docs/html/guide/topics/ui/binding.jd

page.title=AdapterView
parent.title=User Interface
parent.link=index.html
@jd:body

<div id="qv-wrapper">
<div id="qv">
  <h2>In this document</h2>
  <ol>
    <li><a href="#FillingTheLayout">Filling the Layout with Data</a></li>
    <li><a href="#HandlingUserSelections">Handling User Selections</a></li>
  </ol>
</div>
</div>



<pre>
// Get a Spinner and bind it to an ArrayAdapter that
// references a String array.
Spinner s1 = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
    this, R.array.colors, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s1.setAdapter(adapter);

// Load a Spinner and bind it to a data query.
private static String[] PROJECTION = new String[] {
        People._ID, People.NAME
    };

Spinner s2 = (Spinner) findViewById(R.id.spinner2);
Cursor cur = managedQuery(People.CONTENT_URI, PROJECTION, null, null);

SimpleCursorAdapter adapter2 = new SimpleCursorAdapter(this,
    android.R.layout.simple_spinner_item, // Use a template
                                          // that displays a
                                          // text view
    cur, // Give the cursor to the list adapter
    new String[] {People.NAME}, // Map the NAME column in the
                                         // people database to...
    new int[] {android.R.id.text1}); // The "text1" view defined in
                                     // the XML template

adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s2.setAdapter(adapter2);
</pre>

<p>Note that it is necessary to have the People._ID column in projection used with CursorAdapter
or else you will get an exception.</p>

<p>If, during the course of your application's life, you change the underlying data that is read by your Adapter,
you should call {@link android.widget.ArrayAdapter#notifyDataSetChanged()}. This will notify the attached View
that the data has been changed and it should refresh itself.</p>

<h2 id="HandlingUserSelections">Handling User Selections</h2>
<p>You handle the user's selection by setting the class's {@link
android.widget.AdapterView.OnItemClickListener} member to a listener and
catching the selection changes. </p>
<pre>
// Create a message handling object as an anonymous class.
private OnItemClickListener mMessageClickedHandler = new OnItemClickListener() {
    public void onItemClick(AdapterView parent, View v, int position, long id)
    {
        // Display a messagebox.
        Toast.makeText(mContext,"You've got an event",Toast.LENGTH_SHORT).show();
    }
};

// Now hook into our object and set its onItemClickListener member
// to our class handler object.
mHistoryView = (ListView)findViewById(R.id.history);
mHistoryView.setOnItemClickListener(mMessageClickedHandler);
</pre>

<div class="special">
<p>For more discussion on how to create different AdapterViews, read the following guides:
<a href="{@docRoot}guide/topics/ui/controls/spinner.html">Spinner</a>,
<a href="{@docRoot}guide/topics/ui/layout/listview.html">List View</a>, and
<a href="{@docRoot}guide/topics/ui/layout/gridview.html">Grid View</a>.
</div>