Listing 13-14. Implementing a Configurator Activity
public class ConfigureBDayWidgetActivity extends Activity
{
   private static String tag = "ConfigureBDayWidgetActivity";
   private int mAppWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.edit_bday_widget);
      setupButton();
      Intent intent = getIntent();
      Bundle extras = intent.getExtras();

      if (extras != null) {
         mAppWidgetId = extras.getInt(
         AppWidgetManager.EXTRA_APPWIDGET_ID,
         AppWidgetManager.INVALID_APPWIDGET_ID);
      }
   }

   private void setupButton(){
      Button b = (Button)this.findViewById(R.id.bdw_button_update_bday_widget);
      b.setOnClickListener(
         new Button.OnClickListener(){
            public void onClick(View v)
            {
               parentButtonClicked(v);
            }
         });
   }

   private void parentButtonClicked(View v){
      String name = this.getName();
      String date = this.getDate();
      if (Utils.validateDate(date) == false){
         this.setDate("wrong date:" + date);
         return;
      }
      if (this.mAppWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID){
         return;
      }
      updateAppWidgetLocal(name,date);
      Intent resultValue = new Intent();
      resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
      setResult(RESULT_OK, resultValue);
      finish();
   }

   private String getName(){
      EditText nameEdit = (EditText)this.findViewById(R.id.bdw_bday_name_id);
      String name = nameEdit.getText().toString();
      return name;
   }

   private String getDate(){
      EditText dateEdit = (EditText)this.findViewById(R.id.bdw_bday_date_id);
      String dateString = dateEdit.getText().toString();
      return dateString;
   }

   private void setDate(String errorDate){
      EditText dateEdit = (EditText)this.findViewById(R.id.bdw_bday_date_id);
      dateEdit.setText("error");
      dateEdit.requestFocus();
   }

   private void updateAppWidgetLocal(String name, String dob){
      BDayWidgetModel m = new BDayWidgetModel(mAppWidgetId,name,dob);
      updateAppWidget(this,AppWidgetManager.getInstance(this),m);
      m.savePreferences(this);
   }

   public static void updateAppWidget(Context context,
                              AppWidgetManager appWidgetManager,
                              BDayWidgetModel widgetModel)
   {
      RemoteViews views = new RemoteViews(context.getPackageName(),
                                    R.layout.bday_widget);
      views.setTextViewText(R.id.bdw_w_name
                     , widgetModel.getName() + ":" + widgetModel.iid);
      views.setTextViewText(R.id.bdw_w_date
                     , widgetModel.getBday());

      //update the name
      views.setTextViewText(R.id.bdw_w_days,Long.toString(widgetModel.howManyDays()));
      Intent defineIntent = new Intent(Intent.ACTION_VIEW,
                        Uri.parse("http://www.google.com"));
      PendingIntent pendingIntent =
               PendingIntent.getActivity(context,
                                 0 /* no requestCode */,
                                 defineIntent,
                                 0 /* no flags */);
      views.setOnClickPendingIntent(R.id.bdw_w_button_buy, pendingIntent);
      // Tell the widget manager
      appWidgetManager.updateAppWidget(widgetModel.iid, views);
   }
}