<com.dk.view.drop.WaterDrop
	android:id="@+id/drop"
	android:layout_width="25dp"
	android:layout_height="25dp"
	android:gravity="center_vertical" />

WaterDrop drop = (WaterDrop) convertView.findViewById(R.id.drop);
	drop.setText(String.valueOf(position));
	drop.setOnDragCompeteListener(new OnDragCompeteListener() {

			@Override
			public void onDrag() {
				Toast.makeText(MainActivity.this, "remove:" + position,
						Toast.LENGTH_SHORT).show();
			}
		});