TwoWayView PullToRefresh simple implementation

ids.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <item type="id" name="gridview" />
    <item type="id" name="webview" />
    <item type="id" name="scrollview" />
    <item type="id" name="twowayview" />
</resources>

SimplePullToRefreshTwoWayView.java

package com.handmark.pulltorefresh.library;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;

import org.lucasr.twowayview.widget.TwoWayView;

public class SimplePullToRefreshTwoWayView extends PullToRefreshBase<TwoWayView> {
  public SimplePullToRefreshTwoWayView(Context context) {
    super(context);
  }

  public SimplePullToRefreshTwoWayView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public SimplePullToRefreshTwoWayView(Context context, Mode mode) {
    super(context, mode);
  }

  @Override
  public Orientation getPullToRefreshScrollDirection() {
    return Orientation.VERTICAL;
  }

  @Override
  protected TwoWayView createRefreshableView(Context context, AttributeSet attrs) {
    TwoWayView twoWayView;
    twoWayView = new TwoWayView(context, attrs);
    twoWayView.setId(R.id.twowayview);

    return twoWayView;
  }

  @Override
  protected boolean isReadyForPullEnd() {
    if (mRefreshableView.getChildCount() <= 0) {
      return true;
    }
    
    int firstVisiblePosition = mRefreshableView.getChildAdapterPosition(mRefreshableView.getChildAt(0));

    return firstVisiblePosition == 0 && mRefreshableView.getChildAt(0).getTop() == mRefreshableView.getPaddingTop();
  }

  @Override
  protected boolean isReadyForPullStart() {
    int firstVisiblePosition = mRefreshableView.getFirstVisiblePosition();

    if (firstVisiblePosition > 0) {
      return false;
    }

    final View firstVisibleChildView = mRefreshableView.getChildAt(firstVisiblePosition);

    if (firstVisibleChildView.getTop() < mRefreshableView.getTop()) {
      return false;
    }

    return true;
  }
}