Question

当我有经度和纬度坐标时，我想使用谷歌天气api获取天气信息。所以我采取的代码：

private void updateWeather(){
    new Thread(){
        public void run() {
            //get Weather start:
              LocationHelper helper = new LocationHelper(MomentsActivity.this);
              Location location = helper.getLocation();

              if(null != location){
                  String request = "http://www.google.com/ig/api?weather=,,,"+location.getLatitude()
                          +","+location.getLongitude();
                  XmlParserUtil parser = new XmlParserUtil(mHandler);
                  try {
                      parser.parse(HttpUtil.getWeather(request));
                  } catch (ClientProtocolException e) {
                      e.printStackTrace();
                  } catch (IOException e) {
                      e.printStackTrace();
                  } catch (Exception e) {
                      e.printStackTrace();
                  }
              }
            //end
        };
    }.start();
}

但是当我想从LocationManager获得经度和纬度时，我发现该位置始终为空。请参阅获取位置的代码：

import android.content.Context;
import android.location.Location;
import android.location.LocationManager;

public class LocationHelper {
    Context context;
    public LocationHelper(){}
    public LocationHelper(Context context){
        this.context = context;
    }
    public Location getLocation(){
        LocationManager manager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        if(null == location){
            location = manager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
        }
        return location;
    }
}

请帮我找到错误。谢谢。

另外：我添加了一些权限：

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

同样，我打开了GPS和wifi，但位置也是空的。

Answer 1

     LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {
                // Called when a new location is found by the network location provider.
                System.out.println("Location is: :" + location.toString());

            }

            public void onStatusChanged(String provider, int status, Bundle extras) {}

            public void onProviderEnabled(String provider) {}

            public void onProviderDisabled(String provider) {}
        };

        // Register the listener with the Location Manager to receive location updates
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
//      locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
        locationManager.requestLocationUpdates(LocationManager.PASSIVE_PROVIDER, 0, 0, locationListener);

你可以得到比这更好的东西。例如，连续运行位置代码应该是一个很大的电池消耗。您还需要收听多个响应并过滤以确定准确性和近期性之间的优先级。祝你好运。

获取API for Android的天气信息

1 个答案: