It's a similar question to this, but the solution doesn't work.
The problem is that the scrolling of ListView is very sluggish which is because of lots and lots of GCs. I use holder pattern (view caching) as you can see in the code below:
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.eventrow, parent, false);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.eventTitle);
holder.place = (TextView) convertView.findViewById(R.id.eventPlace);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.title.setText(((EventItem) getItem(position)).getTitle());
holder.place.setText(((EventItem) getItem(position)).getPlace_name());
return convertView;
}
I removed cacheColorHint and custom selectors from my listview and from rows:
<ListView
android:id="@+id/android:list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
This is how the log looks like:
08-20 19:36:24.286: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 364K, 46% free 3944K/7239K, external 1196K/1445K, paused 54ms
08-20 19:36:24.356: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 228K, 49% free 3716K/7239K, external 1721K/1970K, paused 52ms
08-20 19:36:24.456: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 5K, 49% free 3726K/7239K, external 2214K/2463K, paused 50ms
08-20 19:36:24.546: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 2K, 49% free 3726K/7239K, external 2214K/2463K, paused 43ms
08-20 19:36:24.636: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 2K, 49% free 3726K/7239K, external 2214K/2463K, paused 44ms
08-20 19:36:24.696: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 50ms
08-20 19:36:24.766: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:24.846: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:24.906: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:24.986: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:25.056: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 47ms
08-20 19:36:25.136: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:25.196: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 46ms
08-20 19:36:25.296: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 48ms
08-20 19:36:25.356: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3726K/7239K, external 2214K/2463K, paused 43ms
08-20 19:36:34.596: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 7K, 49% free 3740K/7239K, external 2214K/2463K, paused 51ms
08-20 19:36:34.656: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed 1K, 49% free 3739K/7239K, external 2214K/2463K, paused 50ms
08-20 19:36:34.746: D/dalvikvm(12036): GC_EXTERNAL_ALLOC freed <1K, 49% free 3739K/7239K, external 2214K/2463K, paused 50ms
EDIT:
It seems that the problem appears (almost) only when the ListFragment is first inflated. For the first scroll down and then up. After that the GCs are not so often. But sometimes the GCs appear everytime I scroll. I can see no regularity here.
PLUS I can see the problem on HTC Desire (2.3.7 MIUI) but not on Sasmung Galaxy ACE (2.1). It only gets more confusing...
Not so satisfying solution: When I use
android:scrollingCache="false"
android:animationCache="false"
in my listview it seems ok. But the docs say it should be exactly otherwise if I understand well, so I'm a little bit confused.
Where do I make mistake? What to do to have a smooth scrolling listview? Or would disabling scrollingCache have some negative effect which I can't see now?