Question

I have a class ListFragment

 public class ListFragment<T> extends DialogFragment {

when i try to cast an object to a specific type of ListFragment in this case a String

ListFragment<String> lfst = (ListFragment<String>)getFragmentManager().findFragmentByTag("somePicker");

It gives me a warning Type safety: Unchecked cast from Fragment to ListFragment

To remove the warning I have to add @SuppressWarnings("unchecked")

The reason I need ListFragment<String> as I will be calling a method that depends on the use of String.

So is there a way to achieve this without using a suppress warning. Note this code is being written for use on Android.

Answer 1

In a word, no. The findFragmentByTag method doesn’t know that it will be returning a ListFragment and the superclass, Fragment, has no type parameters itself.

The best that you can do is suppress the warning as you have done.