android - 从纬度和经度获取地址

Question

我正在尝试通过这样的经纬度获取用户的地址:

LocationManager locationManager = (LocationManager)  
this.getSystemService(Context.LOCATION_SERVICE);
    // Define a listener that responds to location updates
    final LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            // Called when a new location is found by the network location provider.

            lat =location.getLatitude();
            lon = location.getLongitude();


        }

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

        public void onProviderEnabled(String provider) {}

        public void onProviderDisabled(String provider) {}
    };




    try{
        Geocoder geocoder;

        geocoder = new Geocoder(this, Locale.getDefault());
        addresses=(geocoder.getFromLocation(lat, lon, 1));

    }catch(IOException e){
        e.printStackTrace();
    }

    String address = addresses.get(0).getAddressLine(0);
    String city = addresses.get(0).getAddressLine(1);
    String country = addresses.get(0).getAddressLine(2);


    TextView tv = (TextView) findViewById(R.id.tv3);
    tv.setText(address+"\n"+city+"\n"+country);

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

每次运行此程序时，我都会在“String address = addresses.get(0).getAddressLine(0);”这一行收到错误“IndexOutOfBoundsException:索引 0 无效，大小为 0”。我了解该错误意味着我正在尝试访问不存在的内容，但我不确定是什么原因造成的。我一直在寻找获取地址的最佳方式，这是我找到的，但它可能不是最有效或最好的方式。有什么建议么？

Answer 1

Lat 和 lon 仅在地理编码后触发的 onLocationchanged 中设置为它们各自的值，请尝试在之前设置 lat 和 lon 或将地理编码放在 onLocationChanged 中。我看不到所有代码，但我猜你正在将经纬度初始化为 0，而地理编码器没有 0,0 的地址