Android: ListView tells me it's populated but not displaying items

Question

So I've googled, and scoured SO for an answer to what I think is probably a ridiculous oversight, but here goes.

I have a ListView that I'm populating with an ArrayAdapter that I'm building out of a list of objects I'm using elsewhere in my application. I have checked via getCount that there are items in the adapter, both before and after I call .setAdapter(). Nothing is showing up in my application however.

My main layout res/layout/playlistview:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/playlist_screen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#80000000"
android:gravity="center"
android:orientation="horizontal" >

<ListView
    android:id="@+id/playlistview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:divider="#206"
    android:background="#602" >

</ListView>

</LinearLayout>

(I set the colors so I could see what's going on more easily)

the textview for each item res/layout/singlelistitem:

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/single_item"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="16sp"
    android:padding="5dp" 
    android:background="#206">
</TextView>

and the code I use to populate it:

private ListView playlistView;

private void buildPlaylistView() {
playlistView = (ListView)findViewById(R.id.playlistview);

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.singlelistitem, R.id.single_item, playlist.titlesAsArray());

playlistView.setAdapter(adapter);

playlistView.setVisibility(View.VISIBLE);

adapter.notifyDataSetChanged();
((ArrayAdapter<String>)playlistView.getAdapter()).notifyDataSetChanged();
}

playlist.titlesAsArray() does return String[] and it works.

I have both of the .notifyDataSetChanged() in there, since I found that on SO and gave it a try.

When I change the android:layout_height in the ListView object in my XML to wrap_content, I see only the opaque background that is in the LinearLayout that wraps it. When I set the ListView android:layout_height to match_parent, the whole screen is #206 (magentish).

When i check getCount() on the adapter before setAdapter() it says there are items. When I check it after, from the view itself, it says there are the same number of items. I'm totally lost on this one, but nothing is displayed.

Answer 1

Try changing from android:orientation="horizontal" to android:orientation="vertical" this may fix.