Recycle view - java.lang.NullPointerException

Je suis arriver exception suivante alors que je suis essayez d'afficher les recycler vue:

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.widget.RecyclerView$LayoutManager.canScrollVertically()' on a null object reference
at android.support.v7.widget.RecyclerView.computeVerticalScrollRange(RecyclerView.java:1216)
at android.view.View.onDrawScrollBars(View.java:13900)
at android.view.View.draw(View.java:16275)
at android.support.v7.widget.RecyclerView.draw(RecyclerView.java:2440)
at android.view.View.updateDisplayListIfDirty(View.java:15192)
at android.view.View.getDisplayList(View.java:15215)
at android.view.View.draw(View.java:15990)
at android.view.ViewGroup.drawChild(ViewGroup.java:3708)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3502)
at android.view.View.draw(View.java:16272)
at android.view.View.updateDisplayListIfDirty(View.java:15192)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:362)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3692)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3671)
at android.view.View.updateDisplayListIfDirty(View.java:15152)
at android.view.View.getDisplayList(View.java:15215)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:307)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:313)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:352)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2811)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2634)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2222)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1230)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6726)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:777)
at android.view.Choreographer.doCallbacks(Choreographer.java:590)
at android.view.Choreograph

et mon xml est ceci:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
style="@style/global_screen_linear_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/lilAdvancedSearchParent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/gray_general"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="10dp" >
<LinearLayout
android:id="@+id/lilAdvancedSearch"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="6"
android:gravity="center_vertical" >
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/arrow_white" />
<TextView
android:id="@+id/txvAvencedSearch"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="4.5"
android:text="@string/global_fragment_advenced_search"
android:textColor="@color/white"
android:textSize="@dimen/global_screen_layout_text_view_advenced_search"
android:textStyle="bold" />
</LinearLayout>
<EditText
android:id="@+id/edtSearch"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="9"
android:drawableLeft="@drawable/navigation_search"
android:ems="10"
android:imeOptions="actionSearch"
android:inputType="text"
android:textColor="@color/white"
android:textColorHint="@color/white"
android:textSize="15sp" >
<requestFocus />
</EditText>
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="800dp"
android:scrollbars="vertical" >
</android.support.v7.widget.RecyclerView>
</LinearLayout>

et mon code java est: est-ce

public class TendersFragment extends BaseFragment{
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.global_screen_layout, container, false);
initUI(v);
initListeners();
setEditSearchHint(getString(R.string.tenders_fragment_search_tenders));
setAdvancedSearchBackground(getResources().getColor(R.color.green_general));
return v;
}
@Override
protected void initUI(View view) {
lsvTendersJobsMessages = (ListView) view.findViewById(R.id.lsvGlobal);
mRecyclerView = (RecyclerView) view.findViewById(R.id.my_recycler_view);
setAdapterForListview(lsvTendersJobsMessages);  
edtSearch = (EditText) view.findViewById(R.id.edtSearch);
txvAdvencedSearch = (TextView) view.findViewById(R.id.txvAvencedSearch);
lilAdvancedSearch = (LinearLayout) view.findViewById(R.id.lilAdvancedSearch);       
lilAdvancedSearchParent = (LinearLayout) view.findViewById(R.id.lilAdvancedSearchParent);
}
@Override
protected void setAdapterForListview(ListView lsv) {
mRecyclerView.setHasFixedSize(true);
mLinearLayoutManager = new LinearLayoutManager(getActivity());
mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);      
mRecyclerView.setLayoutManager(mLinearLayoutManager);
ArrayList<ItemType> arlItems = new ArrayList<ItemType>();
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
arlItems.add(ItemType.MAIN_ITEM);
//specify an adapter (see also next example)
mainItemAdapter = new MainItemAdapter(arlItems, getActivity());
mRecyclerView.setAdapter(mainItemAdapter);
}
@Override
protected void onServiceConnected() {
//TODO Auto-generated method stub
}
protected void initListeners() {
final AdvancedSearchFragment advancedSearchFragment = new AdvancedSearchFragment(); 
Bundle bundle = new Bundle();       
bundle.putInt(FragmentConst.BUNDLE_KEY_INT_WHICH_FRAGMENT,FragmentConst.TENDERS_ID);    
advancedSearchFragment.setArguments(bundle);
lilAdvancedSearch.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {                   
getActivity().getSupportFragmentManager().beginTransaction()
.add(android.R.id.content,advancedSearchFragment).addToBackStack(null)
.commit();
}
});
}
}

je suis aussi essayer de mettre le layout_height de le recycler vue comme match_parent et wrap_contant mais encore, je reçois la même erreur

source d'informationauteur gil cohen

Voici comment j'ai finalement résolu ce problème.

J'ai enlevé android:scrollbars="vertical" de RecyclerView déclaration:

<android.support.v7.widget.RecyclerView
android:id="@+id/task_recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

9

Supprimer cette ligne du xml:

android:scrollbars="vertical"

Je pense que vous devez initialisé RecyclerView dans du code java lien ce

//1. get a reference to recyclerView 
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
//2. set layoutManger
recyclerView.setLayoutManager(new LinearLayoutManager(this));
//3. create an adapter 
MyAdapter mAdapter = new MyAdapter(itemsData);
//4. set adapter
recyclerView.setAdapter(mAdapter);

2

Ne vous déclarer recyclerView dans tout fichier de mise en page qui u n'ont pas traité avec java contrôleur (Activité/Fragment) ?

Je déclare deux recycleur de mise en page en deux fragments, j'ai procédé de la 1ère société de recyclage de mes codes java, n'ont pas traité avec la 2e. Après je supprime le recyclerView déclaration fragment2-mise en page-fichier, il a résolu le problème de pointeur null.

Remplacer

mLinearLayoutManager = new LinearLayoutManager(getActivity());
mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);   
mRecyclerView.setLayoutManager(mLinearLayoutManager);

avec

final LinearLayoutManager mLayoutManager= new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, true);            
mRecyclerView.setLayoutManager(mLayoutManager);

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