DragListener.java

package com.pinecone.technology.mcommerce.learning.android.chapter09.draganddrop;

import android.view.View;
import android.widget.ListView;

/**
 * Implement to handle an item being dragged.
 * 
 */
public interface DragListener {
	/**
	 * Called when a drag starts.
	 * 
	 * @param itemView
	 *            - the view of the item to be dragged i.e. the drag view
	 */
	void onStartDrag(View itemView);

	/**
	 * Called when a drag is to be performed.
	 * 
	 * @param x
	 *            - horizontal coordinate of MotionEvent.
	 * @param y
	 *            - verital coordinate of MotionEvent.
	 * @param listView
	 *            - the listView
	 */
	void onDrag(int x, int y, ListView listView);

	/**
	 * Called when a drag stops. Any changes in onStartDrag need to be undone
	 * here so that the view can be used in the list again.
	 * 
	 * @param itemView
	 *            - the view of the item to be dragged i.e. the drag view
	 */
	void onStopDrag(View itemView);
}