我写下以下代码来获取当前位置。虽然我在不同纬度和经度的模拟器中测试它。但它无法在真实位置转换纬度和经度。
public class LocationFindingActivity extends Activity {
/** Called when the activity is first created. */
EditText et;
LocationManager locationManager;
String provider;
LocationListener locationListener;
Location currentLocation;
String addressString="";
String longlattString="";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
et=(EditText)findViewById(R.id.locationTXT);
locationManager =(LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
provider = locationManager.getBestProvider(criteria, true);
currentLocation=locationManager.getLastKnownLocation(provider);
et.setText(addressString);
locationListener =new LocationListener() {
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location arg0) {
// TODO Auto-generated method stub
updateWithNewLocation(currentLocation);
}
};
updateWithNewLocation(currentLocation);
locationManager.requestLocationUpdates(provider, 2000, 10,locationListener)
}
private void updateWithNewLocation(Location location) {
if (location != null)
{
double lat = location.getLatitude();
double lng = location.getLongitude();
longlattstring="Lattitude :"+lat+"Longitude :"+lng;
Geocoder gc = new Geocoder(this, Locale.getDefault());
try
{
List<Address> addresses = gc.getFromLocation(lat, lng, 1);
StringBuilder sb = new StringBuilder();
//Toast.makeText(this, "Problem1", 2000).show();
if (addresses.size() > 0)
{
Address address = addresses.get(0);
for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
sb.append(address.getAddressLine(i)).append("\n");
sb.append(address.getLocality()).append("\n");
Toast.makeText(this, "Problem2", 2000).show();
sb.append(address.getPostalCode()).append("\n");
sb.append(address.getCountryName());
}
addressString = sb.toString();
}
catch (IOException e)
{
Toast.makeText(this, "Problem Catch", 2000).show();
}
}
else
{
addressString = "No location found";
}
et.setText(addressString);
}
}
我在这一行遇到问题
列表地址= gc.getFromLocation（lat，lng，1）;
声明不会返回任何内容。