simple implementation of quick return pattern for android listview

QuickReturnListView

public class QuickReturn implements AbsListView.OnScrollListener {

	public static QuickReturn apply(ListView listView, View targetView){
		return new QuickReturn(listView, targetView);
	}

	private final ListView mListView;
	private final View mTargetView;

	private AbsListView.OnScrollListener mOnScrollListener;

	private int mLastFirstVisibleItem;
	private int mLastTop;
	private int mLastHeight;

	private QuickReturn(ListView listView, View targetView) {
		mListView = listView;
		mTargetView = targetView;
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
			mListView.setOnScrollListener(this);
		}
	}

	public void withOnScrollListener(AbsListView.OnScrollListener onScrollListener) {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
			mOnScrollListener = onScrollListener;
		} else {
			mListView.setOnScrollListener(onScrollListener);
		}
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if (mOnScrollListener != null) {
			mOnScrollListener.onScrollStateChanged(view, scrollState);
		}
	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
		if (mOnScrollListener != null) {
			mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
		}
		View v = mListView.getChildAt(0);
		int top = (v == null) ? 0 : v.getTop();
		int height = (v == null) ? 0 : v.getHeight();
		if (firstVisibleItem == mLastFirstVisibleItem) {
			translateBy(top - mLastTop);
		} else {
			if (firstVisibleItem > mLastFirstVisibleItem) {
				translateBy(-mLastHeight - mLastTop + top);
			} else {
				translateBy(height - mLastTop + top);
			}
		}

		mLastFirstVisibleItem = firstVisibleItem;
		mLastTop = top;
		mLastHeight = height;
	}

	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	private void translateBy(int offsetY) {
		int newTranslation = (int) mTargetView.getTranslationY() + offsetY;
		if (newTranslation < -mTargetView.getHeight()) {
			mTargetView.setTranslationY(-mTargetView.getHeight());
		} else if (newTranslation > 0) {
			mTargetView.setTranslationY(0);
		} else {
			mTargetView.setTranslationY(newTranslation);
		}
	}
}

usage

QuickReturn.apply(mListView, mTargetView).withOnScrollListener(this);