1 page.title=AdapterView 2 parent.title=User Interface 3 parent.link=index.html 4 @jd:body 5 6 <div id="qv-wrapper"> 7 <div id="qv"> 8 <h2>In this document</h2> 9 <ol> 10 <li><a href="#FillingTheLayout">Filling the Layout with Data</a></li> 11 <li><a href="#HandlingUserSelections">Handling User Selections</a></li> 12 </ol> 13 14 <h2>Related tutorials</h2> 15 <ol> 16 <li><a href="{@docRoot}resources/tutorials/views/hello-spinner.html">Spinner</a></li> 17 <li><a href="{@docRoot}resources/tutorials/views/hello-listview.html">List View</a></li> 18 <li><a href="{@docRoot}resources/tutorials/views/hello-gridview.html">Grid View</a></li> 19 </ol> 20 </div> 21 </div> 22 23 24 25 <pre> 26 // Get a Spinner and bind it to an ArrayAdapter that 27 // references a String array. 28 Spinner s1 = (Spinner) findViewById(R.id.spinner1); 29 ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource( 30 this, R.array.colors, android.R.layout.simple_spinner_item); 31 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 32 s1.setAdapter(adapter); 33 34 // Load a Spinner and bind it to a data query. 35 private static String[] PROJECTION = new String[] { 36 People._ID, People.NAME 37 }; 38 39 Spinner s2 = (Spinner) findViewById(R.id.spinner2); 40 Cursor cur = managedQuery(People.CONTENT_URI, PROJECTION, null, null); 41 42 SimpleCursorAdapter adapter2 = new SimpleCursorAdapter(this, 43 android.R.layout.simple_spinner_item, // Use a template 44 // that displays a 45 // text view 46 cur, // Give the cursor to the list adapter 47 new String[] {People.NAME}, // Map the NAME column in the 48 // people database to... 49 new int[] {android.R.id.text1}); // The "text1" view defined in 50 // the XML template 51 52 adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 53 s2.setAdapter(adapter2); 54 </pre> 55 56 <p>Note that it is necessary to have the People._ID column in projection used with CursorAdapter 57 or else you will get an exception.</p> 58 59 <p>If, during the course of your application's life, you change the underlying data that is read by your Adapter, 60 you should call {@link android.widget.ArrayAdapter#notifyDataSetChanged()}. This will notify the attached View 61 that the data has been changed and it should refresh itself.</p> 62 63 <h2 id="HandlingUserSelections">Handling User Selections</h2> 64 <p>You handle the user's selection by setting the class's {@link 65 android.widget.AdapterView.OnItemClickListener} member to a listener and 66 catching the selection changes. </p> 67 <pre> 68 // Create a message handling object as an anonymous class. 69 private OnItemClickListener mMessageClickedHandler = new OnItemClickListener() { 70 public void onItemClick(AdapterView parent, View v, int position, long id) 71 { 72 // Display a messagebox. 73 Toast.makeText(mContext,"You've got an event",Toast.LENGTH_SHORT).show(); 74 } 75 }; 76 77 // Now hook into our object and set its onItemClickListener member 78 // to our class handler object. 79 mHistoryView = (ListView)findViewById(R.id.history); 80 mHistoryView.setOnItemClickListener(mMessageClickedHandler); 81 </pre> 82 83 <div class="special"> 84 <p>For more discussion on how to create different AdapterViews, read the following tutorials: 85 <a href="{@docRoot}resources/tutorials/views/hello-spinner.html">Hello Spinner</a>, 86 <a href="{@docRoot}resources/tutorials/views/hello-listview.html">Hello ListView</a>, and 87 <a href="{@docRoot}resources/tutorials/views/hello-gridview.html">Hello GridView</a>. 88 </div> 89
