Crash while search filtering

[jonas-app]

I have an issue that might be caused by misconfiguration.
In our project I use a RecyclerView with three adapters:

• HeaderAdapter
• FooterAdapter
• StickyHeaderAdapter which wraps an custom RecyclerSwipeAdapter

Following libs are used:

• com.timehop.stickyheadersrecyclerview:library:0.4.3@aar
• com.daimajia.swipelayout:library:1.2.0@aar'

All but searching is working.
If I type something into the SearchView the app is crashing with the following exception:

java.lang.NullPointerException: Attempt to invoke interface method 'boolean com.mikepenz.fastadapter.IItem.isSelected()' on a null object reference
                                         at com.mikepenz.fastadapter.utils.AdapterUtil.handleStates(AdapterUtil.java:28)
                                         at com.mikepenz.fastadapter.FastAdapter.notifyAdapterItemRangeChanged(FastAdapter.java:1100)
                                         at com.mikepenz.fastadapter.FastAdapter.notifyAdapterItemRangeChanged(FastAdapter.java:1076)
                                         at com.mikepenz.fastadapter.adapters.ItemAdapter.set(ItemAdapter.java:186)
                                         at com.mikepenz.fastadapter.adapters.ItemAdapter$ItemFilter.publishResults(ItemAdapter.java:356)
                                         at android.widget.Filter$ResultsHandler.handleMessage(Filter.java:282)
                                         at android.os.Handler.dispatchMessage(Handler.java:102)
                                         at android.os.Looper.loop(Looper.java:135)
                                         at android.app.ActivityThread.main(ActivityThread.java:5254)
                                         at java.lang.reflect.Method.invoke(Native Method)
                                         at java.lang.reflect.Method.invoke(Method.java:372)
                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

In some situations the app is only crashing by specific search caracters ('t'), so I think something is wrong with my filter.
If I return false in the filter, so nothing is filtert, it is working without any issue.
I can't find the root of the problem and want to ask you for help.
Do not hesitate to ask for more details.

Kind Regards,
Jonas Hackenberg

FastAdapter fastAdapter = new FastAdapter();
StickyHeaderAdapter stickyHeaderAdapter = new StickyHeaderAdapter();
HeaderAdapter<HeaderItem> headerAdapter = new HeaderAdapter<>();
RecyclerSwipeAdapter itemAdapter = new RecyclerSwipeAdapter<>();
FooterAdapter<FooterItem> footerAdapter = new FooterAdapter<>();
...
recyclerView.setAdapter(headerAdapter.wrap(footerAdapter.wrap(stickyHeaderAdapter.wrap(itemAdapter.wrap(fastAdapter)))));
...
itemAdapter.withFilterPredicate(new IItemAdapter.Predicate<TestItem>() {
            @Override
            public boolean filter(TestItem item, CharSequence constraint) {
                //return true if we should filter it out
                //return false to keep it
                return !item.provider.toLowerCase().contains(constraint.toString().toLowerCase());
            }
        });

RecyclerSwipeAdapter:

public class RecyclerSwipeAdapter<Item extends IItem> extends ItemAdapter<Item> implements SwipeItemMangerInterface, SwipeAdapterInterface {

    public SwipeItemRecyclerMangerImpl mItemManger = new SwipeItemRecyclerMangerImpl(this);

    @Override
    public int getSwipeLayoutResourceId(int position) {
        return R.id.swipe;
    }

    @Override
    public void openItem(int position) {
        mItemManger.openItem(position);
    }

    @Override
    public void closeItem(int position) {
        mItemManger.closeItem(position);
    }

    @Override
    public void closeAllExcept(SwipeLayout layout) {
        mItemManger.closeAllExcept(layout);
    }

    @Override
    public void closeAllItems() {
        mItemManger.closeAllItems();
    }

    @Override
    public List<Integer> getOpenItems() {
        return mItemManger.getOpenItems();
    }

    @Override
    public List<SwipeLayout> getOpenLayouts() {
        return mItemManger.getOpenLayouts();
    }

    @Override
    public void removeShownLayouts(SwipeLayout layout) {
        mItemManger.removeShownLayouts(layout);
    }

    @Override
    public boolean isOpen(int position) {
        return mItemManger.isOpen(position);
    }

    @Override
    public Attributes.Mode getMode() {
        return mItemManger.getMode();
    }

    @Override
    public void setMode(Attributes.Mode mode) {
        mItemManger.setMode(mode);
    }
}

StickyHeaderAdapter:

public class StickyHeaderAdapter extends AbstractAdapter implements StickyRecyclerHeadersAdapter {
    @Override
    public long getHeaderId(int position) {
        IItem item = getItem(position);

        if (item instanceof TestItem && ((Testtem) item).category != null) {
            return ((TestItem) item).category.position;
        }
        return -1;
    }

    @Override
    public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
        //we create the view for the header
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_test_category, parent, false);
        return new RecyclerView.ViewHolder(view) {
        };
    }

    @Override
    public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
        TextView name = (TextView) holder.itemView.findViewById(R.id.name);
        ImageView icon = (ImageView) holder.itemView.findViewById(R.id.icon);

        IItem item = getItem(position);
        if (item instanceof TestItem && ((TestItem) item).category != null) {
            //based on the position we set the headers text
            name.setText(((TestItem) item).category.name);
            icon.setImageResource(((TestItem) item).category.resource);
        }
    }

    /**
     * REQUIRED FOR THE FastAdapter. Set order to < 0 to tell the FastAdapter he can ignore this one.
     **/

    /**
     * @return
     */
    @Override
    public int getOrder() {
        return -100;
    }

    @Override
    public int getAdapterItemCount() {
        return 0;
    }

    @Override
    public List<IItem> getAdapterItems() {
        return null;
    }

    @Override
    public IItem getAdapterItem(int position) {
        return null;
    }

    @Override
    public int getAdapterPosition(IItem item) {
        return -1;
    }

    @Override
    public int getGlobalPosition(int position) {
        return -1;
    }

}

[mikepenz]

@jonas-arkulpa should be fixed in the next version. The root cause seems that you have a selected item in some cases. The filtering will now deselect all selections before filtering.

[Rainer-Lang]

@mikepenz And what will happen if the filter is empty? Will the selections be restored?

[mikepenz]

@Rainer-Lang no it won't.

[Rainer-Lang]

That's not "nice". ;)

[jonas-app]

@mikepenz thanks for the quick reply and fix.

[vinayakmestri]

I have created custom edittext which does not hangs or crash the app.
SearchTimerEditText