> There's not a default number of views created for an adapter. A list
> creates as many views as it needs to fill the screen. Views get reused
> only when you start scrolling or when the adapter send a
> notifyDatasetChanged(). You say you have a thread updating the data,
> what is exactly that thread doing? Please show code.
Here is some code. Perhaps it will help.
********** the worker thread ***************
--------------------------------------
class IconLoaderThread extends Thread {
List<ObjectToShow> appList;
void loadAllResources(List<ObjectToShow> appList) {
this.appList = appList;
start();
}
public void run() {
int maxSize;
for (int i = 0; i < maxSize; i++) {
ObjectToShow appInfo = appList.get(i);
// network access occurs here
Bitmap icon = appQuery.lookupAppIcon(appInfo);
Message msg =
handler.obtainMessage(MSG_REFRESH_APP_ICON);
Bundle data = new Bundle();
data.putString("s3ObjectKey",
appInfo.getS3ObjectKey());
msg.obj = icon;
msg.setData(data);
handler.sendMessage(msg);
}
Message doneMsg = handler.obtainMessage(MSG_ICONS_DONE);
handler.sendMessage(doneMsg);
}
}
********** the handler ***************
--------------------------------------
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
ObjectToShow appInfo;
switch (msg.what) {
case MSG_INIT_APP_LIST:
initProgressBar();
handler.sendEmptyMessage(MSG_NEXT_LOAD_STEP);
break;
case MSG_REFRESH_APP_ICON:
Bitmap icon = (Bitmap)msg.obj;
String s3ObjectKey =
msg.getData().getString("s3ObjectKey");
if(icon == null || s3ObjectKey == null) {
Log.w(TAG, "Error loading icon");
} else {
efficientAdapter.updateAppInfoIcon(s3ObjectKey, icon);
}
break;
case MSG_REFRESH_APP_METADATA:
appInfo = (ObjectToShow)msg.obj;
if(appInfo == null) {
Log.w(TAG, "Error loading icon");
} else {
efficientAdapter.updateAppInfoMetadata(appInfo);
}
break;
case MSG_METADATA_DONE:
metadataLoaded = true;
handler.sendEmptyMessage(MSG_NEXT_LOAD_STEP);
break;
case MSG_ICONS_DONE:
iconsLoaded = true;
handler.sendEmptyMessage(MSG_NEXT_LOAD_STEP);
break;
case MSG_NEXT_LOAD_STEP:
if (metadataLoaded && iconsLoaded) {
doneLoadingMetadata();
}
else if (metadataLoaded || iconsLoaded) {
if (firstRun) {
// Set the adapter here.
firstRun = false;
appListView.setAdapter(efficientAdapter);
dismissLoadingMessage();
}
initIconThread();
}
else {
initMetadataThread();
}
break;
default:
break;
}
}
};
********** the adapter ***************
--------------------------------------
class EfficientAdapter extends BaseAdapter {
private List<ObjectToShow> appLocalList;
// IndexedObjectToShow just adds the int positions associated
with
the item in the ListView
private Map<String, IndexedObjectToShow> appLocalMap;
private Map<String, Bitmap> iconMap =
Collections.synchronizedMap
(new HashMap<String, Bitmap>());
AppInfoComparator appInfoComparator = new AppInfoComparator();
public void initList(List<ObjectToShow> appList) {
if (appList != null) {
appLocalList =
Collections.synchronizedList(appList);
Collections.sort(appLocalList,
appInfoComparator);
appLocalMap = new TreeMap<String,
IndexedObjectToShow>();
Iterator<ObjectToShow> iter =
appLocalList.iterator();
int i = 0;
while (iter.hasNext()) {
ObjectToShow thisInfo = iter.next();
appLocalMap.put(thisInfo.getS3ObjectKey(), new IndexedObjectToShow
(i, thisInfo));
i++;
}
appLocalMap =
Collections.synchronizedMap(appLocalMap);
}
}
public long getItemId(int position) {
int maxSize = appLocalList.size();
if( (position < 0) || (position >= maxSize)) {
Log.w(TAG, "Position out of bounds in List
Adapter");
return -1;
}
return
appLocalMap.get(appLocalList.get(position).getS3ObjectKey
()).index;
}
public EfficientAdapter(Context c, List<ObjectToShow> appList) {
if (appList != null) {
// Just refresh the list
appLocalList = appList;
Collections.sort(appLocalList,
appInfoComparator);
appLocalMap = new TreeMap<String,
IndexedObjectToShow>();
Iterator<ObjectToShow> iter =
appLocalList.iterator();
int i = 0;
while (iter.hasNext()) {
ObjectToShow thisInfo = iter.next();
appLocalMap.put(thisInfo.getS3ObjectKey(), new IndexedObjectToShow
(i, thisInfo));
i++;
}
}
}
public int getCount() {
return appLocalList.size();
}
public List<ObjectToShow> getList() {
return this.appLocalList;
}
public boolean updateAppInfoIcon(String s3ObjectKey, Bitmap
icon) {
if((s3ObjectKey == null) || (icon == null)) {
Log.w(TAG, "Null info when refreshing icon in
List Adapter");
return false;
}
IndexedObjectToShow aInfo =
appLocalMap.get(s3ObjectKey);
if (aInfo != null) {
iconMap.put(aInfo.getS3ObjectKey(), icon);
notifyDataSetChanged();
return true;
}
return false;
}
public boolean updateAppInfoMetadata(ObjectToShow appInfo) {
if((appInfo == null) || (appInfo.getS3ObjectKey() ==
null)) {
Log.w(TAG, "Null info when refreshing metadata
in List Adapter");
return false;
}
IndexedObjectToShow aInfo =
appLocalMap.get(appInfo.getS3ObjectKey
());
if (aInfo != null) {
aInfo.setMetadata(appInfo.getMetadata());
appLocalMap.put(aInfo.getS3ObjectKey(), aInfo);
notifyDataSetChanged();
return true;
}
return false;
}
public Object getItem(int position) {
return
appLocalMap.get(appLocalList.get(position).getS3ObjectKey
());
}
/*
* This method returns the index of the package position in the
application list
*/
public int getIndex(String pkgName) {
if(pkgName == null) {
Log.w(TAG, "Getting index of null package in
List Adapter");
}
int maxSize = appLocalList.size();
ObjectToShow appInfo;
for(int i = 0; i < maxSize; i++) {
appInfo = appLocalList.get(i);
if(appInfo.getS3ObjectKey().equalsIgnoreCase(pkgName)) {
return i;
}
}
return -1;
}
public ObjectToShow getApplicationInfo(int position) {
int maxSize = appLocalList.size();
if( (position < 0) || (position >= maxSize)) {
Log.w(TAG, "Out of bounds");
return null;
}
return appLocalList.get(position);
}
public View getView(int position, View convertView, ViewGroup
parent)
{
if (position >= appList.size()) {
return null;
}
ViewHolder holder;
if (convertView == null) {
convertView =
mInflater.inflate(R.layout.app_list_item, null);
// Creates a ViewHolder and store references to
the two children
views
// we want to bind data to.
holder = new ViewHolder();
holder.appName = (TextView)
convertView.findViewById
(R.id.app_list_item_name);
holder.appIcon = (ImageView)
convertView.findViewById
(R.id.app_list_item_icon);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
ObjectToShow objectToShow = appList.get(position);
ObjectToShow objectToShowWithMetadata = appMap.get
(objectToShow.getKey());
if(objectToShow != null) {
if(objectToShowWithMetadata.getName() != null) {
holder.appName.setText(objectToShowWithMetadata.getName());
}
if(iconMap.get(objectToShow.getKey()) != null) {
holder.appIcon.setImageBitmap(iconMap.get(objectToShow.getKey
()));
}
} else {
holder.appName.setText(defaultText);
holder.appIcon.setImageDrawable(defaultIcon);
}
return convertView;
}
}
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