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POANDROID : Load asynchronous pictures in listView
 

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    <p>I 'd like to display a ListView with a customized adapter (with picture and text).</p> <p>Images are loaded from distant servers, so I have decided to use AsyncTask.</p> <p>Actually, pictures are well displayed but if I scroll down quickly, a wrong picture is displayed during 1/2 secondes (after loading, correct picture appears)</p> <p>Here is my adapter's code:</p> <pre><code>public class GiAdapter extends BaseAdapter { private Context mContext; private List&lt;SiteStaff&gt; mListAppInfo; private HashMap&lt;Integer, ImageView&gt; views; private HashMap&lt;String,Bitmap&gt; oldPicts = new HashMap&lt;String,Bitmap&gt;(); private LayoutInflater mInflater; private boolean auto; private final String BUNDLE_URL = "url"; private final String BUNDLE_BM = "bm"; private final String BUNDLE_POS = "pos"; private final String BUNDLE_ID = "id"; public GiAdapter(Context context, List&lt;SiteStaff&gt; list) { mContext = context; mListAppInfo = list; views = new HashMap&lt;Integer, ImageView&gt;(); mInflater = LayoutInflater.from(mContext); } @Override public int getCount() { return mListAppInfo.size(); } @Override public Object getItem(int position) { return mListAppInfo.get(position).getId(); } @Override public long getItemId(int position) { return mListAppInfo.get(position).getId(); } @Override public View getView(int position, View convertView, ViewGroup parent) { LinearLayout layoutItem; // reuse of convertView if (convertView == null) { layoutItem = (LinearLayout) mInflater.inflate(R.layout.auto_gi, parent, false); } else { layoutItem = (LinearLayout) convertView; } // infos for the current element SiteStaff entry = mListAppInfo.get(position); //set some text fields TextView name = (TextView) layoutItem.findViewById(R.id.name); TextView size = (TextView) layoutItem.findViewById(R.id.size); name.setText(entry.getName()); size.setText(entry.getSize()); // get the imageView for the current object ImageView v = (ImageView) layoutItem.findViewById(R.id.gi_image); // put infos in bundle and send to the LoadImage class Bundle b = new Bundle(); //url of the pict b.putString(BUNDLE_URL, entry.getUrl()); //position in the listView b.putInt(BUNDLE_POS, position); //id of the current object b.putInt(BUNDLE_ID, entry.getId()); //put info in the map in order to display in the onPostExecute views.put(position, v); // thread new LoadImage().execute(b); return layoutItem; } //asyncTackClass for loadingpictures private class LoadImage extends AsyncTask&lt;Bundle, Void, Bundle&gt; { @Override protected Bundle doInBackground(Bundle... b) { Bitmap bm =null; //cache: for better performance, check if url alredy exists if(oldPicts.get(b[0].getString(BUNDLE_URL))==null){ bm = Utils.getBitMapFromUrl(b[0].getString(BUNDLE_URL)); oldPicts.put(b[0].getString(BUNDLE_URL),bm); }else{ bm = oldPicts.get(b[0].getString(BUNDLE_URL)); } // get info from bundle Bundle bundle = new Bundle(); bundle.putParcelable(BUNDLE_BM, bm); bundle.putInt(BUNDLE_POS, b[0].getInt(BUNDLE_POS)); return bundle; } @Override protected void onPostExecute(Bundle result) { super.onPostExecute(result); //get picture saved in the map + set ImageView view = views.get(result.getInt(BUNDLE_POS)); Bitmap bm = (Bitmap) result.getParcelable(BUNDLE_BM); if (bm != null){ //if bitmap exists... view.setImageBitmap(bm); }else{ //if not picture, display the default ressource view.setImageResource(R.drawable.unknow); } } } } </code></pre> <p>Thank you !</p>
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