Waiting until the google map has size in a MapFragment

Question

My activity contains a MapFragment in a LinearLayout. I do the following

in onCreate:

• I inflate this layout using setContentView in the onCreate method of my activity.
• Get a handle to the GoogleMap using getMap().

in onStart:

• I get some place coordinates from an SQLite Database
• add corresponding markers to the map
• add these points to a LatLngBounds.Builder
• animate the camera using newLatLngBounds(Builder.build(), 10)

According to maps api reference, I shouldn't call newLatLngBounds(LatLngBounds bounds, int padding) before making sure that the map has a size. I indeed get an IllegalStateException at this point. But what is the right method for waiting until the map has a size?

Answer 1

The solution by rusmus didn't work for me. I used this one instead:

    map.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
        @Override
        public void onMapLoaded() {
            map.animateCamera(cameraUpdate);
        }
    });

If you know the map size, you can avoid waiting and move the camera before the map is displayed. We finally used the display size as an approximation of the map size (but you could find out the exact size if you want to be more precise):

    final DisplayMetrics display = getResources().getDisplayMetrics();
    final int padding = display.widthPixels / 20;
    final CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngBounds(
        boundsBuilder.build(), display.widthPixels, display.heightPixels, padding);
    map.moveCamera(cameraUpdate);

Answer 2

I have succesfully used the following code in the past:

final LatLngBounds.Builder builder = new LatLngBounds.Builder();
final View mapView = fragment.getView();
final GoogleMap map = fragment.getMap():

//Add points to builder. And get bounds...
final LatLngBounds bounds = builder.build();

// Pan to see all markers in view.
// Cannot zoom to bounds until the map has a size.

if (mapView.getViewTreeObserver().isAlive()) {
    mapView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {

        public void onGlobalLayout() {
            mapView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
            map.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50), 1500, null);         
        }
    });
}