Hi, I have a performance problem in a ListView. The problem seems to be that it takes too long to setup each individual row. It scrolls very, very painfully slow, because of that.
The actual code renders an Entry differently depending on the read state and if it is changed. When not using this code and just plainly called setText() on the TextViews it is reasonable fast. Also the content is HTML. Am I doing something terribly wrong here? <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android " android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/feed_title" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textSize="11sp" android:paddingTop="3px" /> <TextView android:id="@+id/entry_title" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@id/ feed_title" android:textSize="15sp" android:paddingBottom="3px" /> </RelativeLayout> class EntryListAdapter extends BaseAdapter { [..] public View getView(int position, View convertView, ViewGroup parent) { View rowView = convertView != null ? convertView : activity .findViewById(R.layout.entry_row); if (rowView == null) rowView = inflater.inflate(R.layout.entry_row, parent, false); Entry entry = entries.get(position); --> slow version EntryViewHelper.populateEntryView(rowView, entry); <-- -- OR -- --> (somewhat) fast version TextView entryTitleView = (TextView) rowView.findViewById(R.id.entry_title); TextView feedTitleView = (TextView) rowView.findViewById(R.id.feed_title); feedTitleView.setText(entry.getFeedTitle()); entryTitleView.setText(entry.getTitle()); <-- return rowView; } } class EntryViewHelper { [..] static void populateEntryView(View view, Entry entry) { TextView entryTitleView = (TextView) view .findViewById(R.id.entry_title); TextView feedTitleView = (TextView) view.findViewById(R.id.feed_title); feedTitleView.setText(U.renderTitleToSpannedString( entry.getFeedTitle(), entry.getFeedTitleType())); entryTitleView.setText(U.renderTitleToSpannedString(entry.getTitle(), entry.getTitleType())); int style = Typeface.NORMAL; if (!entry.isRead()) style |= Typeface.BOLD; if (entry.isReadStatePending()) style |= Typeface.ITALIC; entryTitleView.setText(U.renderTitleToSpannedString(entry.getTitle(), entry .getTitleType())); feedTitleView.setText(U.renderTitleToSpannedString( entry.getFeedTitle(), entry.getFeedTitleType())); entryTitleView.setTypeface(Typeface.DEFAULT, style); } } .. import android.text.Html; import android.text.Spanned; import android.text.SpannedString; .. class U { static Spanned renderTitleToSpannedString(String titleString, String titleType) { Spanned title = null; if ("html".equals(titleType) || "xhtml".equals(titleType)) title = Html.fromHtml(titleString); else title = new SpannedString(titleString); return title; } } Btw. I re-use the convert view etc. The performance degradation only happens when I style the output. Cheers, Mariano --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
