关于Android用户定位获取location值为null的解决方法

坑爹的考试终于结束了 目前放假在家  一个字冷啊   不想敲代码了   不过在玩一个GPS的东西 获取Location一直为null  后来是从onLocationChanged里面拿location才搞定了   贴一下吧  代码太乱 不改了  手冷。。。。

/**
 * 主要是用户定位操作
 *@author jeedroid
 */
package com.jeedroid.tools;

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.os.Bundle;
import android.provider.Settings;
import android.util.Log;

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;
}
}

评论

1 楼 335062868 2012-03-29