我在实现recyclerview而不是listview时遇到问题。使用listview检测到没有问题，但使用recyclerview我有以下错误
java.lang.NullPointerException
14204 AndroidRuntime E at android.widget.FrameLayout.onMeasure(FrameLayout.java:309)
14204 AndroidRuntime E at android.view.View.measure(View.java:16654)
14204 AndroidRuntime E at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5150)
14204 AndroidRuntime E at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
14204 AndroidRuntime E at android.view.View.measure(View.java:16654)
14204 AndroidRuntime E at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5150)
14204 AndroidRuntime E at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
14204 AndroidRuntime E at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2421)
14204 AndroidRuntime E at android.view.View.measure(View.java:16654)
14204 AndroidRuntime E at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2064)
14204 AndroidRuntime E at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1189)
14204 AndroidRuntime E at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1374)
14204 AndroidRuntime E at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1076)
14204 AndroidRuntime E at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5913)
14204 AndroidRuntime E at android.view.Choreographer$CallbackRecord.run(Choreographer.java:807)
14204 AndroidRuntime E at android.view.Choreographer.doCallbacks(Choreographer.java:601)
14204 AndroidRuntime E at android.view.Choreographer.doFrame(Choreographer.java:562)
14204 AndroidRuntime E at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:791)
14204 AndroidRuntime E at android.os.Handler.handleCallback(Handler.java:733)
14204 AndroidRuntime E at android.os.Handler.dispatchMessage(Handler.java:95)
14204 AndroidRuntime E at android.os.Looper.loop(Looper.java:157)
14204 AndroidRuntime E at android.app.ActivityThread.main(ActivityThread.java:5867)
14204 AndroidRuntime E at java.lang.reflect.Method.invokeNative(Native Method)
14204 AndroidRuntime E at java.lang.reflect.Method.invoke(Method.java:515)
14204 AndroidRuntime E at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
14204 AndroidRuntime E at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:674)
14204 AndroidRuntime E at dalvik.system.NativeStart.main(Native Method)
这是我的适配器
public class SearchPoiAdapter extends RecyclerView.Adapter<SearchPoiAdapter.SearchPoiAdapterHolder> {
private IPoiListener mListener;
private List<Poi> mSearchings;
public interface IPoiListener {
public void onClickPoi(Poi poi);
public void noPoi();
}
public SearchPoiAdapter(IPoiListener listener) {
this.mListener = listener;
}
public SearchPoiAdapter(List<Poi> pSearchings, IPoiListener listener) {
this.mListener = listener;
if (pSearchings != null) {
mSearchings = pSearchings;
} else {
mSearchings = new ArrayList<>();
}
}
public static class SearchPoiAdapterHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
protected TextView title;
protected Poi item;
protected IPoiListener myListener;
public SearchPoiAdapterHolder(View itemView, IPoiListener listener) {
super(itemView);
itemView.setOnClickListener(this);
title = (TextView) itemView.findViewById(R.id.title);
myListener = listener;
}
public void setItem(Poi poi) {
item = poi;
}
@Override
public void onClick(View view) {
myListener.onClickPoi(item);
}
}
@Override
public int getItemCount() {
if (mSearchings != null) {
if (mSearchings.size() == 0) {
mListener.noPoi();
}
return mSearchings.size();
}
return 0;
}
@Override
public SearchPoiAdapterHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.
from(parent.getContext()).
inflate(R.layout.search_list_item, parent, false);
return new SearchPoiAdapter.SearchPoiAdapterHolder(itemView, mListener);
}
@Override
public void onBindViewHolder(SearchPoiAdapterHolder holder, int position) {
holder.setItem(mSearchings.get(position));
holder.title.setText(mSearchings.get(position).getName());
}
public void addPoi(Poi poi) {
if (mSearchings == null) {
mSearchings = new ArrayList<>();
}
mSearchings.add(poi);
}
/**
* Sort all the Pois by their name
*/
public void sortPoi() {
if (mSearchings != null) {
Collections.sort(mSearchings, new Comparator<Object>() {
@Override
public int compare(Object obj1, Object obj2) {
if (obj1 instanceof Poi && obj2 instanceof Poi) {
Poi poiOne = (Poi) obj1;
Poi poiTwo = (Poi) obj2;
return poiOne.getName().compareToIgnoreCase(poiTwo.getName());
}
return 0;
}
});
}
}
public void updatePois(List<Poi> pPois) {
this.mSearchings = pPois;
notifyDataSetChanged();
}
public void clear() {
if (mSearchings != null) {
int size = mSearchings.size();
mSearchings.clear();
notifyItemRangeRemoved(0, size);
}
}
}
负责崩溃的代码。 Stacktrace没有引用我的代码，因此调试它真的很难。但是经过很多评论我终于找到了这个地方。
protected void updateAdapter(int filter) {
if (poiAdapter != null) {
poiAdapter.clear(); // If I comment this line, it seems I have no problem but the adapter is not cool
} else {
poiAdapter = new SearchPoiAdapter(this);
}
switch (filter) {
case RAIL_STATION : {
for (int i = 0; i < pois.size(); i++) {
if (pois.get(i).getType().equals(Constants.RAILSTATION) && !pois.get(i).hasChild()) {
poiAdapter.addPoi(pois.get(i));
}
}
list.setAdapter(poiAdapter);
poiAdapter.sortPoi();
poiAdapter.notifyDataSetChanged();
break;
}
case AIRPORT : {
for (int i = 0; i < pois.size(); i++) {
if (pois.get(i).getType().equals(Constants.AIRPORT) && !pois.get(i).hasChild()) {
poiAdapter.addPoi(pois.get(i));
}
}
list.setAdapter(poiAdapter);
poiAdapter.sortPoi();
poiAdapter.notifyDataSetChanged();
break;
}
case OTHER_POIS : { // display only parents
for (int i = 0; i < pois.size(); i++) {
if (pois.get(i).getType().equals(Constants.OTHER) && pois.get(i).hasChild()) {
poiAdapter.addPoi(pois.get(i));
}
}
list.setAdapter(poiAdapter);
poiAdapter.sortPoi();
poiAdapter.notifyDataSetChanged();
break;
}
}
emptyView.setVisibility(View.GONE);
}
当我切换到另一个poi时发生错误。我再说一遍，我对ListView的旧实现没有任何问题。
你有想法解决我的问题吗？
提前谢谢