Crossed out onAttach(activity) = deprecated ?

Unfortunately as the Android SDK evolves, things get changed. A deprecated method means that you can still use it, but warning that it may be removed from future versions of the interface, so at some point your code will break. It is a pain, but you have to either change your code, or find a way to support both versions. Here's a possible solution:

http://stackoverflow.com/questions/32083053/android-fragment-onattach-deprecated

 

This worked for me when i have userdefind interface 'TopSectionFragment' and its object activitycommander:

//This method gets called whenever we attach fragment to the activity
@override
public void onAttach(Context context) {
super.onAttach(context);
Activity a=getActivity();
try {
if(context instanceof Activity)
this.activitycommander=(TopSectionListener)a;
}catch (ClassCastException e){
throw new ClassCastException(a.toString());}

}