Java 在单独的类中从LocationListener获取当前城市的结果

嗨，我已经实现了一个位置侦听器来检索当前的城市名称。我遇到的唯一问题是，我不太确定将结果返回给调用类MainActivity.java的最佳方法是什么

这是我代码的一些摘录：

主要活动

这是我在分离的java文件上的LocationListener类

public class MyLocationListener implements LocationListener {

    private Context mContext;
    private String mLocality;
    private String mCountry;

    public MyLocationListener(Context context){
        mContext = context;
    }

    @Override
    public void onLocationChanged(Location location) {
        //You had this as int. It is advised to have Lat/Loing as double.
        double lat = location.getLatitude();
        double lng = location.getLongitude();

        String countryName = null;
        String subAdmin  = null;
        String adminArea  = null;
        String locality  = null;
        String sublocality  = null;

        String longitude = "Longitude: " + location.getLongitude();
        String latitude = "Latitude: " + location.getLatitude();
        Log.i("DEBUG", longitude);
        Log.i("DEBUG", latitude);

        Geocoder geoCoder = new Geocoder(mContext, Locale.getDefault());
        StringBuilder builder = new StringBuilder();
        try {
            List<Address> address = geoCoder.getFromLocation(lat, lng, 1);
            if(address.size() > 0){
                adminArea = address.get(0).getAdminArea().toString();
                countryName = address.get(0).getCountryName().toString();
                subAdmin = address.get(0).getSubAdminArea();
                locality = address.get(0).getLocality();
                sublocality = address.get(0).getSubLocality();
            }
            Log.i("DEBUG", adminArea);
            Log.i("DEBUG", countryName);
            mLocality = adminArea;
            mCountry = countryName;
        } catch (IOException e) {}
          catch (NullPointerException e) {}
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Log.i("DEBUG", "Disabled provider " + provider);
    }

    @Override
    public void onProviderEnabled(String provider) {
        Log.i("DEBUG", "Enabled new provider " + provider);
    }


    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }
}

我试图实现的是在应用程序启动时以及位置更改时显示城市名称

我应该叫onLocationChange还是别的？

---

谁能给我指一下正确的方向吗？Thx的帮助。

提取onLocationChanged中的所有内容，将其转换为方法或类，并将该方法放入其中。在启动时调用该方法，然后从onLocationChanged

可以让活动实现LocationListener接口。

public class MyLocationListener implements LocationListener {

    private Context mContext;
    private String mLocality;
    private String mCountry;

    public MyLocationListener(Context context){
        mContext = context;
    }

    @Override
    public void onLocationChanged(Location location) {
        //You had this as int. It is advised to have Lat/Loing as double.
        double lat = location.getLatitude();
        double lng = location.getLongitude();

        String countryName = null;
        String subAdmin  = null;
        String adminArea  = null;
        String locality  = null;
        String sublocality  = null;

        String longitude = "Longitude: " + location.getLongitude();
        String latitude = "Latitude: " + location.getLatitude();
        Log.i("DEBUG", longitude);
        Log.i("DEBUG", latitude);

        Geocoder geoCoder = new Geocoder(mContext, Locale.getDefault());
        StringBuilder builder = new StringBuilder();
        try {
            List<Address> address = geoCoder.getFromLocation(lat, lng, 1);
            if(address.size() > 0){
                adminArea = address.get(0).getAdminArea().toString();
                countryName = address.get(0).getCountryName().toString();
                subAdmin = address.get(0).getSubAdminArea();
                locality = address.get(0).getLocality();
                sublocality = address.get(0).getSubLocality();
            }
            Log.i("DEBUG", adminArea);
            Log.i("DEBUG", countryName);
            mLocality = adminArea;
            mCountry = countryName;
        } catch (IOException e) {}
          catch (NullPointerException e) {}
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Log.i("DEBUG", "Disabled provider " + provider);
    }

    @Override
    public void onProviderEnabled(String provider) {
        Log.i("DEBUG", "Enabled new provider " + provider);
    }


    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

    }
}