Extending Class For Activity

I'm totally new to Android (Java) Development and I'm so excited about it! The developers guide of Google is fantastic and I learned a lot in a small time. It even keeps me awake d

Solution 1:

What they mean is the following:

Normally you would have:

publicclassMyActivityextendsActivity{...}

If you have 4-5-6... of those activities, and each of them uses the same menu code, you could just copy and paste the code 4-5-6.. times. Or you could do this:

publicclassBaseActivityextendsActivity{

    @OverridepublicbooleanonCreateOptionsMenu(Menu menu) {
        //My menu code  
    }
}

And use this class for your 4-5-6... Activities:

publicclassMyActivityextendsBaseActivity{...}

This way you don't need to copy your menu creation code into all your Activities, and moreover, you don't have to edit 4-5-6... classes to edit a small bit of creation of the menu. The menu code is now also in MyActivity.

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You could also have a look here, it explains what extends means.

Solution 2:

It's quite simple really.

MainMenuActivity

publicclassMainMenuActivityextendsActivity {
   //Override or add whatever functionality you want other classes to inherit.
}

MainActivity

publicclassMainActivityextendsMainMenuActivity {
   //Add what is specific to MainActivity. The menu will be inherited from MainMenuActivity.
}

SubActivity

publicclassSubActivityextendsMainMenuActivity {
   //Add what is specific to SubActivity. The menu will be inherited from MainMenuActivity.
}