Пользовательские панели навигации ArrayIndefOutOfBounds

Question

Я реализовал навигационный ящик адаптера, я хотел посмотреть некоторые вещи, как это:

1. Заголовок
2. Элемент списка
3. пункт Список
4. TextView

Но Я получил ошибки, я не знаю, почему используется «если». Когда я удаляю макет строки и только header.xml и drawer_list_item.xml, он работает. Я просто учился, чтобы ты помог мне?

java.lang.ArrayIndexOutOfBoundsException: length=0; index=0 
     at com.example.test.adapters.NavDrawerAdapter.onBindViewHolder(NavDrawerAdapter.java:182) 
     at com.example.test.adapters.NavDrawerAdapter.onBindViewHolder(NavDrawerAdapter.java:31) 
     at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:4138) 
     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3448) 
     at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:3340) 
     at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1810) 
     at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1306) 
     at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1269) 
     at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:523) 
     at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1988) 
     at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2237) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:931) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
     at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703) 
     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557) 
     at android.widget.LinearLayout.onLayout(LinearLayout.java:1466) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
     at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703) 
     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557) 
     at android.widget.LinearLayout.onLayout(LinearLayout.java:1466) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573) 
     at android.widget.FrameLayout.onLayout(FrameLayout.java:508) 
     at android.view.View.layout(View.java:15684) 
     at android.view.ViewGroup.layout(ViewGroup.java:4981) 
     at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2186) 
     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1920) 
     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1106) 
     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6018) 
     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:792) 
     at android.view.Choreographer.doCallbacks(Choreographer.java:596) 
     at android.view.Choreographer.doFrame(Choreographer.java:557) 
     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:778) 
     at android.os.Handler.handleCallback(Handler.java:739) 
     at android.os.Handler.dispatchMessage(Handler.java:95) 
     at android.os.Looper.loop(Looper.java:155) 
     at android.app.ActivityThread.main(ActivityThread.java:5696) 
     at java.lang.reflect.Method.invoke(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:372) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823) 

Это мой адаптер

public class NavDrawerAdapter extends RecyclerView.Adapter<NavDrawerAdapter.ViewHolder> { 

    private static final int TYPE_HEADER = 0; 
    private static final int TYPE_ITEM = 1; 
    private static final int TYPE_LINE = 2; 


    private String mNavTitles[]; 
    private Integer mNavTitlesId[]; 

    private String name; 
    private String email; 
    Context context; 

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ 
     int Holderid; 

     TextView textView; 
     ImageView mHashImageView; 
     ImageView profile; 
     TextView Name; 
     TextView email; 
     Context mContext; 
     String mTitles[]; 
     Integer mTitlesId[]; 
     TextView mLine; 

     public ViewHolder(View itemView,int ViewType, Context context) {     // Creating ViewHolder Constructor with View and viewType As a parameter 
      super(itemView); 
      mContext = context; 
      itemView.setClickable(true); 
      itemView.setOnClickListener(this); 


      if(ViewType == TYPE_ITEM) { 
       textView = (TextView) itemView.findViewById(R.id.hashTextView) 
       mHashImageView = (ImageView) itemView.findViewById(R.id.hashImageView); 
       Holderid = 1; 
      } else if(ViewType == TYPE_HEADER) { 
       Name = (TextView) itemView.findViewById(R.id.name); 
       email = (TextView) itemView.findViewById(R.id.email); 
       profile = (ImageView) itemView.findViewById(R.id.circleView); 
       Holderid = 0; 
      } else if(ViewType == TYPE_LINE){ 
       mLine = (TextView) itemView.findViewById(R.id.lineTextView); 
       Holderid = 2; 
      } 
     } 

     @Override 
     public void onClick(View v) { 
      Toast.makeText(mContext, "The Item Clicked is: " + getPosition(), Toast.LENGTH_SHORT).show(); 
     } 
    } 

    public NavDrawerAdapter(String Name, String Email, Context context, String[] mTitles, int[] mTitlesId){ 
     name = Name; 
     email = Email; 
     this.context = context; 

     mNavTitles = mTitles; 
     mNavTitlesId = mTitlesId; 
    } 

    @Override 
    public NavDrawerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

     if (viewType == TYPE_ITEM) { 
      View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.drawer_list_item,parent,false); 

      ViewHolder vhItem = new ViewHolder(v,viewType,context); 

      return vhItem; 

     } else if (viewType == TYPE_HEADER) { 

      View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,parent,false); 

      ViewHolder vhHeader = new ViewHolder(v,viewType,context); 

      return vhHeader; 


     } else if(viewType == TYPE_LINE) { 
      View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.line,parent,false); 

      ViewHolder vhLine = new ViewHolder(v,viewType,context); 

      return vhLine; 
     } 
     return null; 

    } 

    @Override 
    public void onBindViewHolder(NavDrawerAdapter.ViewHolder holder, int position) { 
     if(holder.Holderid == 1) { 
      holder.textView.setText(mNavTitles[position - 1]); 
     } 
     else if(holder.Holderid == 0){ 
      holder.Name.setText(name); 
      holder.email.setText(email); 
     } else { 
      holder.mLine.setText("Text"); 
     } 
    } 

    @Override 
    public int getItemCount() { 
     return mNavTitles.length+2; // the number of items in the list will be +1 the titles including the header view. 
    } 

    @Override 
    public int getItemViewType(int position) { 
     if (position == 0) 
      return TYPE_HEADER; 
     else if (position == 1) 
      return TYPE_ITEM; 
     return TYPE_LINE; 
    } 

} 

Я использую его в MainActivity:

mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView); // Assigning the RecyclerView Object to the xml View 
mRecyclerView.setHasFixedSize(true);       // Letting the system know that the list objects are of fixed size 

mAdapter = new NavDrawerAdapter(NAME, EMAIL, PROFILE, this.getApplicationContext()); 
mRecyclerView.setAdapter(mAdapter);        // Setting the adapter to RecyclerView 
mLayoutManager = new LinearLayoutManager(this);     // Creating a layout Manager 
mRecyclerView.setLayoutManager(mLayoutManager);     // Setting the layout Manager 

mDrawerLayout = (DrawerLayout) findViewById(R.id.DrawerLayout);  // mDrawerLayout object Assigned to the view 
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open_drawer, R.string.close_drawer) { 

    @Override 
    public void onDrawerOpened(View drawerView) { 
     super.onDrawerOpened(drawerView); 
    } 

    @Override 
    public void onDrawerClosed(View drawerView) { 
     super.onDrawerClosed(drawerView); 
    } 

}; // mDrawerLayout Toggle Object Made 
mDrawerLayout.setDrawerListener(mDrawerToggle); // mDrawerLayout Listener set to the mDrawerLayout toggle 
mDrawerToggle.syncState();  

Это header.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="178dp" 
    android:background="@drawable/background_night_sky" 
    android:orientation="vertical"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="56dp" 
     android:orientation="vertical" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true"> 

     <TextView 
      android:id="@+id/name" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="16dp" 
      android:textColor="#ffffff" 
      android:text="Name Surname" 
      android:textSize="14sp" 
      android:textStyle="bold" 

      /> 

     <TextView 
      android:id="@+id/email" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:textColor="#ffffff" 
      android:layout_marginLeft="16dp" 
      android:layout_marginTop="5dp" 
      android:text="name.surname@gmail.com" 
      android:textSize="14sp" 
      android:textStyle="normal" 

      /> 
    </LinearLayout> 

    <de.hdodenhof.circleimageview.CircleImageView 
     android:layout_width="70dp" 
     android:layout_height="70dp" 
     android:src="@drawable/avatar_small" 
     android:layout_marginLeft="16dp" 
     android:layout_marginTop="38dp" 
     android:id="@+id/circleView" 
     /> 
</RelativeLayout> 

это line.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textAppearance="?android:attr/textAppearanceSmall" 
     android:text="Small Text" 
     android:id="@+id/lineTextView" 
     android:layout_gravity="center_horizontal" 
     android:background="@color/colorPrimary"/> 
</LinearLayout> 

это drawer_list_item.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:paddingTop="4dp" 
    android:paddingBottom="4dp" 
    android:orientation="horizontal" 
    android:clickable="true" 
    android:background="?attr/selectableItemBackground"> 

    <ImageView 
     android:layout_width="@dimen/hash_size_y" 
     android:layout_height="@dimen/hash_size_x" 
     android:scaleType="fitCenter" 
     android:layout_marginStart="8dp" 
     android:layout_alignParentStart="true" 
     android:id="@+id/hashImageView" 
     android:src="@drawable/ic_hash_orange_small"/> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:paddingLeft="8dp" 
     android:layout_centerVertical="true" 
     android:textAppearance="?android:attr/textAppearanceMedium" 
     android:text="HashTag" 
     android:id="@+id/hashTextView" 
     android:textColor="@color/drawer_background" 
     android:textStyle="bold|italic" 
     android:layout_toEndOf="@id/hashImageView"/> 

</RelativeLayout> 

Answer 1

@Override 
public void onBindViewHolder(NavDrawerAdapter.ViewHolder holder, int position) { 
    if(holder.Holderid == 1) { 
     holder.textView.setText(mNavTitles[position - 1]); 
    } 
    else if(holder.Holderid == 0){ 
     holder.Name.setText(name); 
     holder.email.setText(email); 
    } else { 
     holder.mLine.setText("Text"); 
    } 
} 

@Override 
public int getItemCount() { 
    return mNavTitles.length+2; // the number of items in the list will be +1 the titles including the header view. 
} 

проблема заключается в строках выше. Вы возвращаетесь mNavTitles.length+2. Когда массив пуст, вы возвращаете 2, что означает, что onBindViewHolde будет вызываться с положением 0 и 1. В позиции 1 вы получаете доступ к массиву, который содержит что-либо, что вызывает ArrayIndexOutBoundException. Вероятно, вы хотите вернуть mNavTitles.length+1