Styjun

From firbase, I saw a lot of crash logs:

Fatal Exception: java.lang.IndexOutOfBoundsException
Invalid index 7, size is 0
java.util.ArrayList.throwIndexOutOfBoundsException (ArrayList.java:255)
java.util.ArrayList.get (ArrayList.java:308)
com.weex.app.adapters.CartoonReaderAdapter.getItemViewType (CartoonReaderAdapter.java:357)
android.widget.AbsListView$RecycleBin.getScrapView (AbsListView.java:7132)
android.widget.AbsListView.obtainView (AbsListView.java:2469)
android.widget.ListView.makeAndAddView (ListView.java:1920)
android.widget.ListView.fillUp (ListView.java:751)
android.widget.ListView.fillGap (ListView.java:690)
android.widget.AbsListView.trackMotionScroll (AbsListView.java:5579)
android.widget.AbsListView.scrollIfNeeded (AbsListView.java:3641)
android.widget.AbsListView.startScrollIfNeeded (AbsListView.java:3569)
android.widget.AbsListView.onInterceptTouchEvent (AbsListView.java:4711)
android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2157)

it seems adapter.getItemViewType throw IndexOutOfBoundsException while flinging. I've checked my code, all notifyDataSetChanged is called in main thread. Here is my adapter code:

@Override
 public void notifyDataSetChanged() 
 Log.e("TAG","notify data change:"+Thread.currentThread().getName());
 rebuildViewTypes();
 super.notifyDataSetChanged();
 

 @Override
 public int getCount() 
 return viewTypes == null ? 0 : viewTypes.size();
 

 private void rebuildViewTypes() 
 viewTypes.clear();
 if (pictures == null 

 @Override
 public Object getItem(int position) 
 CartoonReaderTypeItem item = viewTypes.get(position);
 return item.item;
 

 @Override
 public long getItemId(int position) 
 return 0;
 

 @Override
 public int getViewTypeCount() 
 return 16;
 

 /**
 * @param position
 * @return
 */
 @Override
 public int getItemViewType(int position) 
 CartoonReaderTypeItem item = viewTypes.get(position);
 return item.type;
 

I'm confused. All the methods(dispatchTouchEvent& notifyDataSetChanged) should be called in main thread. So there's not thread safety problem. The viewTypes data may be safe. The IndexOutOfBoundsException is beyond my understanding.

Any idea please?

Index is starting with 0. In below code your position might be +1 higher than index of the array. So please check the position value.

 public int getItemViewType(int position) 
 
 CartoonReaderTypeItem item = viewTypes.get(position);
 return item.type;
 

try this might help -

 @Override
 public int getItemId(int position) 
 return position;
 

@Override
public int getViewTypeCount() 
 return viewTypes.size();