Android ListView setSelection() does not seem to work

Question

I have a ListActivity that implements onListItemClick() and calls a doSomething() function of the class. The latter contains l.s

Answer 1

I found that sometimes setSelection will not work because I set attribute "android:height" of listView to "wrap_content".

And the times my App won't work is that when listView become scrollable from non-scrollable.

For example, if my app is "File Browser App". When my list is less than, let's say 6, then it's non-scrollable. Now I return to the parent directory, and it has 11 objects, and I want to set selection to some position, and it won't work here.

to\from    |    Scrollable  | non-Scrollable

Scrollable | O | O( of course )

non-Scrollable | X | O( of course )

I don't want to use post(Runnable), because there will has delay.

==================================

Answer:

You can try to set "android:height" to "match_parent"

God, it spends three days.

Answer 2

When use post to setSelection(), the ListView will see first , then scroll to the position , thank to "魏經軒", then layout actually will effect the setSelection(), because setSelection() call the setSelectionFromTop(int position, int y), there is another way to solve it.

listView.setAdapter(listView.getAdapter());
listView.setSelection(123);

Answer 3

In my case smoothScrollToPosition(int position) worked, can you also tell me how to set that scrolled position into center of the list. It appeared at the bottom of visible items.

Answer 4

If you use an Adapter for your ListView add this code to your adapter:

public class MyAdapter extends
        ArrayAdapter<MyClass> {


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflator = (LayoutInflater) getContext()
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            rowView = inflator.inflate(R.layout.my_adapter, null);
        } else {
            rowView = (View) convertView;
        }

        //...

        // set selected item
        LinearLayout ActiveItem = (LinearLayout) rowView;
        if (position == selectedItem)
        {
            ActiveItem
                    .setBackgroundResource(R.drawable.background_dark_blue);

            // for focus on it
            int top = (ActiveItem == null) ? 0 : ActiveItem.getTop();
            ((ListView) parent).setSelectionFromTop(position, top);
        }
        else
        {
            ActiveItem
                    .setBackgroundResource(R.drawable.border02);
        }

    }

    private int selectedItem;

    public void setSelectedItem(int position) {
        selectedItem = position;
    }

}

In your Activity:

myAdapter.setSelectedItem(1);

Answer 5

For me the solution to this problem was:

listView.clearChoices();

Answer 6

For me calling

listView.notifyDataSetChanged();
listView.requestFocusFromTouch();

and then

 listView.setSelection(position);

solved the issue.

if you do that in a runnable it works without calling requestFocusFromTouch(), but the old position of the ListView is showen for a sekound.