DropZone.java

package com.google.mcommerce.sample.android.chapter08.dragAndDrop;

// This file is DropZone.java
import android.animation.ObjectAnimator;
import android.app.Fragment;
import android.content.ClipData;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.CycleInterpolator;
import android.widget.TextView;

import com.google.mcommerce.sample.android.R;

public class DropZone extends Fragment {

	private View dropTarget;
	private TextView dropMessage;

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle icicle) {
		View v = inflater
				.inflate(R.layout.c08_drag_drop_zone, container, false);

		dropMessage = (TextView) v.findViewById(R.id.dropmessage);

		dropTarget = (View) v.findViewById(R.id.droptarget);
		dropTarget.setOnDragListener(new View.OnDragListener() {
			private static final String DROPTAG = "DropTarget";
			private int dropCount = 0;
			private ObjectAnimator anim;

			public boolean onDrag(View v, DragEvent event) {
				int action = event.getAction();
				boolean result = true;
				switch (action) {
				case DragEvent.ACTION_DRAG_STARTED:
					Log.v(DROPTAG, "drag started in dropTarget");
					break;
				case DragEvent.ACTION_DRAG_ENTERED:
					Log.v(DROPTAG, "drag entered dropTarget");
					anim = ObjectAnimator
							.ofFloat((Object) v, "alpha", 1f, 0.5f);
					anim.setInterpolator(new CycleInterpolator(40));
					anim.setDuration(30 * 1000); // 30 seconds
					anim.start();
					break;
				case DragEvent.ACTION_DRAG_EXITED:
					Log.v(DROPTAG, "drag exited dropTarget");
					if (anim != null) {
						anim.end();
						anim = null;
					}
					break;
				case DragEvent.ACTION_DRAG_LOCATION:
					Log.v(DROPTAG,
							"drag proceeding in dropTarget: " + event.getX()
									+ ", " + event.getY());
					break;
				case DragEvent.ACTION_DROP:
					Log.v(DROPTAG, "drag drop in dropTarget");
					if (anim != null) {
						anim.end();
						anim = null;
					}

					ClipData data = event.getClipData();
					Log.v(DROPTAG, "Item data is "
							+ data.getItemAt(0).getText());

					dropCount++;
					String message = dropCount + " drop";
					if (dropCount > 1)
						message += "s";
					dropMessage.setText(message);
					break;
				case DragEvent.ACTION_DRAG_ENDED:
					Log.v(DROPTAG, "drag ended in dropTarget");
					if (anim != null) {
						anim.end();
						anim = null;
					}
					break;
				default:
					Log.v(DROPTAG, "other action in dropzone: " + action);
					result = false;
				}
				return result;
			}
		});
		return v;
	}
}