Android - How can I pass myFragment.class as a parameter to a function

Question

I'm creating a Tab Fragment with custom Tab controls as follows

View tabView = createTabView(getActivity(),"Tab 1");
mTabHost.addTab(mTabHost.newTabSpec("tab1").setIndicator(tabView),
                Tab1Fragment.class, null);

But rather than have these two lines of code for every tab in the view I'd like to create a generic function eg

private void addTab(String sTag, String sTitle, Class<Fragment> cls) {
    View tabView = createTabView(getActivity(),sTitle);
    mTabHost.addTab(mTabHost.newTabSpec(sTag).setIndicator(tabView),
    cls, null);
}

The problem is I can't work out how to cast Tab1Fragment.class to pass it into the function

Answer 1

Generics in Java are not covariant, viz. you cannot pass in a subtype of Fragment to satisfy the generic parameter type of Fragment. This is the correct way to do what you want:

private <T extends Fragment> void addTab(String sTag, String sTitle, Class<T> cls) {
    View tabView = createTabView(getActivity(),sTitle);
    mTabHost.addTab(mTabHost.newTabSpec(sTag).setIndicator(tabView),
            cls, null);
}