How to extend class with two another classes?

Question

I want to extend my class with 2 other classes Fragment and Activity. I tried this:

public class Frist extends Fragment , Activity 
{
      .....
      .....
}

But it's not working. How can I fix it?

Interesting problem you have there, why would you want to do this? — Arlind Hajredinaj, Jul 10 '15 at 18:14
Similar: http://stackoverflow.com/questions/5836662/extending-from-two-classes. In short, you can't extend explicitly two classes. — Pshemo, Jul 10 '15 at 18:15
Java does not support iheriting from multiple classes http://stackoverflow.com/questions/10839131/implements-vs-extends-when-to-use-whats-the-difference — André Schild, Jul 10 '15 at 18:15
... `extends Fragment , activity` is a pure **nonsense**. It's a Fragment? Then it can't be an Activity. It's an Activity? Then it can't be a Fragment. You can't have an animal which is `cat AND dog` at the same time. — Phantômaxx, Jul 10 '15 at 18:40
@DerGol...lum, but you can have an animal which is both a Vertebrate and a Pet, or an animal which is both a Bird and a Predator. — Solomon Slow, Jul 10 '15 at 19:27
@DerGol...lum it's not nonsense since other languages (like C++) have *multiple inheritance* (and other features built upon this one, like *virtual inheritance*). — Lucas Trzesniewski, Jul 10 '15 at 21:33
@LucasTrzesniewski Sure. But, **as you should know**, as an **Android developer**, a `Fragment` is a **very different thing** from an `Activity`. — Phantômaxx, Jul 11 '15 at 07:02
@Gol...lum ok, I thought you were talking about the mechanism itself. — Lucas Trzesniewski, Jul 11 '15 at 08:26
@LucasTrzesniewski No, I was talking about Fragment and Activity. No matter, though. — Phantômaxx, Jul 11 '15 at 10:53

score 1 · Answer 1 · answered Jul 10 '15 at 18:15

1

You should use decorator or composition pattern

answered Jul 10 '15 at 18:15

Tkachuk_Evgen

1,334
11
17

score 1 · Accepted Answer · answered Jul 10 '15 at 18:16

1

You can't extend multiple classes. Why you can't extend fragment in another class?

answered Jul 10 '15 at 18:16

krystian71115

1,927
17
36

score 1 · Answer 3 · answered Jul 10 '15 at 21:42

Java does not support multiple inheritance
Fragment and activity both are completely different thing.
If your want to make activity having fragment over it then in android studio create project with Activity with Fragment instead of with Blank activity
Then Automatically android studio will provide with some code having fragment and classes and xml for it.

How to extend class with two another classes?

3 Answers3