Question

I’m working on an Android app. I created (in a separate .java file) an object like so:

class RRS_Location {
String tagname;
String href;

// Constructor
public RRS_Location(String tagname, String href) {
    this.tagname = tagname;
    this.href = href;
}

public String getTagname()  {
    return tagname;
}

public String getHref() {
    return href;
}
}

Within an activity, I’ve declared a List of these items
List<RRS_Location> rrs_list;

I’m getting a NullPointerException when I try to add an RRS_Location object to the list. I’m doing so using this code
rrs_list.add(new RRS_Location(e1, e2));

I’ve used Toast to echo back to me that I have valid Strings e1 and e2. Any ideas on why I’m getting the exception? TIA!

Answer 1

Are you instantiating rrs_list before making the call to add?

List<RRS_Location> rrs_list = new ArrayList<RRS_Location>();

If not, this is why you are getting a NullPointerException, you are attempting to invoke a method on a null object.