Just made the changes, the behavior is identical... this is my updated
code, feel free to make sure I made all changes:
public String[] strings = { "What","the","devil","is","happening?" };
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.listview);
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setAdapter(new
ArrayAdapter<String>(this,R.layout.main,strings));
getListView().setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2,
long arg3) {
// Log.d("test","Checked: "+
((TextView)getListView().getChildAt(arg2)).getText().toString());
if (getListView().isItemChecked(arg2))
{
for (int i=0;
i<getListView().getChildCount(); i++)
{
if
(getListView().getFirstVisiblePosition()+i==arg2)
getListView().getChildAt(i).setBackgroundColor(Color.MAGENTA);
else
getListView().getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
}
}
else
getListView().getChildAt(arg2-
getListView().getFirstVisiblePosition()).setBackgroundColor(Color.TRANSPARENT);
}
});
}
On Oct 22, 8:45 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> Ok so the issue is what I noticed: you are mixing index and positions.
> A ListView contains only as many items as it needs to fill the screen.
> For instance, you can see 8 items on screens, there are 8 children in
> the ListView, numbered from 0 to 7 (the index.) However, your adapter
> can have many more items, for instance 400. The position (arg2 in your
> code) indicates the index of an item *in the adapter*. This means that
> the View of index 2 is not necessarily the adapter's item of position
> 2. To do the conversion, you can use
> ListView.getFirstVisiblePosition().
>
> Here is your code with the fix:
>
> if (i==arg2) becomes if (getListView().getFirstVisiblePosition() + i == arg2)
> and all the getChildAt(arg2) become getChildAt(arg2 -
> getListView().getFirstVisiblePosition())
>
>
>
> On Wed, Oct 22, 2008 at 8:20 PM, kingkung <[EMAIL PROTECTED]> wrote:
>
> > I just sent you an email explaining the problem to your google
> > account. :)
>
> > On Oct 22, 7:51 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> >> Could you please explain what you are witnessing? (I work on ListView,
> >> I'd like to help... :)
>
> >> There's another issue in your code. In the for loop, you are comparing
> >> a position (arg2) with an index (i). These are different and mixing
> >> them will cause tons of "weird" issues.
>
> >> On Wed, Oct 22, 2008 at 7:49 PM, kingkung <[EMAIL PROTECTED]> wrote:
>
> >> > I kind of wanted people to try it and find out :) I can try that, but
> >> > it doesn't look like it's a race condition (like something gets called
> >> > too early or something) of any kind... it's a very distinct pattern of
> >> > behavior that's happening, though it's not what I would consider the
> >> > expected behavior...
>
> >> > On Oct 22, 7:40 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> >> >> You haven't explained what the crazy behavior is :) My bet is that you
> >> >> call isChecked() too early. Try to postpone everything you do in the
> >> >> OnItemClickListener by posting a Runnable into a Handler (or with
> >> >> getListView().post()).
>
> >> >> On Wed, Oct 22, 2008 at 7:31 PM, kingkung <[EMAIL PROTECTED]> wrote:
>
> >> >> > I wrote a small activity which illustrates some crazy behavior I found
> >> >> > while implementing ListView and choices. Feel free to plug this in
> >> >> > and try it yourselves (and be sure to check logcat as well):
>
> >> >> > public class TestActivity extends ListActivity {
>
> >> >> > public String[] strings = {
> >> >> > "What","the","devil","is","happening?" };
>
> >> >> > [EMAIL PROTECTED]
> >> >> > public void onCreate(Bundle icicle) {
> >> >> > super.onCreate(icicle);
> >> >> > setContentView(R.layout.listview);
> >> >> > getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
> >> >> > getListView().setAdapter(new
> >> >> > ArrayAdapter<String>(this,R.layout.main,strings));
> >> >> > getListView().setOnItemClickListener(new OnItemClickListener()
> >> >> > {
> >> >> > public void onItemClick(AdapterView<?> arg0,
> >> >> > View arg1, int arg2,
> >> >> > long arg3) {
> >> >> > Log.d("test","Checked: "+
> >> >> > ((TextView)getListView().getChildAt(arg2)).getText().toString());
> >> >> > if
> >> >> > (getListView().isItemChecked(arg2))
> >> >> > {
> >> >> > for (int i=0;
> >> >> > i<getListView().getChildCount(); i++)
> >> >> > {
> >> >> > if (i==arg2)
> >> >> >
> >> >> > getListView().getChildAt(i).setBackgroundColor(Color.MAGENTA);
> >> >> > else
>
> >> >> > getListView().getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
> >> >> > }
> >> >> > }
> >> >> > else
>
> >> >> > getListView().getChildAt(arg2).setBackgroundColor(Color.TRANSPARENT);
>
> >> >> > }
> >> >> > });
> >> >> > }
> >> >> > }
>
> >> >> > The R.layout.main is just your standard default TextView when you
> >> >> > create a new project in Eclipse. The R.layout.listview is the
> >> >> > standard LinearLayout with embedded ListView for ListActivities shown
> >> >> > below:
>
> >> >> > <?xml version="1.0" encoding="utf-8"?>
> >> >> > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/
> >> >> > android"
> >> >> > android:layout_width="fill_parent"
> >> >> > android:layout_height="fill_parent"
> >> >> > android:orientation="vertical"
>
> >> >> > <ListView android:id="@+id/android:list"
> >> >> > android:layout_width="fill_parent"
> >> >> > android:layout_height="wrap_content"
> >> >> > />
> >> >> > </LinearLayout>
>
> >> >> > Can anyone explain rationally what is causing this to happen?
>
> >> >> --
> >> >> Romain Guywww.curious-creature.org
>
> >> --
> >> Romain Guywww.curious-creature.org
>
> --
> Romain Guywww.curious-creature.org
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