Question

Aasically I’m trying to add an item from ArrayList a (allApps) to ArrayList b (myApps) but I’m getting an error.

This is what I’m trying:

public ArrayList myApps = new ArrayList(); 

@Override
public void onCreate(Bundle savedInstanceState) {
   ...
   for(final ResolveInfo app : allApps) {
        addApp(app);
    }
}

public void addApp(ResolveInfo app) {
    ArrayList.add(app); // ERROR: Cannot make a static reference to the non-static method add(Object) from the type ArrayList
}

What does this error mean and how can I get I copy an item from one array to the other?

Answer 1

You need to call add on an instance of ArrayList, not on the class itself, given your description, what you’re looking for is

public void addApp(ResolveInfo app) {
    myApps.add(app);
}