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POManipulating a ListView's items contained in a ViewHolder - Unexpected behaviour
 

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    <p>I am experiencing some weird behaviour in my code you'll find below. I have a button in each row of my <code>ListView</code> and if it is clicked, I want to gray out the row and hide the button. To make the change permanent I have set a property in the custom <code>ViewHolder</code> so the changes are persistent.</p> <p>However, clicking the button on, say item 1, will also apply the changes to item 6. On other items it affects no other row or it affects more than one row. I suspect it has something to do with me declaring some <code>final</code> variables but I cannot be sure. I tried implementing different solutions (reducing the number of final variables, using different variables, ect) but nothing really seems to work.</p> <p>I am in need of some assistance. Thank you!</p> <pre><code>public class FruitLoopsAdapter extends BaseAdapter { private ArrayList&lt;FruitLoopsNode&gt; provider; private Activity parent; /** * Constructor. * @param parent * The parent activity of the fragment using the FruitLoop. Needed as the adapter will * be used in a fragment which only its parents has access to the data providers. */ public FruitLoopsAdapter(Activity parent) { this.parent = parent; provider = ((Box)parent).getFruitLoops(); } /** * Method returning the size of the underlying data provider. * @return * The size of the data provider. * @see android.widget.Adapter#getCount() */ @Override public int getCount() { return provider.size(); } /**{@inheritDoc}*/ @Override public Object getItem(int position) { return provider.get(position); } /**{@inheritDoc}*/ @Override public long getItemId(int position) { return position; } /** * Method building the composite custom view and returning it as one view. * @see android.widget.Adapter#getView(int, android.view.View, android.view.ViewGroup) */ @Override public View getView(int position, View convertView, ViewGroup parentViewGroup) { FruitLoopsViewHolder viewHolder; final FruitLoopsNode FruitLoopsNode = provider.get(position); if (convertView == null) { convertView = LayoutInflater.from(parentViewGroup.getContext()).inflate(R.layout.list_FruitLoops, null); viewHolder = new FruitLoopsViewHolder( (TextView) convertView.findViewById(R.id.time), (Button) convertView.findViewById(R.id.consume), (ImageView) convertView.findViewById(R.id.thumbnail), (TextView) convertView.findViewById(R.id.content_title), (TextView) convertView.findViewById(R.id.content_brief), (RatingBar) convertView.findViewById(R.id.ratingBar)); convertView.setTag(viewHolder); } else { viewHolder = (FruitLoopsViewHolder) convertView.getTag(); determinePresentationMode(convertView, viewHolder); } /** [Omitted some code setting many of the fields above to] */ final Button button = viewHolder.getButton(); final View finalConvertView = convertView; button.setOnClickListener(new OnClickListener() { public void onClick(View view) { button.setEnabled(false); button.setVisibility(View.INVISIBLE); finalConvertView.setAlpha(0.5f); finalConvertView.setBackgroundColor(Color.GRAY); } }); /** * As using a final viewHolder to set the value inside the onClick() method of the * button will cause the images not to update anymore, investigating the alpha value * of the convertView seemed the only easy way to get there. Also, as it is a float, * I want to leave a bit of extra padding in the test. */ if(finalConvertView.getAlpha() &lt; 0.9) { viewHolder.setConsumed(true); } return convertView; } private void determinePresentationMode(View convertView, FruitLoopsViewHolder viewHolder) { if(viewHolder.wasConsumed()) { convertView.setAlpha(0.5f); convertView.setBackgroundColor(Color.GRAY); } } } </code></pre>
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