Question

is it possible to create a function to shorten casts, like (pseudocode):

MyFragment fragment = (MyFragment) getFragmentManager().findFragmentByTag("mytag");
//shorten:
findByTag(MyFragment.class, "mytag");


private Fragment findByTag(Class<?> cast, String tag) {
    return (cast) getFragmentManager().findFragmentByTag(tag);
}

Answer 1

Fix your code as following:

private <F extends Fragment> F findByTag(Class<F> cast, String tag) {
    return (F) getFragmentManager().findFragmentByTag(tag);
}

Now you can call it without casting:

MyFragment f1 = findByTag(MyFragment.class, "aaaaa");
YourFragment f2 = findByTag(YourFragment.class, "bbbbb");