android - Indexoutofboundsexception with listview

Question

I just got a strange indexoutofboundsexception that I can't seem to reproduce. It seems to be related to my listactivity:

java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
at java.util.ArrayList.get(ArrayList.java:311)
at android.widget.HeaderViewListAdapter.getView(HeaderViewListAdapter.java:229)
at android.widget.AbsListView.obtainView(AbsListView.java:1410)
at android.widget.ListView.makeAndAddView(ListView.java:1802)
at android.widget.ListView.fillDown(ListView.java:727)
at android.widget.ListView.fillSpecific(ListView.java:1359)
at android.widget.ListView.layoutChildren(ListView.java:1633)
at android.widget.AbsListView.onLayout(AbsListView.java:1263)
at android.view.View.layout(View.java:7088)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.widget.FrameLayout.onLayout(FrameLayout.java:334)
at android.view.View.layout(View.java:7088)
at android.view.ViewRoot.performTraversals(ViewRoot.java:1056)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1752)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at dalvik.system.NativeStart.main(Native Method)

I'm thinking it might be related to how I add/remove my footerview. Here is the code for that:

private void setLoadMoreFooter() {
    resumeProgressBarAnimation(progressbar);
    if (getListView().getFooterViewsCount() != 0 || currentCategory == null) {
        try {
            getListView().removeFooterView(footerView);
        } catch (ClassCastException e) {
        }
    }
    cursor = getVouchersFromDatabase();
    Log.d(TAG, "Determining FOOTER status:
Current page size: " + cursor.getCount()%10 + "
Current category: " + currentCategory + "
Page: " + currentCategory.getPage());
    // Add footer if there are 10 vouchers on the current page
    if (cursor.getCount()%10 == 0 && currentCategory != null) {
        getListView().addFooterView(footerView, null, true);
    }
    else if (currentCategory.getPage() >= 2 && cursor.getCount()%10 != 0) {
        getListView().addFooterView(footerView, null, false);
    }
}

Looking through the source code, the error seems to be thrown in the headerviewlistadapter's getview method at this line:

return mHeaderViewInfos.get(position).view;

Does anyone know what the cause of this might be?

Answer 1

I solve this problem by make sure notify adapter when data set is changed. In my case,data was changed by another thread,after listview check if data was right. After look into listview source. I fount the exception throw out here:

    public View More ...getView(int position, View convertView, ViewGroup parent) {
    // Header (negative positions will throw an ArrayIndexOutOfBoundsException)
    int numHeaders = getHeadersCount();
    if (position < numHeaders) {
        return mHeaderViewInfos.get(position).view;
    }

    // Adapter
    final int adjPosition = position - numHeaders;
    int adapterCount = 0;
    if (mAdapter != null) {
        adapterCount = mAdapter.getCount();
        if (adjPosition < adapterCount) {
            return mAdapter.getView(adjPosition, convertView, parent);
        }
    }

    // Footer (off-limits positions will throw an ArrayIndexOutOfBoundsException)
    return mFooterViewInfos.get(adjPosition - adapterCount).view;
}

So you can see that mFooterViewInfos.get(adjPosition - adapterCount).view throw a Indexoutofboundsexception. Because the position is larger than listview thought it will be.

What you have to do is find out which view cause this exception. And make sure once the data is changed notify the adapter immediately!