In my app I have a ListView backed by ArrayAdapter. In it I'm
detecting events in OnScrollListener#onScroll method to find end of
the list. I noticed that on the phone (MyTouch) both track-ball and
gesture/touch scrolling will trigger the event twice. On the emulator
I get the same behavior with a scrolling wheel and click-and-drug
scrolling. However in emulator if I use down-arrow button to scroll
the event is fired only once.
Here's the code:
this.view.setOnScrollListener(new OnScrollListener() {
@Override
public void onScroll(final AbsListView view, final int first,
final int visible, final int
total) {
// detect if last item is visible
if (visible < total && (first + visible == total)) {
Log.d("OnScrollListener - end of list", "fvi: " +
first + ", vic: " + visible + ", tic: " + total);
// this line gets called twice
onLastListItemDisplayed(total, visible);
}
}
}
How do I suppress or handle this behavior? I need just a single event
and trying not to revert to silly hacks such as boolean field.
As far as I can tell - both events have identical stacktrace
Thread [<3> main] (Suspended (breakpoint at line 116 in
SearchResultsView$4))
SearchResultsView$4.onScroll(AbsListView, int, int, int) line:
116
ListView(AbsListView).invokeOnItemScrollListener() line: 655
ListView.arrowScrollImpl(int) line: 2256
ListView.arrowScroll(int) line: 2172
ListView.commonKey(int, int, KeyEvent) line: 1977
ListView.onKeyMultiple(int, int, KeyEvent) line: 1929
KeyEvent.dispatch(KeyEvent$Callback) line: 899
ListView(View).dispatchKeyEvent(KeyEvent) line: 3647
ListView(ViewGroup).dispatchKeyEvent(KeyEvent) line: 744
ListView.dispatchKeyEvent(KeyEvent) line: 1909
FrameLayout(ViewGroup).dispatchKeyEvent(KeyEvent) line: 746
LinearLayout(ViewGroup).dispatchKeyEvent(KeyEvent) line: 746
PhoneWindow$DecorView(ViewGroup).dispatchKeyEvent(KeyEvent) line:
746
PhoneWindow$DecorView.superDispatchKeyEvent(KeyEvent) line: 1708
PhoneWindow.superDispatchKeyEvent(KeyEvent) line: 1197
SearchResultsView(Activity).dispatchKeyEvent(KeyEvent) line:
1967
PhoneWindow$DecorView.dispatchKeyEvent(KeyEvent) line: 1684
ViewRoot.deliverKeyEventToViewHierarchy(KeyEvent, boolean) line:
2329
ViewRoot.handleFinishedEvent(int, boolean) line: 2299
ViewRoot.handleMessage(Message) line: 1621
ViewRoot(Handler).dispatchMessage(Message) line: 99
Looper.loop() line: 123
ActivityThread.main(String[]) line: 4203
Method.invokeNative(Object, Object[], Class, Class[], Class, int,
boolean) line: not available [native method]
Method.invoke(Object, Object...) line: 521
ZygoteInit$MethodAndArgsCaller.run() line: 791
ZygoteInit.main(String[]) line: 549
NativeStart.main(String[]) line: not available [native method]
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