android获取不到当前经纬度
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
}
}
