android 根据经纬度定位所在城市

package com.studio.android.chp08.ex01;

import java.io.IOException;

import java.util.List;

import android.app.Activity;

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.widget.TextView;

public class CurrentLocation extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

LocationManager locationManager;

String serviceName = Context.LOCATION_SERVICE;

locationManager = (LocationManager)getSystemService(serviceName);

// String provider = LocationManager.GPS_PROVIDER;

String provider = LocationManager.NETWORK_PROVIDER;

Criteria criteria = new Criteria();

criteria.setAccuracy(Criteria.ACCURACY_FINE);

criteria.setAltitudeRequired(false);

criteria.setBearingRequired(false);

criteria.setCostAllowed(true);

criteria.setPowerRequirement(Criteria.POWER_LOW);

// String provider = locationManager.getBestProvider(criteria, true);

Location location = locationManager.getLastKnownLocation(provider);

updateWithNewLocation(location);

locationManager.requestLocationUpdates(provider, 2000, 10,

locationListener);

}

private final LocationListener locationListener = new LocationListener() {

public void onLocationChanged(Location location) {

updateWithNewLocation(location);

}

public void onProviderDisabled(String provider){

updateWithNewLocation(null);

}

public void onProviderEnabled(String provider){ }

public void onStatusChanged(String provider, int status,

Bundle extras){ }

};

private void updateWithNewLocation(Location location) {

String latLongString;

TextView myLocationText;

myLocationText = (TextView)findViewById(R.id.myLocationText);

if (location != null) {

double lat = location.getLatitude();

double lng = location.getLongitude();

latLongString = "纬度:" + lat + "\n经度:" + lng;

} else {

latLongString = "无法获取地理信息";

}

List

addList = null;

Geocoder ge = new Geocoder(this);

try {

addList = ge.getFromLocation(24.463, 118.1, 1);

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

if(addList!=null && addList.size()>0){

for(int i=0; i

Address ad = addList.get(i);

latLongString += "\n";

latLongString += ad.getCountryName() + ";" + ad.getLocality();

}

}

myLocationText.setText("您当前的位置是:\n" +latLongString);

}

}

1 楼

aizhimin

2011-08-26

位置不准啊？怎么回事？我在上海 ，定位出来的却是厦门。

2 楼

aizhimin

2011-08-26

aizhimin 写道

位置不准啊？怎么回事？我在上海 ，定位出来的却是厦门。

是我看错了，你是自己写死了经纬度。但是如果我把location中的值传入进去的时候为什么List

返回为空。后来发现是经纬度位数太长，四舍五入才可以。 addList = ge.getFromLocation(24.463, 118.1, 1);  这里对经纬度的位数要求是精确到多少位啊？