[android-developers] Re: listview adapter. Recycle bitmap

You should look into Romain Guy's 2009/10 Google I/O presentations on
UI -- he is the whip with ListViews/UI.
If you're looking for what I think you're looking to do -- which is
speed up that list view -- he has a view holder pattern that will do
just that.

Peace,
Dan

On Oct 16, 10:08 pm, Studio LFP <studio....@gmail.com> wrote:
> Based on the code there, you wouldn't have the chance to recycle the bitmap
> as you don't keep a handle to it anywhere.
>
> Then again, if the ListView discards that particular row and you aren't
> retaining any handles to the bitmap, then the bitmap should be scheduled for
> collection by the GC. If you did try to retrieve the view that was holding
> the image from the ListView and it did return it to you, there is a good
> chance the ListView still wants to use it and you would not want to release
> the bitmap.
>
> Is there a reason you are wanting to try to recycle the bitmap?
>
> Also, we are talking about the recycle() function on bitmap and not reusing
> the same bitmap, correct?
>
> Steven
> Studio LFPhttp://www.studio-lfp.com
>
>
>
>
>
>
>
> On Sunday, October 16, 2011 4:14:48 AM UTC-5, emanuele wrote:
>
> > Hello guys.. that s my baseAdapter getview implmentation:
>
> > @Override
> > public View getView(int position, View convertView, ViewGroup parent)
> > {
>
> > int type = getItemViewType(position);
> > if (convertView == null) {
> > switch (type) {
> > case TYPE_BIG_NEWS:
> > convertView = mInflater.inflate(R.layout.big_news, null);
> > break;
> > case TYPE_NORMAL_NEWS:
> > convertView = mInflater.inflate(R.layout.normal_news, null);
> > break;
> > default:
> > break;
> > }
> > }
>
> > ImageView thumb = (ImageView)
> > convertView.findViewById(R.id.thumbId);
>
> > File f = null;
> > if (filename != null)
> > f = mFileCache.getFile(i.newsKey, filename);
> > if (f == null) {
> > if (mGetThumbsThread != null && filename != null) {
> > Log.i(TAG, "cache miss");
> > thumbLinks.offer(new ThumbRequest(i.newsKey, i.thumbLink,
> > i.thumbName));
> > mGetThumbsThread.signal();
> > }
> > thumb.setImageResource(placeHolder);
> > } else {
> > Log.i(TAG,
> > "file bitmap cached: " + f.getName() + " size: " + f.length() /
> > 1024);
> > bitmap = BitmapFactory.decodeFile(f.getAbsolutePath());
> > thumb.setImageBitmap(bitmap);
> > }
>
> > return convertView;
> > }
>
> > Every row is compound of text and an ImageView. Is there any chance to
> > recycle the bitmap I use in the getView?

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