android获取不到当前经纬度

luweiyuan01 2011-09-23 06:00:36



package com.gpdi;

  

import com.autonavi.mapapi.GeoPoint;

import com.autonavi.mapapi.MapActivity;

import com.autonavi.mapapi.MapController;

import com.autonavi.mapapi.MapView;

import com.autonavi.mapapi.MyLocationOverlay; 

 

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.util.Log;



@SuppressWarnings("unused")

public class MapTestActivity  extends MapActivity { 

	

	MapView mMapView; 

	MapController mMapController; 

	GeoPoint point;



	private double latitude=0.0;

	private double longitude =0.0; 

	

	@Override

	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);  

		

		LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

		if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){

			Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

			if(location != null){

				latitude = location.getLatitude();

				longitude = location.getLongitude();

				}

		}else{

			LocationListener locationListener = new LocationListener() {

				

				// Provider的状态在可用、暂时不可用和无服务三个状态直接切换时触发此函数

				@Override

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

					

				}

				

				// Provider被enable时触发此函数，比如GPS被打开

				@Override

				public void onProviderEnabled(String provider) {

					

				} 

				// Provider被disable时触发此函数，比如GPS被关闭 

				@Override

				public void onProviderDisabled(String provider) {

					

				}

				

				//当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发 

				@Override

				public void onLocationChanged(Location location) {

					if (location != null) {   

						Log.e("Map", "Location changed : Lat: " + location.getLatitude() + " Lng: " + location.getLongitude());   

					}

				}

			};

			//locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,1000, 0,locationListener); 

			Criteria crit = new Criteria(); 

			crit.setAccuracy(Criteria.ACCURACY_FINE);

			String provider = locationManager.getBestProvider(crit, true); 

			Location location = locationManager.getLastKnownLocation(provider); 

			//Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);   

			if(location != null){   

				latitude = location.getLatitude(); //经度   

				longitude = location.getLongitude(); //纬度 

			} 

		}

		mMapView = (MapView) findViewById(R.id.atmapsView); 

		mMapView.setBuiltInZoomControls(true); //设置吭用内置的缩放控件 

		mMapController = mMapView.getController(); // 得到mMapView的控制权,可以用它控制和驱动平移和缩放 

		point = new GeoPoint((int) (latitude * 1E6), (int) (longitude * 1E6)); //用给定的经纬度构造一个GeoPoint，单位是微度 (度 * 1E6)

		mMapController.setCenter(point); //设置地图中心点 

		mMapController.setZoom(12); //设置地图zoom级别

	}

}

获取的location全为null
权限已设置：
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"></uses-permission>
<uses-permission android:name="android.permission.RESTART_PACKAGES"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

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