Listview Scroll to the end of the list after updating the list – Dev

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QUESTION:

I would like to make sure that the list is scrolled all the way to the bottom, after I have updated the listview by using listAdapter, so that it displays the last element entered in the list. How can I do this ?

I tried this but no luck:

lv.setTranscriptMode(ListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);

thank you

ANSWER:

You need to use these parameters in your list view:

  • Scroll
    lv.setTranscriptMode(ListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);

  • Set the head of the list to it bottom
    lv.setStackFromBottom(true);

You can also set these parameters in XML, eg. like this:

<ListView
   ...
   android:transcriptMode="alwaysScroll"
   android:stackFromBottom="true" />

ANSWER:

Supposing you know when the list data has changed, you can manually tell the list to scroll to the bottom by setting the list selection to the last row. Something like:

private void scrollMyListViewToBottom() {
    myListView.post(new Runnable() {
        @Override
        public void run() {
            // Select the last row so it will scroll into view...
            myListView.setSelection(myListAdapter.getCount() - 1);
        }
    });
}

ANSWER:

I’ve had success using this in response to a button click, so I guess that you can use it too after updating your contents:

myListView.smoothScrollToPosition(theListAdapter.getCount() -1);

ANSWER:

A combination of TRANSCRIPT_MODE_ALWAYS_SCROLL and setSelection made it work for me

ChatAdapter adapter = new ChatAdapter(this);

ListView lv = (ListView) findViewById(R.id.chatList);
lv.setTranscriptMode(AbsListView.TRANSCRIPT_MODE_ALWAYS_SCROLL);
lv.setAdapter(adapter);

adapter.registerDataSetObserver(new DataSetObserver() {
    @Override
    public void onChanged() {
        super.onChanged();
        lv.setSelection(adapter.getCount() - 1);    
    }
});