sockeqwe / adaptercommands Goto Github PK

When I set the adapter's items to an empty List twice in a row,
I get the above error at at com.hannesdorfmann.adaptercommands.command.ItemRangeRemovedCommand.<init>(ItemRangeRemovedCommand.java:40).

This is how I initialise my adapter:

        adapter = new SchoolAdapter(this);
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        commandsCalculator = new DiffCommandsCalculator<>(true, SchoolItem.ITEM_CHANGE_DETECTOR);
        commandProcessor = new AdapterCommandProcessor(adapter);

This is how I clear out my adapter:

        List<SchoolItem> schools = Collections.emptyList();
        adapter.setItems(schools);
        commandProcessor.execute(commandsCalculator.diff(schools));

Hi Hannes.

Recent versions of the support library include support for sending optional object payloads in the various notification methods of the RecyclerView.Adapter:

void notifyItemChanged (int position, 
                Object payload)

void notifyItemRangeChanged (int positionStart, 
                int itemCount, 
                Object payload)

etc...

These methods are extremely useful in determining the right animations when writing your own RecyclerView.ItemAnimator , for example by recording custom ItemInfo when recordPreLayoutInformation(..) is called and passing the right info to the various animation methods of the RecyclerView.ItemAnimator.

This is potentially a very big change therefore I am enquiring if this is out of the scope of the current release and/or is doable at all.

Would be happy do contribute with a pull request if so.