Android 通过当前经纬度获得城市的实例代码
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2023-11-04 14:36:34
复制代码 代码如下:package com.yy; import java.io.inputstreamreader;import java.net.httpurlconn...
复制代码 代码如下:
package com.yy;
import java.io.inputstreamreader;
import java.net.httpurlconnection;
import java.net.url;
import javax.xml.parsers.saxparser;
import javax.xml.parsers.saxparserfactory;
import org.xml.sax.attributes;
import org.xml.sax.inputsource;
import org.xml.sax.saxexception;
import org.xml.sax.xmlreader;
import org.xml.sax.helpers.defaulthandler;
import android.content.context;
import android.location.location;
import android.location.locationmanager;
public class getcity {
/**
* 借助google map 通过用户当前经纬度 获得用户当前城市
*/
static final string google_maps_api_key = "abcdefg";
private locationmanager locationmanager;
private location currentlocation;
private string city="全国";
public getcity(context context) {
this.locationmanager = (locationmanager) context
.getsystemservice(context.location_service);
//只是简单的获取城市 不需要实时更新 所以这里先注释
// this.locationmanager.requestlocationupdates(
// locationmanager.gps_provider, 1000, 0,
// new locationlistener() {
// public void onlocationchanged(location loc) {
// //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
// // save the latest location
// currentlocation = loc;
// // update the latitude & longitude textviews
// system.out
// .println("getcity()"
// + (loc.getlatitude() + " " + loc
// .getlongitude()));
// }
//
// public void onproviderdisabled(string arg0) {
// system.out.println(".onproviderdisabled(关闭)"+arg0);
// }
//
// public void onproviderenabled(string arg0) {
// system.out.println(".onproviderenabled(开启)"+arg0);
// }
//
// public void onstatuschanged(string arg0, int arg1,
// bundle arg2) {
// system.out.println(".onstatuschanged(provider的转态在可用、" +
// "暂时不可用和无服务三个状态直接切换时触发此函数)"+
// arg0+" "+arg1+" "+arg2);
// }
// });
currentlocation = locationmanager.getlastknownlocation(locationmanager.gps_provider);
if (currentlocation == null)
currentlocation = locationmanager
.getlastknownlocation(locationmanager.network_provider);
}
/**
* 开始解析
*/
public void start() {
if(currentlocation!=null){
new thread(){
public void run(){
string temp=reversegeocode(currentlocation);
if(temp!=null&&temp.length()>=2)
city=temp;
}
}.start();
}else{
system.out.println("getcity.start()未获得location");
}
}
/**
* 获得城市
* @return
*/
public string getcity(){
return city;
}
/**
* 通过google map api 解析出城市
* @param loc
* @return
*/
public string reversegeocode(location loc) {
// http://maps.google.com/maps/geo?q=40.714224,-73.961452&output=json&oe=utf8&sensor=true_or_false&key=your_api_key
string localityname = "";
httpurlconnection connection = null;
url serveraddress = null;
try {
// build the url using the latitude & longitude you want to lookup
// note: i chose xml return format here but you can choose something
// else
serveraddress = new url("http://maps.google.com/maps/geo?q="
+ double.tostring(loc.getlatitude()) + ","
+ double.tostring(loc.getlongitude())
+ "&output=xml&oe=utf8&sensor=true&key="
+ google_maps_api_key);
// set up out communications stuff
connection = null;
// set up the initial connection
connection = (httpurlconnection) serveraddress.openconnection();
connection.setrequestmethod("get");
connection.setdooutput(true);
connection.setreadtimeout(10000);
connection.connect();
try {
inputstreamreader isr = new inputstreamreader(connection
.getinputstream());
inputsource source = new inputsource(isr);
saxparserfactory factory = saxparserfactory.newinstance();
saxparser parser = factory.newsaxparser();
xmlreader xr = parser.getxmlreader();
googlereversegeocodexmlhandler handler = new googlereversegeocodexmlhandler();
xr.setcontenthandler(handler);
xr.parse(source);
localityname = handler.getlocalityname();
system.out.println("getcity.reversegeocode()"+localityname);
} catch (exception ex) {
ex.printstacktrace();
}
} catch (exception ex) {
ex.printstacktrace();
system.out.println("getcity.reversegeocode()"+ex);
}
return localityname;
}
/**
* the final piece of this puzzle is parsing the xml tha
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