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 /*
  *  Copyright 2011 Yuri Kanivets
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *  http://www.apache.org/licenses/LICENSE-2.0
  *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package kankan.wheel.widget.adapters;
import  android.database.DataSetObserver;
import  android.view.View;
import  android.view.ViewGroup;

Wheel items adapter interface
public interface WheelViewAdapter {
Gets items count

Returns:
the count of wheel items
	public int getItemsCount();

Get a View that displays the data at the specified position in the data set

Parameters:
index the item index
convertView the old view to reuse if possible
parent the parent that this view will eventually be attached to
Returns:
the wheel item View
	public View getItem(int index, View convertView, ViewGroup parent);

Get a View that displays an empty wheel item placed before the first or after the last wheel item.

Parameters:
convertView the old view to reuse if possible
parent the parent that this view will eventually be attached to
Returns:
the empty item View
	public View getEmptyItem(View convertView, ViewGroup parent);

Register an observer that is called when changes happen to the data used by this adapter.

Parameters:
observer the observer to be registered
	public void registerDataSetObserver(DataSetObserver observer);

Unregister an observer that has previously been registered

Parameters:
observer the observer to be unregistered
	void unregisterDataSetObserver (DataSetObserver observer);
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