我需要自动获取用户不断变化的位置。在我的代码中，我必须在asynctask中使用requestLocationUpdates方法。但是从不调用onLocationChanged方法。
这是我的代码
private class GetDetails extends AsyncTask<Void, Void, Void>{
public TrackLocationListener trackloc;
public LocationManager locationManager;
@Override
protected void onPreExecute() {
super.onPreExecute();
System.out.println("Pre Execute");
trackloc = new TrackLocationListener();
locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,trackloc);
}
@Override
protected Void doInBackground(Void... arg0) {
ServiceHandler sh = new ServiceHandler();
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);
Log.d("Response: ", "> " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
job = jsonObj.getJSONArray("USERDETAILS");
//**Array of PERSONAL DETAILS**
for (int i = 0; i < job.length(); i++) {
JSONObject c = job.getJSONObject(i);
latitude = c.getString("latitude");
longitude = c.getString("longitude");
System.out.println("LAT 2 "+latitude);
System.out.println("LON 2 "+longitude);
}
Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable(){
@Override
public void run() {
System.out.println("Changr Latitude "+change_latitude);
System.out.println("Changr Longititude "+change_longitude);
final LatLng TutorialsPoint = new LatLng(Double.parseDouble(latitude) , Double.parseDouble(longitude));
try {
if (googleMap == null) {
System.out.println("MAP IN");
googleMap = ((MapFragment) getFragmentManager().
findFragmentById(R.id.map)).getMap();
}
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
googleMap.addMarker(new MarkerOptions().position(TutorialsPoint).title(name));
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
Double.parseDouble(latitude), Double.parseDouble(longitude)), 18.0f));
} catch (Exception e) {
e.printStackTrace();
}
}
// your UI code here
});
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
return null;
}
}
public class TrackLocationListener implements LocationListener{
TrackLocationListener(){
System.out.println("Testing ....");
}
@Override
public void onLocationChanged(Location location) {
System.out.println("Changing....");
int lat = (int) location.getLatitude(); // * 1E6);
int log = (int) location.getLongitude(); // * 1E6);
int acc = (int) (location.getAccuracy());
String info = location.getProvider();
try{
//change_latitude = location.getLatitude();
//change_longitude = location.getLongitude();
}catch (Exception e) {
// progDailog.dismiss();
// Toast.makeText(getApplicationContext(),"Unable to get Location"
// , Toast.LENGTH_LONG).show();
}
}
public void onProviderDisabled(String provider) {
Log.i("OnProviderDisabled", "OnProviderDisabled");
}
public void onProviderEnabled(String provider) {
Log.i("onProviderEnabled", "onProviderEnabled");
}
public void onStatusChanged(String provider, int status,
Bundle extras) {
Log.i("onStatusChanged", "onStatusChanged");
}
}