CODEWITHSUNDEEP
androidgoogle-mapsgpslocation
mweb84
mweb84

Reputation: 47

Android maps v2: MyLocation-Button only works with GPS

I have a question about working with the built-in "my location"-button. In my setup I have

mMap.setMyLocationEnabled(true);

So, the button is rendered on the map and when the GPS is turned on, it works like a charm. When GPS is turned off, it doesn't work anymore. Is it standard behavior of the "my location"-button to work only when GPS is enabled?

I would like to show the rough position on the map, even GPS is disabled. Do I have to use the LocationManager to accomplish this?

Thanks

Upvotes: 2

Views: 4280

Answers (3)

Sean Barbeau
Sean Barbeau

Reputation: 11756

With Android Maps API V2, you can use the LocationSource and LocationSource.OnLocationChangedListener to pass in your own location updates and control the location that is shown on the map.

For example, you can listen to GPS_PROVIDER or NETWORK_PROVIDER location updates via a normal LocationListener, and pass these locations to the LocationSource.OnLocationChangedListener. Whatever you pass in is what gets shown on the map.

First, declare an OnLocationChangedListener object in your Activity:

private OnLocationChangedListener mListener; //Used to update the map with new location

Then, implement LocationSource for your activity, something like:

public class MapScreen extends FragmentActivity implements LocationSource {

In onCreate(), set up the LocationSource for this Activity when you're setting up the Map object:

...
// Show the location on the map
mMap.setMyLocationEnabled(true);
// Set location source
mMap.setLocationSource(this);
...

Then, add the methods required for the LocationSource interface:

/**
 * Maps V2 Location updates
 */
@Override
public void activate(OnLocationChangedListener listener) {
    mListener = listener;       
}

/**
 * Maps V2 Location updates
 */
@Override
public void deactivate() {
     mListener = null;      
}

The final part is passing in the location updates from a normal LocationListener to the Activity implementing the LocationSource:

//Update real-time location on map
if (mListener != null) {
    mListener.onLocationChanged(location);
}

If you're listening to the GPS_PROVIDER and passing locations from this provider into the mListener.onLocationChanged() method, and you turn off GPS, if you don't take any further actions with the LocationSource, the most recent GPS location will remain on the screen. At this point you can listen to the NETWORK_PROVIDER and pass these location updates to the mListener.onLocationChanged() method.

Upvotes: 5

Yar
Yar

Reputation: 4561

It looks like you must request for location updates. Even if you don't use the incoming location in your code, the blue dot appears.

Upvotes: 0

nayab
nayab

Reputation: 2380

You need to cache the last known location and show it when you dont have gps on or gps not available.

Upvotes: 1

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