解决百度定位获取position为空的困惑

package com.sfdj.salebaby.utils;

import java.io.IOException;
import java.util.List;
import java.util.Locale;

import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.util.Log;
import android.os.Bundle;  

public class LocationTools {
	private Location location;

	public static LocationManager getLocationManager(Context context) {
		return (LocationManager) context
				.getSystemService(context.LOCATION_SERVICE);
	}

	// 获取位置信息
	public String getAddress(Context context) {
		LocationManager locationManager = this.getLocationManager(context);
		if (!locationManager
				.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
			// 打开GPS 需Android2.2以上系统支持
			android.provider.Settings.Secure.setLocationProviderEnabled(
					context.getContentResolver(), LocationManager.GPS_PROVIDER,
					false);
		}
		return doWork(context);
	}

	private String doWork(Context context) {
		String addres = "";
		LocationManager locationManager = this.getLocationManager(context);
		Criteria criteria = new Criteria();
		// 获得最好的定位效果
		criteria.setAccuracy(Criteria.ACCURACY_FINE);
		criteria.setAltitudeRequired(false);
		criteria.setBearingRequired(false);
		criteria.setCostAllowed(false);
		// 使用省电模式
		criteria.setPowerRequirement(Criteria.POWER_LOW);
		String provider = locationManager.getBestProvider(criteria, true);
		Log.i("provider>>>>>>", provider);
		// 获得当前位置 location为空是一直取 从onLocationChanged里面取
		while (location == null) {
			location = locationManager.getLastKnownLocation(provider);
		}
		// locationListener
		LocationListener locationListener = new LocationListener() {

			@Override
			public void onLocationChanged(Location location) {
				LocationTools.this.location = location;
			}

			@Override
			public void onProviderDisabled(String provider) {

			}

			@Override
			public void onProviderEnabled(String provider) {

			}

			@Override
			public void onStatusChanged(String provider, int status,
					Bundle extras) {

			}

		};
		locationManager.requestLocationUpdates(provider, 1000, 10,
				locationListener);

		Geocoder geo = new Geocoder(context, Locale.getDefault());
		try {
			List<Address> address = geo.getFromLocation(location.getLatitude(),
					location.getLongitude(), 1);
			if (address.size() > 0) {
				addres = address.get(0).getAddressLine(0);
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return addres;
	}
}