setFastScrollEnabled works fine on all my phones and crashes on Honeycomb tablet

Question

I recently get a Xoom and I am currently working on improving my apps for HoneyComb tablets. Everything is fine and my last issue concern a ListView with a FastScroll into a TabActavity.

this.setListAdapter(mIndexAdapter);
ListView lv = getListView();
lv.setTextFilterEnabled(true);
//lv.setFastScrollEnabled(true);

This code is working fine on all phones since 2 years and I am now having an issue with setFastScrollEnabled! As you can see on my snippet, I had to remove this line or I get this exception (see below)

Any idea on what is the problem? The only workaround I found was that:

    if(android.os.Build.VERSION.SDK_INT<11)
        lv.setFastScrollEnabled(true);

I can post my adapter, but I really don't think that's related.

06-13 13:24:50.520: INFO/ActivityManager(151): Starting: Intent { cmp=tof.cv.mpp/tof.cv.ui.BETrainsTabActivity } from pid 2327
06-13 13:24:50.620: DEBUG/dalvikvm(2327): GC_CONCURRENT freed 203K, 5% free 7383K/7751K, paused 2ms+3ms
06-13 13:24:50.700: DEBUG/AndroidRuntime(2327): Shutting down VM
06-13 13:24:50.700: WARN/dalvikvm(2327): threadid=1: thread exiting with uncaught exception (group=0x40110760)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327): FATAL EXCEPTION: main
06-13 13:24:50.700: ERROR/AndroidRuntime(2327): java.lang.NullPointerException
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FastScroller.getThumbPositionForListPosition(FastScroller.java:612)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FastScroller.onScroll(FastScroller.java:421)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java:1252)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.ListView.layoutChildren(ListView.java:1689)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.AbsListView.onLayout(AbsListView.java:1800)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1542)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1403)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1314)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1542)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1403)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1314)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1542)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1403)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1314)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1542)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1403)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.LinearLayout.onLayout(LinearLayout.java:1314)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.widget.FrameLayout.onLayout(FrameLayout.java:400)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.View.layout(View.java:9581)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewGroup.layout(ViewGroup.java:3877)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewRoot.performTraversals(ViewRoot.java:1253)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.view.ViewRoot.handleMessage(ViewRoot.java:2003)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.os.Looper.loop(Looper.java:132)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at android.app.ActivityThread.main(ActivityThread.java:4025)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at java.lang.reflect.Method.invokeNative(Native Method)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at java.lang.reflect.Method.invoke(Method.java:491)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
06-13 13:24:50.700: ERROR/AndroidRuntime(2327):     at dalvik.system.NativeStart.main(Native Method)
06-13 13:24:50.710: WARN/ActivityManager(151):   Force finishing activity tof.cv.mpp/tof.cv.ui.BETrainsTabActivity

Answer 1

I've seen that error reported multiple times on Android 3.1 as well as 3.0.1 (at FastScroller.java:609) Something that worked before with Fast Scroller isn't anymore.

Answer 2

I see this if I return null from the getSections() method. Changing it to return an empty array instead works (new String[0]). However, the fast scrolling does not work in that case like it does on the phones.