在Fragment中获取位置数据的最佳方法

Question

我有一个检索用户位置的片段，一旦它有了格子并且长了，它就会运行异步任务来更新基于lat和long的列表视图。

我的问题是，我弹出一个对话框，说明在异步任务运行时加载。但在此之前，我没有任何运行通知用户他们的位置被找到。所以有一个尴尬的停顿，除了快速吐司告诉用户我找到他们的位置之外没有其他任何事情发生，我可以在获得位置的同时运行另一个对话框吗？

以下是我在片段中所做的事情：

package com.example.mike.beerportfoliomaterial;

import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTabHost;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

/**
 * Created by Mike on 3/8/14.
 */
public class FindBrewery extends Fragment implements LocationListener, GetNearbyBreweries.OnArticleSelectedListener {

    private TextView latituteField;
    private TextView longitudeField;
    LocationManager locationManager;
    private String provider;


    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        Context c = getActivity().getApplicationContext();
        locationManager =(LocationManager)activity.getSystemService(Context.LOCATION_SERVICE);

    }



    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        //todo change view
        View rootView = inflater.inflate(R.layout.beer_location_list,container, false);
        ((ActionBarActivity)getActivity()).getSupportActionBar().setTitle("Nearby Breweries");

        // Get the location manager
        // Define the criteria how to select the locatioin provider -> use
        // default
        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, false);
        //Location location = locationManager.getLastKnownLocation(provider);

        Location location = null;

        Toast.makeText(getActivity(), "Getting your GPS Location", Toast.LENGTH_LONG).show();


        // Initialize the location fields
        if (location != null) {
            System.out.println("Provider " + provider + " has been selected.");
            onLocationChanged(location);
        } else {

        }


        return rootView;
    }




    /* Request updates at startup */
    @Override
    public void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    /* Remove the locationlistener updates when Activity is paused */
    @Override
    public void onPause() {
        super.onPause();
        locationManager.removeUpdates(this);
    }

    @Override
    public void onLocationChanged(Location location) {
        float lat = (float) (location.getLatitude());
        float lng = (float) (location.getLongitude());
        //latituteField.setText(String.valueOf(lat));
        //longitudeField.setText(String.valueOf(lng));

        //Toast.makeText(this, "Finding your loaction",Toast.LENGTH_SHORT).show();

        //call asycn task for location
        String url = "getDataURL&format=json&lat="+ lat +"&lng=" + lng + "&radius=50";


        Log.d("location" , "lat=" + lat);
        Log.d("location" , "lng=" + lng);

        //async task goes here
        new GetNearbyBreweries(this.getActivity()).execute(url);

        locationManager.removeUpdates(this);

        //todo: get json
        GetNearbyBreweries task = new GetNearbyBreweries(getActivity());
        task.setOnArticleSelectedListener(this);
        task.execute(url);



    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onProviderEnabled(String provider) {
        //Toast.makeText(this, "Enabled new provider " + provider,Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderDisabled(String provider) {
        //Toast.makeText(this, "Disabled provider " + provider,Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onArticleSelected(String b){

        //code to execute on click
        Fragment Fragment_one;
        FragmentManager man= getFragmentManager();
        FragmentTransaction tran = man.beginTransaction();

        Fragment_one = new BreweryPage2();
        final Bundle bundle = new Bundle();
        bundle.putString("breweryIDSent", b);
        Fragment_one.setArguments(bundle);
        tran.replace(R.id.main, Fragment_one);//tran.
        tran.addToBackStack(null);
        tran.commit();

    }



}