使用SearchView筛选RecyclerView

Question

我用SearchView过滤我的应用程序的RecyclerView，与本文中描述的完全相同：

如何使用SearchView 过滤RecyclerView

一开始一切看起来都很好，我可以根据需要过滤RecyclerView，但经过一番尝试，出现了两个问题：

1. 如果我在SearchView中输入文本过快，应用程序将崩溃，并显示以下日志：

E/AndroidRuntime:致命异常：main流程：com.scherrer.robin.chvote，PID:28406java.lang.NullPointerException：尝试调用虚拟方法'android.view.ViewGroup$LayoutParamsandroid.view.view.getLayoutParams()'在com.tonicartos.superslim.LayoutManager.getAnchorAtEnd(LayoutManager.java:1038)在com.tonicartos.superslim.LayoutManager.fillNextSectionToEnd(LayoutManager.java:725)在com.tonicartos.superlim.LayoutManager.layoutChildren(LayoutManager.java：1369)在com.tonicartos.superlim.LayoutManager.onLayoutChildren(LayoutManager.java:276)在android.support.v7.widget.CyclerView.dispatchLayoutStep2(RecyclerView.java：3028)在android.support.v7.widget.CyclerView.dispatchLayout(RecyclerView.java:2906)在android.support.v7.widget.CyclerView.onLayout(RecyclerView.java：3283)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)在android.widget.FrameLayout.onLayout(FrameLayout.java:273)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)在android.widget.FrameLayout.onLayout(FrameLayout.java:273)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingView Behavior.java:122)在android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)在android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1192)在android.support.design.widget.CommunicatorLayout.onLayout(CoordinatorLayout.java:814)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)在android.widget.FrameLayout.onLayout(FrameLayout.java:273)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)在android.widget.LinearLayout.layoutVertical(LinearLayout.java：1586)在android.widget.LinearLayout.onLayout(LinearLayout.java:1495)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)在android.widget.FrameLayout.onLayout(FrameLayout.java:273)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743)在android.widget.LinearLayout.layoutVertical(LinearLayout.java：1586)在android.widget.LinearLayout.onLayout(LinearLayout.java:1495)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)在android.widget.FrameLayout.onLayout(FrameLayout.java:273)在com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2678)在android.view.view.layout(view.java：16630)在android.view.ViewGroup.layout(ViewGroup.java：5437)在android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2171)在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1931)在android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)在android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)在android.view.Cchoreographer$CallbackRecord.run(Choreographer.java：858)在android.view.Cchoreographer.doCallbacks(Choreographer.java:670)位于android.view.Cchoreographer.doFrame(Choreographer.java：606)在android.view.Cchoreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)在android.os.Handler.handleCallback(Handler.java:739)在android.os.Handler.dispatchMessage(Handler.java:95)在android.os.Looper.loop(Looper.java:148)在android.app.ActivityThread.main(ActivityThreads.jav

起初，我认为发生错误是因为filtermethod花费了太长时间，并且在完成之前再次执行，但通过写入日志，我发现这并不是问题的原因。

2. 我一过滤并向下滚动，应用程序就会崩溃，并显示以下日志：

致命异常：main流程：com.scherrer.robin.chvote，PID:473java.lang.IndexOutOfBoundsException：无效的项位置145(145)。物品数量：20位于android.support.v7.widget.CyclerView$Recycler.getViewForPosition(RecyclerView.java:4622)位于android.support.v7.widget.CyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)网址：com.tonicartos.superslim.LayoutState.getView(LayoutState.java:48)网址：com.tonicartos.superslim.LayoutManager.getHeaderOrFirstViewForSection(LayoutManager.java:1242)网址：com.tonicartos.superslim.LayoutManager.fillToEnd(LayoutManager.java:840)网址：com.tonicartos.superslim.LayoutManager.fillUntil(LayoutManager.java:908)网址：com.tonicartos.superslim.LayoutManager.scrollVerticalyBy(LayoutManager.java:361)在android.support.v7.widget.CyclerView.scrollByInternal(RecyclerView.java:1529)在android.support.v7.widget.CyclerView.onTouchEvent(RecyclerView.java:2486)在android.view.view.dispatchTouchEvent(view.java：9294)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java：2547)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2240)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)在android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2553)在android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2254)网址：com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2403)网址：com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java：1737)在android.app.Activity.dispatchTouchEvent(Activity.java:2765)在android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrappr.java:60)在android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrappr.java:60)网址：com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2364)在android.view.view.dispatchPointerEvent(view.java:9514)在android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4230)在android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4096)在android.view.ViewRootImpl$InputStage.delive(ViewRootImpl.java:3642)在android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)在android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)在android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3787)在android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)在android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3844)在android.view.ViewRootImpl$InputStage.delive(ViewRootImpl.java:3642)在android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3695)在android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3661)在android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3669)在android.view.ViewRootImpl$InputStage.delive(ViewRootImpl.java:3642)在android.view.ViewRootImpl.deliveryInputEvent(ViewRootImpl.java:5922)在android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5896)在android.view.view

为了使RecyclerView中的标题项目具有粘性，我使用了一个名为Super SLiM 的库

适配器：

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);
}

}

带回收器的碎片视图：

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;
}
}

我看了很多线程，尝试了很多不同的组合，但似乎无法解决这个问题。

非常感谢您的帮助。

Answer 1

我有一个带有superslim的回收视图，并尝试放置一个搜索视图(我在碎片回收视图中使用edittext)

我在过滤结果、标题错误等方面遇到了很多问题。最后，我创建了一个非优雅的解决方案，但工作良好，易于实现：

首先，你必须让你的适配器和superlim循环使用(你可以看到所有的项目都堆叠在你的标题上)

其次，我的解决方案是用过滤后的结果重新创建数据(数组)，并用一些逻辑重建适配器：

//event on write in filter field
buscador.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
//get the word...
String text = buscador.getText().toString().toLowerCase(Locale.getDefault());

if(text.isEmpty()){
//if text is empty  we load all results (no filter results)
actividades.clear();
actividades.addAll(actividadescopia); //actividadescopia is a clone of actividades(data for populate recyclerview, and all results without filtered)
} else{
//if no empty (searching a word)...
//we create a array for results finds...
ArrayList<ActividadBean> result = new ArrayList<>();
text = text.toLowerCase();
for(ActividadBean item: actividadescopia){
if(item.getTitulo()!=null) {
if (item.getTitulo().toLowerCase().contains(text)) {
//...add to results if find coincidence
result.add(item);
}
}
}
//populate array with the results
actividades.clear();
actividades.addAll(result);
}
if(actividades.size()>0) { //if we have results...
//...inicialize adapter and set in recyclerview
mAdapter = new ListaBusquedaAdapter(getActivity(), mHeaderDisplay, actividades);
mRecyclerView.setAdapter(mAdapter);
//...and set recyclerview visible for see results (see below)
mRecyclerView.setVisibility(View.VISIBLE);
}else{
//..if we haven't results we hide the recyclerview for show that nothing is finding with filtered word
mRecyclerView.setVisibility(View.GONE);
}
}
@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
}
});

我希望它能帮助你(对不起，我不是英语母语)

Answer 2

经过一些测试，我发现问题是superSLiM库需要一个自定义的LayoutManager，但过滤只适用于LinearLayoutManager。

有人知道如何转换LayoutManager吗？