Question

I have a ListView with a row of items, where each row contains a SeekBar and TextView. Whenever I move any of the SeekBar‘s I need to have all the TextView‘s in the ListView updated live, without losing focus on the SeekBar.

I have tried to

• call notifyDataSetChanged() on the ListView, but the
  SeekBar loses focus.

• loop through the ListView with the following code:

for (int i = 0; i < listView.getChildCount(); i++)
{
TextView tv = (TextView) listView.getChildAt(i).findViewById(R.id.textView1);
String value = getData();
tv.setText(value);
}

However, the code above doesn’t give a persistent update to the ListView, which is a problem if the user scrolls.

Any suggestions how to deal with this problem?

Answer 1

Whenever I move any of the SeekBar’s I need to have all the TextView’s
in the ListView updated live, without losing focus on the SeekBar.

What you want to do is updating the data list of the adapter without calling notifyDataSetChanged() and then also update the TextViews from the currently visible rows.

//...
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    // found is a reference to the ListView    
    int firstVisible = found.getFirstVisiblePosition();
    // first update the mData which backs the adapter               
    for (int i = 0; i < mData.size(); i++) {
          // update update update   
    }
    // update the visible rows
    for (int j = 0; j < found.getChildCount(); j++) {
           final View row = found.getChildAt(j);
           // get the position from the mData by offseting j with the firstVisible position
       ((TextView) row.findViewById(R.id.theIdOfTheTextView)).setText(mData.get(firstVisible + j));
    }
}
//...

This should offer you a smooth update.