Example usage for android.support.v4.view ViewCompat canScrollVertically

Introduction

In this page you can find the example usage for android.support.v4.view ViewCompat canScrollVertically.

Prototype

public static boolean canScrollVertically(View v, int direction)

Source Link

Document

Check if this view can be scrolled vertically in a certain direction.

Usage

From source file:cn.bingoogolapple.refreshlayout.util.BGARefreshScrollingUtil.java

public static boolean isRecyclerViewToTop(RecyclerView recyclerView) {
    if (recyclerView != null) {
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if (manager == null) {
            return true;
        }//w  ww . jav  a2  s.  co  m
        if (manager.getItemCount() == 0) {
            return true;
        }

        if (manager instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) manager;

            int firstChildTop = 0;
            if (recyclerView.getChildCount() > 0) {
                // ?item?
                View firstVisibleChild = recyclerView.getChildAt(0);
                if (firstVisibleChild != null
                        && firstVisibleChild.getMeasuredHeight() >= recyclerView.getMeasuredHeight()) {
                    if (android.os.Build.VERSION.SDK_INT < 14) {
                        return !(ViewCompat.canScrollVertically(recyclerView, -1)
                                || recyclerView.getScrollY() > 0);
                    } else {
                        return !ViewCompat.canScrollVertically(recyclerView, -1);
                    }
                }

                // RecyclerView???0??top

                // itemtopMargin?0??
                View firstChild = recyclerView.getChildAt(0);
                RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) firstChild
                        .getLayoutParams();
                firstChildTop = firstChild.getTop() - layoutParams.topMargin
                        - getRecyclerViewItemTopInset(layoutParams) - recyclerView.getPaddingTop();
            }

            if (layoutManager.findFirstCompletelyVisibleItemPosition() < 1 && firstChildTop == 0) {
                return true;
            }
        } else if (manager instanceof StaggeredGridLayoutManager) {
            StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;

            int[] out = layoutManager.findFirstCompletelyVisibleItemPositions(null);
            if (out[0] < 1) {
                return true;
            }
        }
    }
    return false;
}

From source file:cn.androidy.swiftlib.view.MultiSwipeRefreshLayout.java

/**
 * Utility method to check whether a {@link View} can scroll up from it's current position.
 * Handles platform version differences, providing backwards compatible functionality where
 * needed./*from w w  w  . ja  v  a2s .co m*/
 */
private static boolean canViewScrollUp(View view) {
    if (android.os.Build.VERSION.SDK_INT >= 14) {
        // For ICS and above we can call canScrollVertically() to determine this
        return ViewCompat.canScrollVertically(view, -1);
    } else {
        if (view instanceof AbsListView) {
            // Pre-ICS we need to manually check the first visible item and the child view's top
            // value
            final AbsListView listView = (AbsListView) view;
            return listView.getChildCount() > 0 && (listView.getFirstVisiblePosition() > 0
                    || listView.getChildAt(0).getTop() < listView.getPaddingTop());
        } else {
            // For all other view types we just check the getScrollY() value
            return view.getScrollY() > 0;
        }
    }
}

From source file:android.support.ViewUtils.java

public static boolean canScrollUp(View view) {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (view instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) view;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {//from   w  w  w .  j ava2s.  c  o m
            return ViewCompat.canScrollVertically(view, -1) || view.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(view, -1);
    }
}

From source file:com.czy.reecycleviewheader.ScrollableHelper.java

/**
 * ?,ScrollAbleLayout???//from w ww  .  ja va  2  s .  c  o m
 * ??AdapterView,ScrollView,RecyclerView
 * ??view?
 *
 * @return
 */
public boolean isTop() {
    View scrollableView = getScrollableView();
    boolean isCanScrollDown = ViewCompat.canScrollVertically(scrollableView, -1);
    return !isCanScrollDown;

    //        if (scrollableView == null) {
    ////            throw new NullPointerException("You should call ScrollableHelper.setCurrentScrollableContainer() to set ScrollableContainer.");
    //            return false;
    //        }
    //        if (scrollableView instanceof AdapterView) {
    //            return isAdapterViewTop((AdapterView) scrollableView);
    //        }
    //        if (scrollableView instanceof ScrollView) {
    //            return isScrollViewTop((ScrollView) scrollableView);
    //        }
    //        if (scrollableView instanceof RecyclerView) {
    //            return isRecyclerViewTop((RecyclerView) scrollableView);
    //        }
    //        if (scrollableView instanceof WebView) {
    //            return isWebViewTop((WebView) scrollableView);
    //        }
    //        throw new IllegalStateException("scrollableView must be a instance of AdapterView|ScrollView|RecyclerView");
}

From source file:com.snu_artoon.arwebtoonplayer.WebtoonView.WebtoonViewActivity.java

public static boolean isAtBottom(RecyclerView recyclerView) {
    return !ViewCompat.canScrollVertically(recyclerView, 1);
}

From source file:com.nadmm.airports.ListFragmentBase.java

@Override
public boolean canSwipeRefreshChildScrollUp() {
    return ViewCompat.canScrollVertically(mListView, -1);
}

From source file:org.cm.podd.report.fragment.SwipeRefreshFragment.java

protected boolean canViewScrollUp(View view) {
    if (android.os.Build.VERSION.SDK_INT >= 14) {
        // For ICS and above we can call canScrollVertically() to determine this
        return ViewCompat.canScrollVertically(view, -1);
    } else {//from  w w  w  . j a  v a  2s  . c  o  m
        // Pre-ICS we need to manually check the first visible item and the child view's top
        // value
        return (view.getVerticalScrollbarPosition() > 0 || view.getTop() < view.getPaddingTop());
    }
}

From source file:cn.zy.ef.refresh.utils.ScrollingUtil.java

public static boolean isRecyclerViewToTop(RecyclerView recyclerView) {
    if (recyclerView != null) {
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if (manager == null) {
            return true;
        }/*from  w w w .ja  v  a  2  s. c om*/
        if (manager.getItemCount() == 0) {
            return true;
        }

        if (manager instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) manager;

            int firstChildTop = 0;
            if (recyclerView.getChildCount() > 0) {
                // ?item?
                View firstVisibleChild = recyclerView.getChildAt(0);
                if (firstVisibleChild != null
                        && firstVisibleChild.getMeasuredHeight() >= recyclerView.getMeasuredHeight()) {
                    if (Build.VERSION.SDK_INT < 14) {
                        return !(ViewCompat.canScrollVertically(recyclerView, -1)
                                || recyclerView.getScrollY() > 0);
                    } else {
                        return !ViewCompat.canScrollVertically(recyclerView, -1);
                    }
                }

                // RecyclerView???0??top

                // itemtopMargin?0??
                View firstChild = recyclerView.getChildAt(0);
                RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) firstChild
                        .getLayoutParams();
                firstChildTop = firstChild.getTop() - layoutParams.topMargin
                        - getRecyclerViewItemTopInset(layoutParams) - recyclerView.getPaddingTop();
            }

            if (layoutManager.findFirstCompletelyVisibleItemPosition() < 1 && firstChildTop == 0) {
                return true;
            }
        } else if (manager instanceof StaggeredGridLayoutManager) {
            StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;

            int[] out = layoutManager.findFirstCompletelyVisibleItemPositions(null);
            if (out[0] < 1) {
                return true;
            }
        }
    }
    return false;
}

From source file:com.lanma.customviewproject.utils.ScrollingUtil.java

/**
 * RecyclerView???/*  w  w w .jav a2  s .  c  om*/
 */
public static boolean isRecyclerViewToTop(RecyclerView recyclerView) {
    if (recyclerView != null) {
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if (manager == null) {
            return true;
        }
        if (manager.getItemCount() == 0) {
            return true;
        }

        if (manager instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) manager;

            int firstChildTop = 0;
            if (recyclerView.getChildCount() > 0) {
                // ?item?
                View firstVisibleChild = recyclerView.getChildAt(0);
                if (firstVisibleChild != null
                        && firstVisibleChild.getMeasuredHeight() >= recyclerView.getMeasuredHeight()) {
                    if (Build.VERSION.SDK_INT < 14) {
                        return !(ViewCompat.canScrollVertically(recyclerView, -1)
                                || recyclerView.getScrollY() > 0);
                    } else {
                        return !ViewCompat.canScrollVertically(recyclerView, -1);
                    }
                }

                // RecyclerView???0??top

                // itemtopMargin?0??
                View firstChild = recyclerView.getChildAt(0);
                RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) firstChild
                        .getLayoutParams();
                firstChildTop = firstChild.getTop() - layoutParams.topMargin
                        - getRecyclerViewItemTopInset(layoutParams) - recyclerView.getPaddingTop();
            }

            if (layoutManager.findFirstCompletelyVisibleItemPosition() < 1 && firstChildTop == 0) {
                return true;
            }
        } else if (manager instanceof StaggeredGridLayoutManager) {
            StaggeredGridLayoutManager layoutManager = (StaggeredGridLayoutManager) manager;

            int[] out = layoutManager.findFirstCompletelyVisibleItemPositions(null);
            if (out[0] < 1) {
                return true;
            }
        }
    }
    return false;
}

From source file:com.nadmm.airports.FragmentBase.java

@Override
public boolean canSwipeRefreshChildScrollUp() {
    return mTopScrollView != null && ViewCompat.canScrollVertically(mTopScrollView, -1);
}