use the efficient list adapter And also you can use the TwoLineListitem....
On Wed, Jan 14, 2009 at 2:23 PM, Mariano Kamp <mariano.k...@gmail.com>wrote: > *bump* ;-) > > > On Sun, Jan 11, 2009 at 7:10 PM, Mariano Kamp <mariano.k...@gmail.com>wrote: > >> 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 -~----------~----~----~----~------~----~------~--~---
