![](/img/trans.png)
[英]android.support.v7.widget.RecyclerView cannot be cast to android.widget.ListView
[英]android.support.v4.widget.NestedScrollView cannot be cast to android.support.v7.widget.RecyclerView
下午好,
我正在嘗試使用包含項目的RecyclerView創建片段。
在這些項目上方,我需要添加一些過濾器的標題。
這是片段的xml (fragment_products_list) :
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="12sp"
android:id="@+id/filters_frame">
<include layout="@layout/expandable_filters"/>
</RelativeLayout>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
這是我的Fragment Java文件(ListFragment.java)中的OnCreateView:
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
RecyclerView rv = (RecyclerView) inflater.inflate(
R.layout.fragment_products_list, container, false);
//Product filters
expandFiltersButton = (ImageButton) getView().findViewById(R.id.expand_filters);
expandableZone = (LinearLayout) getView().findViewById(R.id.expandable_zone);
expandFiltersButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(expandableZone.isShown()){
expandableZone.setVisibility(View.GONE);
expandFiltersButton.setImageResource(R.drawable.ic_more_24dp);
}else{
expandableZone.setVisibility(View.VISIBLE);
expandFiltersButton.setImageResource(R.drawable.ic_less_24dp);
}
}
});
setupRecyclerView(rv);
mRecyclerView = rv;
loadUpdates();
return rv;
}
當我嘗試運行該應用程序時出現以下錯誤代碼:
android.support.v4.widget.NestedScrollView cannot be cast to android.support.v7.widget.RecyclerView
有什么問題,我該如何解決? 謝謝你的幫助!
嘗試這個:
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(
R.layout.fragment_products_list, container, false);
//Product filters
RecyclerView rv = (RecyclerView) view.findViewById(R.id.recyclerview);
expandFiltersButton = (ImageButton) view.findViewById(R.id.expand_filters);
expandableZone = (LinearLayout) view.findViewById(R.id.expandable_zone);
expandFiltersButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
if(expandableZone.isShown()){
expandableZone.setVisibility(View.GONE);
expandFiltersButton.setImageResource(R.drawable.ic_more_24dp);
}else{
expandableZone.setVisibility(View.VISIBLE);
expandFiltersButton.setImageResource(R.drawable.ic_less_24dp);
}
}
});
setupRecyclerView(rv);
mRecyclerView = rv;
loadUpdates();
return view;
}
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