Extended OverlayItem causes program to crash with NullPointerException

Question

I have a class which extends OverlayItem to include more fields. I have changed all the OverlayItem occurrences in my program with a PointOfInterest class.

When I try to run the same program which worked for OverlayItem, it crashes with a nullpointerException after calling populate() in my ItemizedOverlay class. The Log prints out the correct value. Here is the method it crashes in.

protected void addOverlay(PointOfInterest pointOfInterest) {

    mapOverlays.add(pointOfInterest);
    setLastFocusedIndex(-1);
    Log.d("Add Overlay", pointOfInterest.getDescription());
    populate(); <-- Crashes here
}

And the error

12-06 17:29:03.610: E/AndroidRuntime(1822): java.lang.NullPointerException
12-06 17:29:03.610: E/AndroidRuntime(1822):     at com.google.android.maps.ItemizedOverlay.populate(ItemizedOverlay.java:312)
12-06 17:29:03.610: E/AndroidRuntime(1822):     at com.example.mapproject.OurItemizedOverlay.addOverlay(OurItemizedOverlay.java:108)
12-06 17:29:03.610: E/AndroidRuntime(1822):     at com.example.mapproject.MainActivity.addPointToMap(MainActivity.java:211)

Any ideas? Thanks !

Answer 1

Figured it out, I failed to mention that the PointOfInterest being passed to the addOverlay method was created from a JSON String, therefore the constructor which contains

super(point, title, snippet)

was never being called.

I added this to my the addOverlay method which seems to have sorted it !

protected void addOverlay(PointOfInterest pointOfInterest) {

    PointOfInterest pointOfInterest2 = new PointOfInterest(pointOfInterest.title,pointOfInterest.title,pointOfInterest.type,pointOfInterest.point,pointOfInterest.privateField);
    mapOverlays.add(pointOfInterest2);
    setLastFocusedIndex(-1);
    Log.d("Add Overlay", pointOfInterest2.getSnippet());
    populate();

}