Why strange naming convention of “AlertDialog.Builder” instead of “AlertDialogBuilder” in Android

Question

Why not

AlertDialogBuilder builder = new  AlertDialogBuilder(this);
builder.setTitle(\"foo\");

instead of

AlertDialog.Builder          


        

Answer 1

The approach used to construct AlertDialog Object is called Builder Pattern to enhance readability. When you want to construct a new object but this object requires a lot of properties to create it like too many parameters (more than 4) passing to constructor you will got confused . If you want to know more about builder pattern I think this answer will satisfy your needs. AlertDialog construction is quite similar to the example in the link :

@Override 
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new AlertDialog.Builder(getActivity())
           .setMessage("Do you really want to exit?")
           .setCancelable(false)
           .setNegativeButton("No", 
                    new DaialogInterface.onClickListener() {
                            public void onClick(DialogInterface dialog, 
                            int id) {
                                    ((AlertDialogActivity) getActivity())
                                                .continueShutdown(false);
                                }

                        })
           .setPositibeButton("Yes", 
                    new DialogInterface.onClickListener()) {
                        public void onClick(
                                final DialogInterface dialog, int id) {
                                    ((AlertDialogActivity) getActivity())
                                                .continueShutdown(true);
                                }
                    }).onCreate();
}

This method return Dialog object that asks user if he/she wants to exit the application as you can see it doesn't make any sense to create an AlertDialog object by calling a constructor with too many arguments. Imagine if AlertDialog has such a constructor :

AlertDialog ad = new AlertDialog(getActivity(), "Do you really want to exit?", 
                                 false, "No", .... )//and the list goes on 

Compare this approach with onCreateDialog method I think onCreateDialog method wins right ?