Patrick Plaatje wrote:
> Hi All,
>
> Struggling and struggling, but can't find the thing i'm doin wrong in my
> listview implementation. No exceptions, just no listview. I have a
> customized adapter with an overridden getView method, but the Log.d
> won't show, so i guess my adapter is just wrong? Could somebody have a
> look at the code below? Thanks in advance!
<snip>
> public class ArticleList extends ListActivity {
>
> /** Called when the activity is first created. */
> public void onCreate(Bundle savedInstanceState) {
> // call super constructor
> super.onCreate(savedInstanceState);
>
> // set the layout used for this activity
> setContentView(R.layout.article_list);
>
> // create a new splashscreen and show it:
> SplashScreen ss = new SplashScreen(this);
> ss.show();
>
> // now that we have the splash screen displayed fire up the
> // method that's going to fetch our content
> ArticleListView alv = new ArticleListView(this);
> alv.setSource("rss");
> alv.show();
> ss.hide();
> }
Your splash screen will never be shown, since you hide it before it is
displayed. Remember that nothing you do in onCreate(), or any callback,
will affect the screen until *after* the callback returns.
If you are eventually going to do a real implementation of this, with
HTTP retrieval of a feed, you are going to need to rework this code to
take threading into account. You will not be successful retrieving a
feed on the main application thread, as you will take too long and get
the fabled "application not responding" (ANR) force-close dialog. You
will need to do the retrieval in a background operation, perhaps using
an AsyncTask.
> public class ArticleListView {
>
> private String source=null;
> private ListView lv;
>
> public ArticleListView(ListActivity act) {
>
> // find the list view
> lv = (ListView) act.findViewById(android.R.id.list);
>
> // get the messages
> FeedManager fm = new FeedManager();
> Feed f = fm.getFeed("Some valid feed url");
> List<FeedMessage> messages = f.getMessages();
>
> // get the adapter for the list
> ArticleDetailAdapter adp = new ArticleDetailAdapter(act,
> android.R.layout.simple_list_item_2, messages);
>
> lv.setAdapter(adp);
>
> }
>
> public void show(){
> lv.setVisibility(View.VISIBLE);
> }
>
> public void hide(){
> lv.setVisibility(View.GONE);
> }
>
> public void setSource(String source){
> this.source = source;
> }
>
> public String getSource(){
> return source;
> }
>
> }
You could use hierarchyviewer to see if your ListView is actually
becoming visible. You could also check to see that f.getMessages() will
return a non-empty list -- if the list is empty, getView() will not be
called for any rows.
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Android Training in Germany, 18-22 January 2010: http://bignerdranch.com
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