How to get user's GPS coordinates by clicking a button?

Question

Hello there i'm having a problem here

i have an add and edit form for my point of views databases it has two EditText for the coordinates, for Longitude and Latitude and it has a button to get the current coordinates if i click the button, the two EditTexts filled with the coordinates and the user can proceed to insert or edit the data

my code returning a java.nullPointerException, i don't know why...

this is my code :

btn_getkoor.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                try{

                    LocationListener gpsLocation = new MyLocationListener();
                    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, gpsLocation); //new MyLocationListener());
                    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                    final TextView error_text = (TextView) findViewById(R.id.error_text);

                    if (location != null) {

                        EditText et_longitude = (EditText) findViewById(R.id.et_longitude);
                        EditText et_latitude = (EditText) findViewById(R.id.et_latitude);

                        et_longitude.setText(""+location.getLongitude());   // longitude textview
                        et_latitude.setText(""+location.getLatitude());     //latitude textview

                        locationManager.removeUpdates((LocationListener) location);
                        locationManager = null;

                    }else{
                        toastkeun("Terjadi Kesalahan dalam pengambilan koordinat");             //toast function
                        error_text.setText("Terjadi Kesalahan dalam pengambilan koordinat");    //textview for showing errors
                    }
                }catch(Exception e){
                    toastkeun(e.toString());
                }

            }
        });

Any solution?

I'm already set the Manifest file FYI

protected LocationManager locationManager; i place it before onCreate() — Falmesino, Jul 04 '11 at 04:22

score 0 · Accepted Answer · answered Jul 04 '11 at 04:24

0

It is difficult to say from your code, though :

If you haven't done this, here is the code :

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

answered Jul 04 '11 at 04:24

Reno

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where i should place that line? – Falmesino Jul 04 '11 at 04:31
ok i get my coordinates now, but it returning java.lang.ClassCastException : android location.Location – Falmesino Jul 04 '11 at 04:33
First you MUST always tell what is the line causing the exception. Second `locationManager.removeUpdates((LocationListener) location)` location cannot be cast into LocationListener. They are different classes! – Reno Jul 04 '11 at 04:36
so how to stop updating the coordinates? – Falmesino Jul 04 '11 at 05:09
Using `removeUpdates(gpsLocation);` – Reno Jul 04 '11 at 05:30

Rasel · Answer 2 · 2011-07-04T04:41:46.353

     LocationManager locationManager;
    String bestProvider;
    String LOCATION_SERVICE="location" ; 
    locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        //criteria.setAccuracy();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);  // More accurate, GPS fix.
        bestProvider = locationManager.getBestProvider(criteria,true);
    location location = locationManager.getLastKnownLocation(bestProvider);
if (location != null) {

                        EditText et_longitude = (EditText) findViewById(R.id.et_longitude);
                        EditText et_latitude = (EditText) findViewById(R.id.et_latitude);

                        et_longitude.setText(""+location.getLongitude());   // longitude textview
                        et_latitude.setText(""+location.getLatitude());     //latitude textview

                       // locationManager.removeUpdates((LocationListener) location);
                        locationManager = null;

                    }else{
                        toastkeun("Terjadi Kesalahan dalam pengambilan koordinat");             //toast function
                        error_text.setText("Terjadi Kesalahan dalam pengambilan koordinat");    //textview for showing errors
                    }

Sorry but this is wrong : `locationManager.removeUpdates((LocationListener) location)` — Reno, Jul 04 '11 at 04:37

How to get user's GPS coordinates by clicking a button?

2 Answers2