How To Correctly Call A Method With Parameter Of Generic Type And Get Rid Of The "unchecked Call To Member Of Raw Type" Warning

I have created a base class for different subclasses of adapters for my list, which it has a List field with generic type. The code of the class is as below: public class ListBaseA

Solution 1:

For your example cases, you should also initialize them with a type, i.e.:

publicclassUserListAdapterextendsListBaseAdapter<Users> {...}
publicclassAddressListAdapterextendsListBaseAdapter<Address> {...}

If you want to maintain only a single reference but still be able to pass in specific types, then given the code you provided, what I'd recommend would be something along these lines:

publicclassTheListFragmentextendsListFragment {
    // You really don't even need to keep a reference to this// since it can be retrieved with getListAdapter()private ListBaseAdapter<?> adapter;

    publicvoidonActivityCreated(@Nullable Bundle savedInstanceState) {
        ...
        switch(type) {
            case1:
                UserListAdapteruserAdapter=newUserListAdapter();
                userAdapter.setDataset(users);
                adapter = userAdapter;
                break;
            case2:
                AddressListAdapteraddressAdapter=newAddressListAdapter();
                addressAdapter.setDataset(addresses);
                adapter = addressAdapter;
                break;
        }

        setListAdapter(adapter);
    }
}

Provided you don't need to make future data assignments to the adapter, that will do the trick. Your field is only of type ListBaseAdapter<?>, but your local variables are of the specific type, so you can work with them directly, and then assign them to the more weakly-typed field adapter.