Adding ListView Sub Item Text in Android
Solution 1
The simplest solution is probably to substitute the ArrayAdapter
and the android.R.layout.simple_list_item_1
that you are using with a SimpleAdapter
and the android.R.layout.simple_list_item_2
predefined layout. This layout is composed by two TextView
s, with an id of android.R.id.text1
(the "item") and android.R.id.text2
(the "sub item") respectively, which you will need as a reference for the SimpleAdapter
to work.
By looking at the constructor for SimpleAdapter
you will notice that, apart from a Context
instance and the id of a layout resource, it takes three parameters that may be new to you:
- a
List<? extends Map<String, ?>>
instance where you put the elements you want theListView
to show. Elements are in the form of aMap
, i.e. something akin to a struct composed by properties in form of name/value pairs. For example, you may use"title"
and"date"
as keys for the title and date of each RSS item, respectively. - an array of strings, where to put the names of the keys in each map that you want to show on the
ListView
. - an array of integers where you need to put the ids of the parts in the list item view where you want the single elements referenced by the keys in the preceding array of strings to be shown. For example, if you want to show the title and date of a RSS item in the "item" and "sub item" views respectively, you use
new String[] { "title", "date" }
as the array of strings argument, andnew int[] { android.R.id.text1, android.R.id.text2 }
as this argument.
A rough code example, just to give you the idea:
List<Map<String, String>> data = new ArrayList<Map<String, String>>();
for (RSSItem item : feed.getAllItems()) {
Map<String, String> datum = new HashMap<String, String>(2);
datum.put("title", item.getTitle());
datum.put("date", item.getDate().toString());
data.add(datum);
}
SimpleAdapter adapter = new SimpleAdapter(this, data,
android.R.layout.simple_list_item_2,
new String[] {"title", "date"},
new int[] {android.R.id.text1,
android.R.id.text2});
itemList.setAdapter(adapter);
The documentation states that "the maps contain the data for each row, and should include all the entries specified in the from parameter", so both title and date should always be present.
Please note that this is all off the top of my head. I haven't actually tested all the code, so you may very well encounter some quirk or bug that you need to adjust or fix on your way up.
Solution 2
You should have an item_list.xml file like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="6dp" >
<TextView
android:id="@+id/page_title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#D8000000"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="@+id/page_date"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/page_title"
android:ellipsize="marquee"
android:lines="3"
android:marqueeRepeatLimit="marquee_forever"
android:textColor="#D8000000"
android:textSize="12sp" />
</RelativeLayout>
and in your listadapter in the method getview :
View row = convertView;
LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
row = inflater.inflate(R.layout.item_list, parent, false);
TextView listTitle = (TextView) row.findViewById(R.id.page_title);
listTitle.setText(title);
TextView date = (TextView) row.findViewById(R.id.page_date);
date.setText( <here put your date from RSS feed>);
return row;
this should do it!
Solution 3
Since you want to map multiple data items to multiple views, you can't use an ArrayAdapter. You'll have to use a SimpleAdapter instead.
Also, I noticed you're getting the RSS feed on the main UI thread. This is going to cause your application to be highly non-responsive. If you don't know what I'm talking about, take a gander at the Painless Threading article (I consider it a must read for any android developer). What you should do instead is use a Loader. They were designed for exactly you type of situation. Although they weren't introduced until API-10 you can still use them on lesser API levels via the Support Package.
Courtney Stephenson
Hello, my name’s Courtney and here’s a few things you need to know about me! I’m a web designer and developer from Melbourne, Florida. I specialize in the design of user experiences online and I’m passionate about making the web a fun place to be. I’ve been designing and building websites for years, and am proud to be part of a world-wide community of designers and developers working to make the internet a more awesome, productive place to be for everyone.
Updated on November 30, 2020Comments
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Courtney Stephenson over 3 years
I have created an RSS reader that lists items in a listview. I also want a date below each item, but I have no idea how to do that. I need someone's help to make the Sub Item text display the pubDate that was retrieved from the RSS feed.
This is the code I have for my class:
public class RSSReader extends Activity implements OnItemClickListener { public final String RSSFEEDOFCHOICE = "http://app.calvaryccm.com/mobile/android/v1/devos"; public final String tag = "RSSReader"; private RSSFeed feed = null; /** Called when the activity is first created. */ public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); // go get our feed! feed = getFeed(RSSFEEDOFCHOICE); // display UI UpdateDisplay(); } private RSSFeed getFeed(String urlToRssFeed) { try { // setup the url URL url = new URL(urlToRssFeed); // create the factory SAXParserFactory factory = SAXParserFactory.newInstance(); // create a parser SAXParser parser = factory.newSAXParser(); // create the reader (scanner) XMLReader xmlreader = parser.getXMLReader(); // instantiate our handler RSSHandler theRssHandler = new RSSHandler(); // assign our handler xmlreader.setContentHandler(theRssHandler); // get our data via the url class InputSource is = new InputSource(url.openStream()); // perform the synchronous parse xmlreader.parse(is); // get the results - should be a fully populated RSSFeed instance, or null on error return theRssHandler.getFeed(); } catch (Exception ee) { // if we have a problem, simply return null System.out.println(ee.getMessage()); System.out.println(ee.getStackTrace()); System.out.println(ee.getCause()); return null; } } public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); menu.add(Menu.NONE, 0, 0, "Refresh"); Log.i(tag,"onCreateOptionsMenu"); return true; } public boolean onOptionsItemSelected(MenuItem item){ switch (item.getItemId()) { case 0: Log.i(tag,"Set RSS Feed"); return true; case 1: Log.i(tag,"Refreshing RSS Feed"); return true; } return false; } private void UpdateDisplay() { TextView feedtitle = (TextView) findViewById(R.id.feedtitle); TextView feedpubdate = (TextView) findViewById(R.id.feedpubdate); ListView itemlist = (ListView) findViewById(R.id.itemlist); if (feed == null) { feedtitle.setText("No RSS Feed Available"); return; } if(feedtitle != null) feedtitle.setText(feed.getTitle()); if(feedpubdate != null) feedpubdate.setText(feed.getPubDate()); ArrayAdapter<RSSItem> adapter = new ArrayAdapter<RSSItem>(this,android.R.layout.simple_list_item_1,feed.getAllItems()); itemlist.setAdapter(adapter); itemlist.setOnItemClickListener(this); itemlist.setSelection(0); } @Override public void onItemClick(AdapterView parent, View v, int position, long id) { //Log.i(tag,"item clicked! [" + feed.getItem(position).getTitle() + "]"); Intent itemintent = new Intent(this,ShowDescription.class); Bundle b = new Bundle(); b.putString("title", feed.getItem(position).getTitle()); b.putString("description", feed.getItem(position).getDescription()); b.putString("link", feed.getItem(position).getLink()); b.putString("pubdate", feed.getItem(position).getPubDate()); itemintent.putExtra("android.intent.extra.INTENT", b); startActivity(itemintent); } }
This is my XML:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Android RSSReader" android:id="@+id/feedtitle"/> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" android:id="@+id/feedpubdate"/> <ListView android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/itemlist" android:fastScrollEnabled="true"/> </LinearLayout>
This is what it looks like now in Eclipse:
This is what it looks like running:
How to make the Sub Item text display the pubDate that was retrieved from the RSS feed?
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Bob Barbara over 12 yearsI second the suggestion about moving the feed download away from the UI thread. Just want to add that another way of doing it, if the OP doesn't want to bring the burden of the support package, may be to use an
AsyncTask
. -
Kurtis Nusbaum over 12 yearsDon't be afraid of the Support Package! It's really easy to use, not a burden at all :)
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MrBr about 11 yearsThat's great but the parameter layout_below doesn't work in LinearLayout. Any solution for that?
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Naman over 7 yearsI know it's far to late but, use
android:orientation="vertical"
in RelativeLayout & removeandroid:layout_below
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user55924 about 6 yearsWhere can i get that article