ArrayIndexOutOfBoundsException with custom Android Adapter for multiple views in ListView
AndroidExceptionListviewAdapterAndroid Problem Overview
I am attempting to create a custom Adapter for my ListView since each item in the list can have a different view (a link, toggle, or radio group), but when I try to run the Activity that uses the ListView I receive an error and the app stops. The application is targeted for the Android 1.6 platform.
The code:
public class MenuListAdapter extends BaseAdapter {
private static final String LOG_KEY = MenuListAdapter.class.getSimpleName();
protected List<MenuItem> list;
protected Context ctx;
protected LayoutInflater inflater;
public MenuListAdapter(Context context, List<MenuItem> objects) {
this.list = objects;
this.ctx = context;
this.inflater = (LayoutInflater)this.ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i(LOG_KEY, "Position: " + position + "; convertView = " + convertView + "; parent=" + parent);
MenuItem item = list.get(position);
Log.i(LOG_KEY, "Item=" + item );
if (convertView == null) {
convertView = this.inflater.inflate(item.getLayout(), null);
}
return convertView;
}
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public boolean isEnabled(int position) {
return true;
}
@Override
public int getCount() {
return this.list.size();
}
@Override
public MenuItem getItem(int position) {
return this.list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
Log.i(LOG_KEY, "getItemViewType: " + this.list.get(position).getLayout());
return this.list.get(position).getLayout();
}
@Override
public int getViewTypeCount() {
Log.i(LOG_KEY, "getViewTypeCount: " + this.list.size());
return this.list.size();
}
}
The error I receive:
java.lang.ArrayIndexOutOfBoundsException
at android.widget.AbsListView$RecycleBin.addScrapView(AbsListView.java:3523)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1158)
at android.widget.ListView.onMeasure(ListView.java:1060)
at android.view.View.measure(View.java:7703)
I do know that the application is returning from getView
and everything seems in order.
Any ideas on what could be causing this would be appreciated.
Thanks,
-Dan
Android Solutions
Solution 1 - Android
The item view type you are returning from
getItemViewType()
is >= getViewTypeCount()
.
Solution 2 - Android
The accepted answer is correct. This is what I am doing to avoid the problem:
public enum FoodRowType {
ONLY_ELEM,
FIRST_ELEM,
MID_ELEM,
LAST_ELEM
}
@Override
public int getViewTypeCount() {
return FoodRowType.values().length;
}
@Override
public int getItemViewType(int position) {
return rows.get(position).getViewType(); //returns one of the above types
}
Solution 3 - Android
Issue comes when getItemType value is wrong. This value should be an integer and should be from 0 to getViewTypeCount()-1.
Solution 4 - Android
The reason, is most likely because the getItemViewType method is returning the wrong values! Each row in listview is a one View. While scrooling getItemViewType reach more than View's count.
What to do? How to avoid issue?
First determine view(row) in your listview that is shown first.While Scrolling use moduler equation
@Override
public int getItemViewType(int position) {
return choseType(position);//function to use modular equation
}
@Override
public int getViewTypeCount() {
return 10;
}
In this example there is ten view(10 row).
private int choseType(int position){
if(position%10==0)
return 0;
else if(position%10==1)
return 1;
else if(position%10==2)
return 2;
else if(position%10==3)
return 3;
else if(position%10==4)
return 4;
else if(position%10==5)
return 5;
else if(position%10==6)
return 6;
else if(position%10==7)
return 7;
else if(position%10==8)
return 8;
else
return 9;
}
Important
Some users mentioned on another question on stackoverflow that method
> public int getViewTypeCount() and public int getItemViewType(int position) fix like Tooglebutton automaticly enable state check true on scrooling..that is big wrong .If you dont want automatic enbale on scrool just do
toogleButton.setChecked(false);
on getView override method.