DragNDropListActivity.java

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

import java.util.ArrayList;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;

public class DragNDropListActivity extends ListActivity {

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.dragndroplistview);

		ArrayList<String> content = new ArrayList<String>(mListContent.length);
		for (int i = 0; i < mListContent.length; i++) {
			content.add(mListContent[i]);
		}

		setListAdapter(new DragNDropAdapter(this,
				new int[] { R.layout.dragitem }, new int[] { R.id.TextView01 },
				content));// new DragNDropAdapter(this,content)
		ListView listView = getListView();

		if (listView instanceof DragNDropListView) {
			((DragNDropListView) listView).setDropListener(mDropListener);
			((DragNDropListView) listView).setRemoveListener(mRemoveListener);
			((DragNDropListView) listView).setDragListener(mDragListener);
		}
	}

	private DropListener mDropListener = new DropListener() {
		public void onDrop(int from, int to) {
			ListAdapter adapter = getListAdapter();
			if (adapter instanceof DragNDropAdapter) {
				((DragNDropAdapter) adapter).onDrop(from, to);
				getListView().invalidateViews();
			}
		}
	};

	private RemoveListener mRemoveListener = new RemoveListener() {
		public void onRemove(int which) {
			ListAdapter adapter = getListAdapter();
			if (adapter instanceof DragNDropAdapter) {
				((DragNDropAdapter) adapter).onRemove(which);
				getListView().invalidateViews();
			}
		}
	};

	private DragListener mDragListener = new DragListener() {

		int backgroundColor = 0xe0103010;
		int defaultBackgroundColor;

		public void onDrag(int x, int y, ListView listView) {
			// TODO Auto-generated method stub
		}

		public void onStartDrag(View itemView) {
			itemView.setVisibility(View.INVISIBLE);
			defaultBackgroundColor = itemView.getDrawingCacheBackgroundColor();
			itemView.setBackgroundColor(backgroundColor);
			ImageView iv = (ImageView) itemView.findViewById(R.id.ImageView01);
			if (iv != null)
				iv.setVisibility(View.INVISIBLE);
		}

		public void onStopDrag(View itemView) {
			itemView.setVisibility(View.VISIBLE);
			itemView.setBackgroundColor(defaultBackgroundColor);
			ImageView iv = (ImageView) itemView.findViewById(R.id.ImageView01);
			if (iv != null)
				iv.setVisibility(View.VISIBLE);
		}

	};

	private static String[] mListContent = { "Item 1", "Item 2", "Item 3",
			"Item 4", "Item 5", "Item 6", "Item 7" };
}