The method onBackPressed() of type FirstGroup must override a superclass method

I'm trying to override the onBackPressed() method of the ActivityGroup class:

public class MyClass extends ActivityGroup {

    @Override
    public void onBackPressed() {
        // do something
        return;
    } 

but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method.

I'm relatively new to Java, I've seen here that people do it and it works for them

Why I'm getting thi开发者_运维知识库s error?

I'm writing an app for android 1.5, could the problem be here?

Edit

You need to override the back button like this

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        Log.d(this.getClass().getName(), "back button pressed");
    }
    return super.onKeyDown(keyCode, event);
}

Yes u r correct onBackPressed() method has been introduced only in API Level 5 which means you can use it only from 2.0 SDK