android - Best way of handling recreated dialog fragment after activity is destroyed and recreated -

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i have activity may show dialogfragments. activity needs response dialogs. use listener. in activity:

progressmarkdialog dialog = new progressmarkdialog(); dialog.setonprogressmarkselected(new progressmarkdialog.onprogressmarkselected() {     @override     public void onselect(final int a) {     //some code..         } });

in dialog:

public void setonprogressmarkselected(onprogressmarkselected onprogressmarkselected) {     this.onprogressmarkselected = onprogressmarkselected; }

this code works fine until somehow activity destroyed, dialog still open. program crash nullpointerexception because onprogressmarkselected null.

i can use

@override public void onattach(final activity activity) {     super.onattach(activity);     onprogressmarkselected = (onprogressmarkselected) activity; }

and implement interface in activity. if have few dialogfragments, means should implement few interface in activity , code messy. android best practice case?

in opinion best way stick standard positive/negative buttons , attaching dialoginterface.onclicklistener shown in http://developer.android.com/reference/android/app/dialogfragment.html

look @ way: standard android user expects see positive and/or negative button in dialog. activity -if needed- should informed result (positive, negative input data) of dialog. other input validation should handled inside dialogfragment


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