Android-谷歌地图-获取所在地城市名

最新推荐文章于 2016-01-19 10:21:25 发布

原创最新推荐文章于 2016-01-19 10:21:25 发布 · 606 阅读

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#string #null #url #network #class

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本文介绍了一种通过经纬度获取当前位置城市的实用方法。使用了Geocoder解析经纬度，并通过LocationManager获取位置信息。

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public class LocationUtils {

   //publicstatic String cityName = "深圳"; //城市名
    publicstatic String cityName ; //城市名

    privatestatic Geocodergeocoder;   //此对象能通过经纬度来获取相应的城市等信息


    publicstatic void getCNBylocation(Context context){

       geocoder =new Geocoder(context);
      //用于获取Location对象，以及其他
      LocationManager locationManager;
       StringserviceName = Context.LOCATION_SERVICE;
      //实例化一个LocationManager对象
      locationManager =(LocationManager)context.getSystemService(serviceName);
      //provider的类型
       Stringprovider = LocationManager.NETWORK_PROVIDER;

       Criteriacriteria = new Criteria();
      criteria.setAccuracy(Criteria.ACCURACY_FINE);   //高精度
      criteria.setAltitudeRequired(false);   //不要求海拔
      criteria.setBearingRequired(false);   //不要求方位
      criteria.setCostAllowed(false);   //不允许有话费
      criteria.setPowerRequirement(Criteria.POWER_LOW);   //低功耗

      //通过最后一次的地理位置来获得Location对象
       Locationlocation = locationManager.getLastKnownLocation(provider);

       Stringqueryed_name = updateWithNewLocation(location);
      if((queryed_name != null) && (0 !=queryed_name.length())){

          cityName =queryed_name;
       }


      locationManager.requestLocationUpdates(provider, 30000, 50,
            locationListener);
      //移除监听器，在只有一个widget的时候，这个还是适用的
      locationManager.removeUpdates(locationListener);
    }


    privatefinal static LocationListener locationListener = newLocationListener() {
       StringtempCityName;
       public voidonLocationChanged(Location location) {

          tempCityName= updateWithNewLocation(location);
         if((tempCityName != null) &&(tempCityName.length() != 0)){

             cityName =tempCityName;
          }
       }

       public voidonProviderDisabled(String provider) {
          tempCityName= updateWithNewLocation(null);
          if((tempCityName != null) &&(tempCityName.length() != 0)) {

             cityName =tempCityName;
          }
       }

       public voidonProviderEnabled(String provider) {
       }

       public voidonStatusChanged(String provider, int status, Bundle extras) {
       }
    };


    privatestatic String updateWithNewLocation(Location location) {
       StringmcityName = "";
       double lat =0;
       double lng =0;
      List<Address> addList = null;
       if (location!= null) {
          lat =location.getLatitude();
          lng =location.getLongitude();
       } else{

         System.out.println("无法获取地理信息");
       }

       try {

          addList =geocoder.getFromLocation(lat, lng,1);   //解析经纬度

       } catch(IOException e) {
          // TODOAuto-generated catch block
         e.printStackTrace();
       }
       if (addList!= null && addList.size()> 0) {
          for (int i =0; i < addList.size(); i++) {
             Address add= addList.get(i);
             mcityName +=add.getLocality();
          }
       }
      if(mcityName.length()!=0){

          returnmcityName.substring(0, (mcityName.length()-1));
       } else{
          returnmcityName;
       }
    }


    publicstatic String GetAddr(String latitude, String longitude){
       String addr= "";


       String url =String.format(
         "http://ditu.google.cn/maps/geo?output=csv&key=abcdef&q=%s,%s",
          latitude,longitude);
       URL myURL =null;
      URLConnection httpsConn = null;
       try{

          myURL = newURL(url);
       } catch(MalformedURLException e) {
        e.printStackTrace();
        return null;
      }

       try{

          httpsConn =(URLConnection) myURL.openConnection();

          if(httpsConn != null) {
            InputStreamReader insr = newInputStreamReader(
                  httpsConn.getInputStream(), "UTF-8");
            BufferedReader br = newBufferedReader(insr);
             String data= null;
             if ((data =br.readLine()) != null) {
                String[]retList = data.split(",");
                if(retList.length > 2&& ("200".equals(retList[0]))){
                   addr =retList[2];
                } else{
                   addr ="";
               }
            }
            insr.close();
         }
       } catch(IOException e) {

         e.printStackTrace();
         returnnull;
      }
         returnaddr;
    }

}

加上权限：

<uses-permissionandroid:name="android.permission.INTERNET" />
<uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permissionandroid:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permissionandroid:name="android.permission.ACCESS_FINE_LOCATION"/>