I thought I knew how to catch list selection events in Android and
then I regained consciousness. In my situation, I have a ListView that
I populate with a custom view, all of the same class (let's call it
the NewsChannel() class). NewsChannel consists of a LinearLayout of
ImageViews and TextViews. When the list is displayed, the user may
select a NewsChannel item in the list; I want to find out which list
item was selected.
Also, I registered an onClickListener to one of the TextViews and that
works fine: when the text is clicked on, an activity is launched which
is looking for the position of the NewsChannel item in the list.
So, here's what my code looks like:
1. Registering the onClickListener in the ListActivity:
public class NewsListActivity extends ListActivity
{
.
.
.
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.news_list_format);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// When clicked, show a toast with the TextView text
item_index = position;
Toast.makeText(getApplicationContext(), "item clicked =
" + position, Toast.LENGTH_SHORT).show();
}
});
.
.
.
2. The layout for the ListView associated with NewsListActivity:
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/
android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/wpaper_tile"
>
<ListView android:id="@id/android:list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:dividerHeight="15dp"
android:divider="@android:color/transparent"
android:cacheColorHint="@android:color/transparent"
android:scrollbars="none"
/>
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="55dp"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:background="#88000000"
/>
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:src="@drawable/phonetop_bg"
/>
</RelativeLayout>
3. The NewsChannel layout:
<?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">
<include layout="@layout/news_heading_format"
android:id="@+id/news_heading_header"/>
<ImageView android:id="@+id/news_channel_image"
android:layout_width="88dp"
android:layout_height="66dp"
android:layout_alignParentLeft="true"
android:layout_below="@id/news_heading_header"
android:padding="10dp" />
<TextView android:id="@+id/news_channel_text"
android:lines="4"
android:inputType="textMultiLine"
android:layout_toRightOf="@id/news_channel_image"
android:layout_below="@id/news_heading_header"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
When I run the app, the ItemClickListener is never called. However, if
NewsChannel were of a simpler type, say, a single ImageView or
TextView embedded in the layout, the callback does get called.
Any idea what I'm doing wrong? My whole goal is simply to let the
activity launched by NewsChannel (not shown) to find out which
instance of NewsChannel it was launched from. Thanks, in advance!
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