android GPS 获取城市信息

1、取得用户当前位置的经度，纬度。

2、根据经纬度转换成城市名称。

取得用户当前位置的经度，纬度

今天弄了一个多小时，写了一个GPS获取地理位置代码的小例子，包括参考了网上的一些代码，并且对代码进行了一些修改，希望对大家的帮助。具体代码如下： 要实用Adnroid平台的GPS设备，首先需要添加上权限，所以需要添加如下权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

具体实现代码如下：

首先判断GPS模块是否存在或者是开启：

private void openGPSSettings() {
LocationManager alm = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
if (alm
.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
Toast.makeText(this, "GPS模块正常", Toast.LENGTH_SHORT)
.show();
return;
}

Toast.makeText(this, "请开启GPS！", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
startActivityForResult(intent,0); //此为设置完成后返回到获取界面

}

如果开启正常，则会直接进入到显示页面，如果开启不正常，则会进行到GPS设置页面：

获取代码如下：

private void getLocation()
{
// 获取位置管理服务
LocationManager locationManager;
String serviceName = Context.LOCATION_SERVICE;
locationManager = (LocationManager) this.getSystemService(serviceName);
// 查找到服务信息
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE); // 高精度
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW); // 低功耗

String provider = locationManager.getBestProvider(criteria, true); // 获取GPS信息
Location location = locationManager.getLastKnownLocation(provider); // 通过GPS获取位置
updateToNewLocation(location);
// 设置监听器，自动更新的最小时间为间隔N秒(1秒为1*1000，这样写主要为了方便)或最小位移变化超过N米
locationManager.requestLocationUpdates(provider, 100 * 1000, 500,
locationListener);    }

到这里就可以获取到地理位置信息了，但是还是要显示出来，那么就用下面的方法进行显示：

private void updateToNewLocation(Location location) {

TextView tv1;
tv1 = (TextView) this.findViewById(R.id.tv1);
if (location != null) {
double  latitude = location.getLatitude();
double longitude= location.getLongitude();
tv1.setText("维度：" +  latitude+ "\n经度" + longitude);
} else {
tv1.setText("无法获取地理信息");
}

}

这样子就能获取到当前使用者所在的地理位置了，至少如何下地图上实现，在下面将进行获取，并显示出来！对参考代码的人表示感谢！

根据经纬度转换成城市名称

经纬度转换成城市名称，只能使用地图服务了。自己做不来。

地图服务API有两个，一个是百度地图，一个是谷歌地图。百度地图API调用需要注册百度帐号，并申请APP_KEY，谷歌地图API直接调用即可。

百度地图API调用地址：http://api.map.baidu.com/geocoder?output=json&location=纬度,经度&key=APP_KEY

谷歌地图服务API调用地址：http://maps.google.com/maps/api/geocode/json?latlng= 纬度,经度 &language=zh-CN&sensor=true

可以设置返回数据格式，JSON或者XML。

百度返回的JSON数据如下：

{
"status":"OK",
"result":{
"location":{
"lng":112.091446,
"lat":34.123231
},
"formatted_address":"河南省洛阳市嵩县洛栾线",
"business":"",
"addressComponent":{
"city":"洛阳市",
"district":"嵩县",
"province":"河南省",
"street":"洛栾线",
"street_number":""
},
"cityCode":153
}
}

Google返回的JSON数据如下：

{
"results" : [
{
"address_components" : [
{
"long_name" : "石磊街",
"short_name" : "石磊街",
"types" : [ "route" ]
},
{
"long_name" : "嵩县",
"short_name" : "嵩县",
"types" : [ "sublocality", "political" ]
},
{
"long_name" : "洛阳",
"short_name" : "洛阳",
"types" : [ "locality", "political" ]
},
{
"long_name" : "河南省",
"short_name" : "河南省",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
},
{
"long_name" : "471400",
"short_name" : "471400",
"types" : [ "postal_code" ]
}
],
"formatted_address" : "中国河南省洛阳市嵩县石磊街 邮政编码: 471400",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 34.12707180,
"lng" : 112.08963580
},
"southwest" : {
"lat" : 34.12574650,
"lng" : 112.08785710
}
},
"location" : {
"lat" : 34.12640920,
"lng" : 112.08874650
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 34.12775813029150,
"lng" : 112.0900954302915
},
"southwest" : {
"lat" : 34.12506016970850,
"lng" : 112.0873974697085
}
}
},
"types" : [ "route" ]
},
{
"address_components" : [
{
"long_name" : "471400",
"short_name" : "471400",
"types" : [ "postal_code" ]
},
{
"long_name" : "嵩县",
"short_name" : "嵩县",
"types" : [ "sublocality", "political" ]
},
{
"long_name" : "洛阳",
"short_name" : "洛阳",
"types" : [ "locality", "political" ]
},
{
"long_name" : "河南省",
"short_name" : "河南省",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "中国河南省洛阳市嵩县 邮政编码: 471400",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 34.15635430,
"lng" : 112.47980870
},
"southwest" : {
"lat" : 34.11958570,
"lng" : 112.08340650
}
},
"location" : {
"lat" : 34.13457310,
"lng" : 112.08557980
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 34.13770670,
"lng" : 112.09532960
},
"southwest" : {
"lat" : 34.11958570,
"lng" : 112.08340650
}
}
},
"types" : [ "postal_code" ]
},
{
"address_components" : [
{
"long_name" : "嵩县",
"short_name" : "嵩县",
"types" : [ "sublocality", "political" ]
},
{
"long_name" : "洛阳",
"short_name" : "洛阳",
"types" : [ "locality", "political" ]
},
{
"long_name" : "河南省",
"short_name" : "河南省",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "中国河南省洛阳市嵩县",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 34.34610090,
"lng" : 112.37709810
},
"southwest" : {
"lat" : 33.57053370,
"lng" : 111.7026910
}
},
"location" : {
"lat" : 34.1345170,
"lng" : 112.0856350
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 34.34610090,
"lng" : 112.37709810
},
"southwest" : {
"lat" : 33.57053370,
"lng" : 111.7026910
}
}
},
"types" : [ "sublocality", "political" ]
},
{
"address_components" : [
{
"long_name" : "洛阳",
"short_name" : "洛阳",
"types" : [ "locality", "political" ]
},
{
"long_name" : "河南省",
"short_name" : "河南省",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "中国河南省洛阳市",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 35.07023590,
"lng" : 112.98473820
},
"southwest" : {
"lat" : 33.57053370,
"lng" : 111.13844390
}
},
"location" : {
"lat" : 34.6184520,
"lng" : 112.454290
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 34.83072270,
"lng" : 112.66242380
},
"southwest" : {
"lat" : 34.48078050,
"lng" : 112.23389270
}
}
},
"types" : [ "locality", "political" ]
},
{
"address_components" : [
{
"long_name" : "河南省",
"short_name" : "河南省",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "中国河南省",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 36.36656020,
"lng" : 116.65223210
},
"southwest" : {
"lat" : 31.38237110,
"lng" : 110.3604760
}
},
"location" : {
"lat" : 34.768190,
"lng" : 113.6872280
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 36.36656020,
"lng" : 116.65223210
},
"southwest" : {
"lat" : 31.38237110,
"lng" : 110.3604760
}
}
},
"types" : [ "administrative_area_level_1", "political" ]
},
{
"address_components" : [
{
"long_name" : "中国",
"short_name" : "CN",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "中国",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 53.56097399999999,
"lng" : 134.77280990
},
"southwest" : {
"lat" : 18.15352160,
"lng" : 73.49941360
}
},
"location" : {
"lat" : 35.861660,
"lng" : 104.1953970
},
"location_type" : "APPROXIMATE",
"viewport" : {
"northeast" : {
"lat" : 53.56097399999999,
"lng" : 134.77280990
},
"southwest" : {
"lat" : 18.15352160,
"lng" : 73.49941360
}
}
},
"types" : [ "country", "political" ]
}
],
"status" : "OK"
}