Android Open Source - Android-PullToRefresh-master Pull To Refresh Scroll View

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Java Source Code

 * Copyright 2011, 2012 Chris Banes.//  w  w w  . jav a  2  s .c o  m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package com.handmark.pulltorefresh.library;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ScrollView;

public class PullToRefreshScrollView extends PullToRefreshBase<ScrollView> {

  public PullToRefreshScrollView(Context context) {

  public PullToRefreshScrollView(Context context, AttributeSet attrs) {
    super(context, attrs);

  public PullToRefreshScrollView(Context context, Mode mode) {
    super(context, mode);

  public PullToRefreshScrollView(Context context, Mode mode, AnimationStyle style) {
    super(context, mode, style);

  public final Orientation getPullToRefreshScrollDirection() {
    return Orientation.VERTICAL;

  protected ScrollView createRefreshableView(Context context, AttributeSet attrs) {
    ScrollView scrollView;
      scrollView = new InternalScrollViewSDK9(context, attrs);
    } else {
      scrollView = new ScrollView(context, attrs);

    return scrollView;

  protected boolean isReadyForPullStart() {
    return mRefreshableView.getScrollY() == 0;

  protected boolean isReadyForPullEnd() {
    View scrollViewChild = mRefreshableView.getChildAt(0);
    if (null != scrollViewChild) {
      return mRefreshableView.getScrollY() >= (scrollViewChild.getHeight() - getHeight());
    return false;

  final class InternalScrollViewSDK9 extends ScrollView {

    public InternalScrollViewSDK9(Context context, AttributeSet attrs) {
      super(context, attrs);

    protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,
        int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {

      final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
          scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);

      // Does all of the hard work...
      OverscrollHelper.overScrollBy(PullToRefreshScrollView.this, deltaX, scrollX, deltaY, scrollY,
          getScrollRange(), isTouchEvent);

      return returnValue;

     * Taken from the AOSP ScrollView source
    private int getScrollRange() {
      int scrollRange = 0;
      if (getChildCount() > 0) {
        View child = getChildAt(0);
        scrollRange = Math.max(0, child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop()));
      return scrollRange;

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