android 根据经纬度定位所在城市

最新推荐文章于 2024-05-11 09:46:10 发布

转载最新推荐文章于 2024-05-11 09:46:10 发布 · 3.4k 阅读

文章标签：

#android #定位

本文介绍了一个简单的Android应用程序，用于获取用户的当前位置。通过使用LocationManager和LocationListener，该应用能够从网络提供商获取最新的位置信息，并利用Geocoder将经纬度转换为地址。

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转自http://www.thinksaas.cn/group/topic/215488/，更改了他默认写死的经纬度，可以得到正确的定位

requires ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION permission.

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) {
double lat = 0;
double lng = 0;
String latLongString;

TextView myLocationText;

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

if (location != null) {

lat = location.getLatitude();

lng = location.getLongitude();

DecimalFormat df = new  DecimalFormat("#.###");
			
//	lat = df.format(lat);
//	lng = df.format(lng);
//	latLongString = "纬度:" + df.format(lat) + "n经度:" + df.format(lng);
			
	latLongString = "纬度:" + lat + "n经度:" + lng;


	} else {

		latLongString = "无法获取地理信息";

	}


	List<Address> addList = null;
	Geocoder ge = new Geocoder(this);

	try {

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

	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

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

for(int i=0; i<addList.size(); i++){

Address ad = addList.get(i);

latLongString +="n";

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

}

}

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