How to Get Latitude and Longitude from User Click on Map in Tizen Native App

Original Created Nov 25, 2017 | Regeneration Apr 22, 2026

Question

I'm working on a Tizen native application where I need to:

Display a map
Allow users to drop pins by clicking on the map
Retrieve the latitude and longitude coordinates of the clicked location

I've successfully created a basic map using the following code:

ad->map = elm_map_add(ad->conform);
evas_object_size_hint_weight_set(ad->map, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
evas_object_size_hint_align_set(ad->map, EVAS_HINT_FILL, EVAS_HINT_FILL);
elm_map_zoom_mode_set(ad->map, ELM_MAP_ZOOM_MODE_MANUAL);
elm_map_zoom_set(ad->map, 14);
evas_object_show(ad->map);
elm_map_region_show(ad->map, 72.866041, 21.229097);
elm_object_content_set(ad->conform, ad->map);

Elm_Map_Overlay *ovl = elm_map_overlay_add(ad->map, 72.866041, 21.229097);
elm_map_overlay_displayed_zoom_min_set(ovl, 8);
Evas_Object *icon = elm_icon_add(ad->map);
elm_icon_standard_set(icon, "home");
elm_map_overlay_icon_set(ovl, icon);
evas_object_smart_callback_add(ad->map, "clicked", _map_clicked_cb, ad);

Currently, I'm using static coordinates (72.866041, 21.229097). My challenges are:

How to get the current location first
How to retrieve the latitude and longitude when a user clicks on the map to drop a pin

I'm using Tizen Studio 2.0 and Mapzen maps (I already have a Mapzen API key).

Answer

Problem Understanding

The user needs to:

Display a map in a Tizen native application
Capture user clicks on the map to drop pins
Retrieve the geographic coordinates (latitude/longitude) of the clicked location

Solution Methods

Using Mapzen Maps:
- First, set up Mapzen maps with your API key
- Use the elm_map_canvas_to_region_convert() function to convert canvas coordinates to geographic coordinates when the user clicks

Complete Solution:

In your click callback function (_map_clicked_cb), use the following approach:

static void
_map_clicked_cb(void *data, Evas_Object *obj, void *event_info)
{
    Evas_Event_Mouse_Down *ev = event_info;
    double latitude, longitude;

    // Convert canvas coordinates to geographic coordinates
    elm_map_canvas_to_region_convert(obj, ev->canvas.x, ev->canvas.y, &latitude, &longitude);

    // Now you have the latitude and longitude of the clicked location
    // You can add a pin/marker at this location
    Elm_Map_Overlay *pin = elm_map_overlay_add(obj, latitude, longitude);
    // Configure your pin as needed
}

Reverse Geocoding:

Once you have the coordinates, you can use Mapzen's reverse geocoding API to get address information:

// Use the latitude and longitude to make a reverse geocoding request
// to Mapzen's API (https://mapzen.com/documentation/search/reverse/)

Code Examples

Here's a complete example for handling map clicks:

// Add this to your map creation code
evas_object_smart_callback_add(ad->map, "clicked", _map_clicked_cb, ad);

// Click callback implementation
static void
_map_clicked_cb(void *data, Evas_Object *obj, void *event_info)
{
    AppData *ad = data;
    Evas_Event_Mouse_Down *ev = event_info;
    double lat, lon;
    
    // Convert click coordinates to geographic coordinates
    elm_map_canvas_to_region_convert(obj, ev->canvas.x, ev->canvas.y, &lat, &lon);
    
    // Add a pin at the clicked location
    Elm_Map_Overlay *pin = elm_map_overlay_add(obj, lat, lon);
    Evas_Object *icon = elm_icon_add(obj);
    elm_icon_standard_set(icon, "location");
    elm_map_overlay_icon_set(pin, icon);
    
    // Store or use the coordinates as needed
    printf("Clicked at: %f, %f\n", lat, lon);
}

Additional Tips

Make sure you have proper permissions in your manifest file:

<privileges>
    <privilege>http://tizen.org/privilege/mapservice</privilege>
    <privilege>http://tizen.org/privilege/internet</privilege>
</privileges>

For current location, consider using the Location Manager API
Remember that Mapzen services might have usage limits based on your API key