Android : Is possible to stop process while alert dialog finish its work?

This is my method

public void getValues() {
            alertDialog = new AlertDialog.Builder(MainActivity.this);
            LayoutInflater inflater = this.getLayoutInflater();
            alertDialog.setView(inflater.inflate(R.layout.custom_layout, null));

            alertDialog.setCancelable(false);

            alertDialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    field1 = (EditText)((Dialog) dialog).findViewById(R.id.field1);
                    field2 = (EditText)((Dialog) dialog).findViewById(R.id.field2);
                    errorMsg = (TextView)((Dialog) dialog).findViewById(R.id.login_error);
                    insert();
                }
            });

            /* When negative (No/cancel) button is clicked*/
            alertDialog.setNegativeButton("Back", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel(); // Your custom code
                }
            });
            alertDialog.show();
}

I need this method to create an input dialog that get the values that I need to check in my database.

These method work with this code

MyClass object = createObject();
while(!checkDB(object))
        {
            //Alert Dialog
            getValues();
        }

Well, createObject() get some information in another part of code and create an object from class MyClass. checkDB search the object in my database;

My logic is: if the object that I search don't exists I will create it with the AlertDialog (method getValues() that with method insert() insert the new object in DB).

The problem is that if I use a while procedure, my AlertDialog won't create and so !checkDB(object) is always false!

How can I use this alertDialog in the while?

Thanks for answer