android GPS 获取城市信息
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1、取得用户当前位置的经度,纬度。
Google返回的JSON数据如下:
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"
- }
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