I filter the RecyclerView of my app with a SearchView exactly like described in this post:
How to filter a RecyclerView with a SearchView
At the beginning everything looked fine and I could filter the RecyclerView as wanted, but after some playing around, two problems showed up:
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.scherrer.robin.chvote, PID: 28406 java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewGroup$LayoutParams android.view.View.getLayoutParams()' on a null object reference at com.tonicartos.superslim.LayoutManager.getAnchorAtEnd(LayoutManager.java:1038) at com.tonicartos.superslim.LayoutManager.fillNextSectionToEnd(LayoutManager.java:725) at com.tonicartos.superslim.LayoutManager.layoutChildren(LayoutManager.java:1369) at com.tonicartos.superslim.LayoutManager.onLayoutChildren(LayoutManager.java:276) at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2906) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3283) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:122) at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42) at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1192) at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:814) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678) at android.view.View.layout(View.java:16630) at android.view.ViewGroup.layout(ViewGroup.java:5437) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) at android.view.Choreographer.doCallbacks(Choreographer.java:670) at android.view.Choreographer.doFrame(Choreographer.java:606) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.jav
At first I thought, the error occurs because the filtermethod takes too long and is executed again before it has finished, but with writing into the log, I found out that this isn't causing the issue.
FATAL EXCEPTION: main Process: com.scherrer.robin.chvote, PID: 473 java.lang.IndexOutOfBoundsException: Invalid item position 145(145). Item count:20 at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4622) at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617) at com.tonicartos.superslim.LayoutState.getView(LayoutState.java:48) at com.tonicartos.superslim.LayoutManager.getHeaderOrFirstViewForSection(LayoutManager.java:1242) at com.tonicartos.superslim.LayoutManager.fillToEnd(LayoutManager.java:840) at com.tonicartos.superslim.LayoutManager.fillUntil(LayoutManager.java:908) at com.tonicartos.superslim.LayoutManager.scrollVerticallyBy(LayoutManager.java:361) at android.support.v7.widget.RecyclerView.scrollByInternal(RecyclerView.java:1529) at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:2486) at android.view.View.dispatchTouchEvent(View.java:9294) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2547) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2240) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553) at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403) at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1737) at android.app.Activity.dispatchTouchEvent(Activity.java:2765) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364) at android.view.View.dispatchPointerEvent(View.java:9514) at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3642) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5922) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5896) at android.view.View
To make the header items in the RecyclerView sticky, I use a library called Super SLiM
The adapter:
public class RfrdAdapter extends RecyclerView.Adapter<RfrdViewHolder> {
private final LayoutInflater mInflater;
private final List<AdapterBaseRow> mModels;
private static final int VIEW_TYPE_HEADER = 0x01;
private static final int VIEW_TYPE_RFRD_OPEN = 0x02;
private static final int VIEW_TYPE_RFRD_PAST = 0x03;
public RfrdAdapter(Context context, List<AdapterBaseRow> models) {
this.mInflater = LayoutInflater.from(context);
this.mModels = new ArrayList<>(models);
}
@Override
public RfrdViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = null;
switch (viewType) {
case VIEW_TYPE_HEADER:
itemView = mInflater.inflate(R.layout.rfrd_list_title, parent, false);
break;
case VIEW_TYPE_RFRD_OPEN:
itemView = mInflater.inflate(R.layout.open_referendum, parent, false);
break;
case VIEW_TYPE_RFRD_PAST:
itemView = mInflater.inflate(R.layout.past_referendum, parent, false);
break;
default:
Log.e("CHVote", "viewType not specified");
break;
}
return new RfrdViewHolder(itemView);
}
@Override
public int getItemViewType(int position) {
int itemViewType = 0;
if (mModels.get(position) instanceof AdapterRowHeader) {
itemViewType = VIEW_TYPE_HEADER;
} else if (mModels.get(position) instanceof AdapterRowRfrdPast) {
itemViewType = VIEW_TYPE_RFRD_PAST;
} else if (mModels.get(position) instanceof AdapterRowRfrdOpen) {
itemViewType = VIEW_TYPE_RFRD_OPEN;
}
return itemViewType;
}
@Override
public void onBindViewHolder(RfrdViewHolder holder, int position) {
final AdapterBaseRow model = mModels.get(position);
final View itemView = holder.itemView;
final LayoutManager.LayoutParams params;
holder.bind(model);
params = (LayoutManager.LayoutParams) itemView.getLayoutParams();
params.setSlm(LinearSLM.ID);
params.setFirstPosition(model.sectionFirstPosition);
itemView.setLayoutParams(params);
}
@Override
public int getItemCount() {
return mModels.size();
}
public void animateTo(List<AdapterBaseRow> models) {
applyAndAnimateRemovals(models);
applyAndAnimateAdditions(models);
applyAndAnimateMovedItems(models);
Log.d("tag", "Finshed filtering");
}
private void applyAndAnimateRemovals(List<AdapterBaseRow> newModels) {
for (int i = mModels.size() - 1; i >= 0; i--) {
final AdapterBaseRow model = mModels.get(i);
if (!newModels.contains(model)) {
removeItem(i);
}
}
}
private void applyAndAnimateAdditions(List<AdapterBaseRow> newModels) {
for (int i = 0, count = newModels.size(); i < count; i++) {
final AdapterBaseRow model = newModels.get(i);
if (!mModels.contains(model)) {
addItem(i, model);
}
}
}
private void applyAndAnimateMovedItems(List<AdapterBaseRow> newModels) {
for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
final AdapterBaseRow model = newModels.get(toPosition);
final int fromPosition = mModels.indexOf(model);
if (fromPosition >= 0 && fromPosition != toPosition) {
moveItem(fromPosition, toPosition);
}
}
}
public AdapterBaseRow removeItem(int position) {
final AdapterBaseRow model = mModels.remove(position);
notifyItemRemoved(position);
return model;
}
public void addItem(int position, AdapterBaseRow model) {
mModels.add(position, model);
notifyItemInserted(position);
}
public void moveItem(int fromPosition, int toPosition) {
final AdapterBaseRow model = mModels.remove(fromPosition);
mModels.add(toPosition, model);
notifyItemMoved(fromPosition, toPosition);
}
}
The Fragment with the RecyclerView:
public class MainFragment extends Fragment implements SearchView.OnQueryTextListener {
public static MainFragment newInstance() {
return new MainFragment();
}
private RecyclerView mRecyclerView;
private RfrdAdapter mAdapter;
private List<AdapterBaseRow> mModels;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_main, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.lvRef);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
this.mRecyclerView.setLayoutManager(new LayoutManager(getActivity()));
AdapterData adapterData = new AdapterData();
this.mModels = adapterData.getRfrdData();
mAdapter = new RfrdAdapter(getActivity(), mModels);
mRecyclerView.setAdapter(mAdapter);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
}
@Override
public boolean onQueryTextChange(String query) {
final List<AdapterBaseRow> filteredModelList = filter(mModels, query);
Log.d("tag","Started filtering");
mAdapter.animateTo(filteredModelList);
mRecyclerView.scrollToPosition(0);
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
private List<AdapterBaseRow> filter(List<AdapterBaseRow> models, String query) {
final List<AdapterBaseRow> filteredModelList = new ArrayList<>();
final ArrayList<String> searchableTxt = new ArrayList<String>();
query = query.toLowerCase();
for (AdapterBaseRow model : models) {
if (model instanceof AdapterRowHeader) {
final String searchTxtVotingDateHeader = ((AdapterRowHeader) model).getVotingDateTxt().toLowerCase();
searchableTxt.add(searchTxtVotingDateHeader);
} else if (model instanceof AdapterRowRfrdOpen) {
final String searchTxtTitleRfrdOpen = ((AdapterRowRfrdOpen) model).getOpenRfrd().getTitle().toLowerCase();
searchableTxt.add(searchTxtTitleRfrdOpen);
final String searchTxtVotingDateRfrdOpen = ((AdapterRowRfrdOpen) model).getOpenRfrd().getVotingDateTxt().toLowerCase();
searchableTxt.add(searchTxtVotingDateRfrdOpen);
} else if (model instanceof AdapterRowRfrdPast) {
final String searchTxtTitleRfrdPast = ((AdapterRowRfrdPast) model).getPastRfrd().getTitle().toLowerCase();
searchableTxt.add(searchTxtTitleRfrdPast);
final String searchTxtVotingDateRfrdPast = ((AdapterRowRfrdPast) model).getPastRfrd().getVotingDateTxt().toLowerCase();
searchableTxt.add(searchTxtVotingDateRfrdPast);
}
for (String sTxt : searchableTxt) {
if (sTxt.contains(query)) {
filteredModelList.add(model);
break;
}
}
searchableTxt.clear();
}
return filteredModelList;
}
}
I've looked at many threads here and tried lots of different combinations, but can't seem to be able to get past this problem.
Any help much appreciated.
After some tests, I found out the problem is that the superSLiM library needs a customized LayoutManager, but filtering works only with LinearLayoutManager.
Has anybody an idea how to convert the LayoutManager?