10

friends,

any one guide me what is the purpose of Super class in android i have seen in many @Override methods. for example

@Override
        protected void onProgressUpdate(final Object... args) 
         {   super.onProgressUpdate(args);
}

@Override
        protected void onPostExecute(Boolean result) {
            super.onPostExecute(result);
}

@Override     
        protected void onPreExecute() {
            super.onPreExecute();
}

any help would be appreciated.

UMAR-MOBITSOLUTIONS
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    If your override methods only look like that, you should not be overriding them at all. Only override when you need to alter or add functionality to a method. – unholysampler Apr 27 '11 at 15:00
  • Take a look at Raghav Sood's answer and comment under it. (http://stackoverflow.com/a/14671985/1808829) He explained very clearly. – Ayaz Alifov Nov 26 '14 at 10:50

3 Answers3

7

Using the Keyword super

Briefly: if you override some method (onProgressUpdate,..) in your class but want to use original one from parent class you use super keyword.

I recommend you using super as in example to prevent breaking parent class logic.

unholysampler
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underwood
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4

The superclass of a class is the class that the class was extended from, or null if it wasn't extended.

for example, say you have a class called object, containing an onDestroy() method. If you then make a class based on object, called textbox, that extends(inherits) object, and thus has all the methods found in object. If you have no onDestroy() specifically for textbox, the onDestroy() inherited from object would get called, if you create your own onDestroy() to override the one from object that one will be called instead.

To make sure you are not missing important functionality that should come with textbox being an object, such as correct memory management when destroying the class, it's important to also do what would be done for an object, not only what you want to do for your textbox, this is done by calling the super.onDestroy(), which in this case would essentially call object.onDestroy().

Nisse
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in super class many hardware interaction, memory management codes are written which are necessary for performing these function so if you override any method then u can write your own codes and let the other complexity handles by super class of android

Sunil Pandey
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