs on background like this: public class MyService extends Service { private static final String TAG = 'BOOMBO

Solution 1:

Well You have to start the service in two cases:-

1) When user grant the location access.

2)When user already granted the permission after launching application again.

So you have to handle both the ways

Try this.

public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;

public boolean checkLocationPermission() {
    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission. ACCESS_FINE_LOCATION)
            != PackageManager.PERMISSION_GRANTED) {

        // Should we show an explanation?
        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission. ACCESS_FINE_LOCATION)) {

            // Show an explanation to the user *asynchronously* -- don't block
            // this thread waiting for the user's response! After the user
            // sees the explanation, try again to request the permission.
            new AlertDialog.Builder(this)
                    .setTitle(R.string.title_location_permission)
                    .setMessage(R.string.text_location_permission)
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            //Prompt the user once explanation has been shown
                            ActivityCompat.requestPermissions(MainActivity.this,
                                    new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
                                    MY_PERMISSIONS_REQUEST_LOCATION);
                        }
                    })
                    .create()
                    .show();


        } else {
            // No explanation needed, we can request the permission.
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission. ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST_LOCATION);
        }
        return false;
    } else {
        return true;
    }
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case MY_PERMISSIONS_REQUEST_LOCATION: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // location-related task you need to do.
                if (ContextCompat.checkSelfPermission(this,
                        Manifest.permission. ACCESS_FINE_LOCATION)
                        == PackageManager.PERMISSION_GRANTED) {


                    //start your service here
                   startService(new Intent(this, MyService.class)); 
                }

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.

            }
            return;
        }

    }
}

The in OnResume() do this

@Override
protected void onResume() {
    super.onResume();

    if (checkLocationPermission()) {
       if (ContextCompat.checkSelfPermission(this,
           Manifest.permission. ACCESS_FINE_LOCATION)
           == PackageManager.PERMISSION_GRANTED) {
                  //start your service here
                       startService(new Intent(this, MyService.class)); 

       }
    }

}

No need to Call this Method in onCreate()

public void initService(View view){
       // no need to initialize permission and service class here
    }