It seems that the only way to rebuild the fast scroll section data is to toggle fast scrolling off and on again.
-- Kostya 2011/11/21 eehouse <[email protected]>: > On Nov 18, 4:15 am, Mark Murphy <[email protected]> wrote: >> On Thu, Nov 17, 2011 at 10:01 PM, eehouse <[email protected]> wrote: >> > As far as I can tell, a second call tosetListAdapter( new >> > MyCustomAdapter() ) has no effect: the adapter I originally installed >> > in my ListActivity subclass's onCreate() method continues to get >> > called. Is this a known problem/feature? >> >> No. >> >> Here is an example of an application that successfully callssetListAdapter() >> multiple times, based on the user choosing a Reset >> option menu choice: >> >> https://github.com/commonsguy/cw-android/tree/master/Menus/Inflation > > Thanks Mark. I took a look at your code, then modified it to > duplicate the situation I described: added a custom Adapter extending > BaseAdapter and implementing SectionIndexer. As you said, when I > create a new instance of the Adapter and pass it into setListAdapter() > the new instance is used. So the problem I described does not exist. > > However, the problem that led to my mistaken assumption is duplicated > in your code (as I've modified it): only the first instance of my > custom Adapter ever gets its getSections() method called. So though > the new Adapter has replaced the original, the Object[] of sections > returned by the original continues to be used. > > Does anybody know if there's a way to force the framework to call > getSections() when a new Adapter replaces the one that was called > originally? > > I've worked around this problem by creating a new ListActivity > instance each time my data set changes. It's a bit heavy handed but > does the trick. > > Thanks, > > --Eric > > PS I'll append my diffs below for the sake of completeness. The > "reset" menu is what triggers new data. > > diff --git a/Menus/Inflation/src/com/commonsware/android/inflation/ > InflationDemo.java b/Menus/Inflation/src/com/commonsware/android/ > inflation/InflationDemo.java > index 0e182ba..b55a84f 100644 > --- a/Menus/Inflation/src/com/commonsware/android/inflation/ > InflationDemo.java > +++ b/Menus/Inflation/src/com/commonsware/android/inflation/ > InflationDemo.java > @@ -1,3 +1,5 @@ > +/* -*- compile-command: "cd ../../../../../; ant debug install"; -*- > */ > + > /*** > Copyright (c) 2008-2011 CommonsWare, LLC > > @@ -24,23 +26,73 @@ import android.view.Menu; > import android.view.MenuInflater; > import android.view.MenuItem; > import android.view.View; > +import android.view.ViewGroup; > import android.widget.AdapterView; > import android.widget.ArrayAdapter; > import android.widget.EditText; > +import android.widget.TextView; > +import android.widget.SectionIndexer; > + > +import android.widget.BaseAdapter; > > public class InflationDemo extends ListActivity { > - private static final String[] items={"lorem", "ipsum", "dolor", > - "sit", "amet", "consectetuer", "adipiscing", "elit", > - "morbi", "vel", "ligula", "vitae", "arcu", "aliquet", > - "mollis", "etiam", "vel", "erat", "placerat", "ante", > - "porttitor", "sodales", "pellentesque", "augue", "purus"}; > - private ArrayList<String> words=null; > + private static final int NUM_WORDS = 1000; > + private static final int NUM_INDICES = 10; > + private int m_counter = 1; > + > + private class MyListAdapter extends BaseAdapter > + implements SectionIndexer { > + private ArrayList<String> m_words; > + > + public MyListAdapter() { > + super(); > + } > + > + public int getCount() { return NUM_WORDS; } > + > + public Object getItem( int position ) > + { > + TextView text = new TextView( InflationDemo.this ); > + text.setText( String.format( "%d", > + position + (NUM_WORDS * > m_counter) ) ); > + return text; > + } > + > + public View getView( int position, View convertView, ViewGroup > parent ) { > + return (View)getItem( position ); > + } > + > + public long getItemId( int position ) { return position; } > + > + public int getPositionForSection( int section ) > + { > + return section * NUM_WORDS / NUM_INDICES; > + } > + > + public int getSectionForPosition( int position ) > + { > + return position * NUM_INDICES / NUM_WORDS; > + } > + > + public Object[] getSections() > + { > + String[] sections = new String[NUM_INDICES]; > + for ( int ii = 0; ii < NUM_INDICES; ++ii ) { > + int section = (NUM_WORDS * m_counter) > + + (ii * (NUM_WORDS/NUM_INDICES)); > + sections[ii] = String.format( "%d", section ); > + } > + return sections; > + } > + > + } > > @Override > public void onCreate(Bundle icicle) { > super.onCreate(icicle); > > initAdapter(); > + getListView().setFastScrollEnabled( true ); > registerForContextMenu(getListView()); > } > > @@ -59,55 +111,22 @@ public class InflationDemo extends ListActivity { > > @Override > public boolean onOptionsItemSelected(MenuItem item) { > - switch (item.getItemId()) { > + switch (item.getItemId()) { > case R.id.add: > - add(); > - return(true); > + add(); > + return(true); > > case R.id.reset: > - initAdapter(); > - return(true); > - } > + ++m_counter; > + initAdapter(); > + return(true); > + } > > - return(super.onOptionsItemSelected(item)); > - } > - > - @SuppressWarnings("unchecked") > - @Override > - public boolean onContextItemSelected(MenuItem item) { > - AdapterView.AdapterContextMenuInfo info= > - (AdapterView.AdapterContextMenuInfo)item.getMenuInfo(); > - ArrayAdapter<String> > adapter=(ArrayAdapter<String>)getListAdapter(); > - > - switch (item.getItemId()) { > - case R.id.cap: > - String word=words.get(info.position); > - > - word=word.toUpperCase(); > - > - adapter.remove(words.get(info.position)); > - adapter.insert(word, info.position); > - > - return(true); > - > - case R.id.remove: > - adapter.remove(words.get(info.position)); > - > - return(true); > - } > - > - return(super.onContextItemSelected(item)); > + return(super.onOptionsItemSelected(item)); > } > > private void initAdapter() { > - words=new ArrayList<String>(); > - > - for (String s : items) { > - words.add(s); > - } > - > - setListAdapter(new ArrayAdapter<String>(this, > - android.R.layout.simple_list_item_1, words)); > + setListAdapter(new MyListAdapter()); > } > > private void add() { > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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