Java Code Examples for android.support.v7.widget.LinearLayoutManager#findLastVisibleItemPosition()

The following examples show how to use android.support.v7.widget.LinearLayoutManager#findLastVisibleItemPosition() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: MainActivity.java From Synapse with Apache License 2.0

6 votes

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
    if (newState != RecyclerView.SCROLL_STATE_IDLE
            || !(recyclerView.getLayoutManager() instanceof LinearLayoutManager)
            || recyclerView.getChildCount() < AVAILABLE) {
        return;
    }

    final LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();

    final int totalItemCount = recyclerView.getAdapter().getItemCount();
    final int lastVisibleItemPosition = manager.findLastVisibleItemPosition();

    if (lastVisibleItemPosition == totalItemCount - 1) {
        mTrack.logEvent(TrackCons.Main.SCROLL_BOTTOM);
    }
}

Example 2

Source File: LayoutManagerItemVisibilityAssertion.java From espresso-macchiato with MIT License

6 votes

@Override
public void check(View view, NoMatchingViewException noViewFoundException) {
    if (noViewFoundException != null) {
        throw noViewFoundException;
    }

    RecyclerView recyclerView = (RecyclerView) view;
    if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        int firstVisibleItem = layoutManager.findFirstVisibleItemPosition();
        int lastVisibleItem = layoutManager.findLastVisibleItemPosition();

        boolean indexInRange = firstVisibleItem <= index && index <= lastVisibleItem;
        if ((shouldBeVisible && !indexInRange) || (!shouldBeVisible && indexInRange)) {
            String errorMessage = "expected item " + index + " to " +
                    (shouldBeVisible ? "" : "not") + " be visible, but was" +
                    (indexInRange ? "" : " not") + " visible";
            throw new AssertionError(errorMessage);

        }
    }
}

Example 3

Source File: SnappingRecyclerView.java From SnappyRecyclerView with MIT License

6 votes

/**
 * Calculates the distance between the RecyclerView's anchor, either the start, center or end,
 * and the View which is closest to the anchor.
 *
 * @return The distance between RecyclerView anchor and View closest to anchor
 */
private int calculateSnapDistance() {
    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) getLayoutManager();

    int parentAnchor = getParentAnchor(orientation, anchor);

    int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
    int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();

    View currentViewClosestToAnchor = linearLayoutManager.findViewByPosition(firstVisibleItemPosition);

    int currentViewClosestToAnchorDistance = parentAnchor - getViewAnchor(currentViewClosestToAnchor, orientation, anchor);

    for(int i = firstVisibleItemPosition + 1; i <= lastVisibleItemPosition; i++) {
        View view = linearLayoutManager.findViewByPosition(i);
        int distanceToAnchor = parentAnchor - getViewAnchor(view, orientation, anchor);

        if (Math.abs(distanceToAnchor) < Math.abs(currentViewClosestToAnchorDistance)) {
            currentViewClosestToAnchorDistance = distanceToAnchor;
        }
    }

    return currentViewClosestToAnchorDistance;
}

Example 4

Source File: RecyclerViewScrollActivity.java From AndroidDemo with MIT License

6 votes

private void moveToPosition(int position) {
    if (position > data.size())
        return;
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    int first = layoutManager.findFirstVisibleItemPosition();
    int end = layoutManager.findLastVisibleItemPosition();
    if (first == -1 || end == -1)
        return;
    if (position <= first) {
        layoutManager.scrollToPosition(position);
    } else if (position >= end) {
        isMove = true;
        scrollPosition = position;
        layoutManager.smoothScrollToPosition(recyclerView, null, position);
    } else {//中间部分
        int n = position - layoutManager.findFirstVisibleItemPosition();
        if (n > 0 && n < data.size()) {
            int top = layoutManager.findViewByPosition(position).getTop();
            recyclerView.scrollBy(0, top);
        }
    }
}

Example 5

Source File: NavigationFragment.java From MaoWanAndoidClient with Apache License 2.0

6 votes

private void moveToPosition(LinearLayoutManager layoutManager, RecyclerView recyclerView, int position) {
    // 第一个可见的view的位置
    int firstItem = layoutManager.findFirstVisibleItemPosition();
    // 最后一个可见的view的位置
    int lastItem = layoutManager.findLastVisibleItemPosition();
    if (position <= firstItem) {
        // 如果跳转位置firstItem 之前(滑出屏幕的情况)，就smoothScrollToPosition可以直接跳转，
        recyclerView.smoothScrollToPosition(position);
    } else if (position <= lastItem) {
        // 跳转位置在firstItem 之后，lastItem 之间（显示在当前屏幕），smoothScrollBy来滑动到指定位置
        int top = recyclerView.getChildAt(position - firstItem).getTop();
        recyclerView.smoothScrollBy(0, top);
    } else {
        // 如果要跳转的位置在lastItem 之后，则先调用smoothScrollToPosition将要跳转的位置滚动到可见位置
        // 再通过onScrollStateChanged控制再次调用当前moveToPosition方法，执行上一个判断中的方法
        recyclerView.smoothScrollToPosition(position);
        scrollToPosition = position;
        canScroll = true;
    }
}

Example 6

Source File: LMRecyclerView.java From WanAndroid with Apache License 2.0

6 votes

/**
 * 滑动监听
 * @param recyclerView
 * @param dx
 * @param dy
 */
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    LayoutManager layoutManager = recyclerView.getLayoutManager();

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayout = (LinearLayoutManager) layoutManager;
        int mLastChildPosition = linearLayout.findLastVisibleItemPosition();
        int itemTotalCount = linearLayout.getItemCount();
        View lastChildView = linearLayout.getChildAt(linearLayout.getChildCount() - 1);
        int lastChildBottom = lastChildView.getBottom();
        int recyclerBottom = getBottom();
        if (mLastChildPosition == itemTotalCount - 1 && lastChildBottom == recyclerBottom) {
            if (isCanLoadMore && listener != null) {
                //业务代码
                listener.loadMore();
            }
        }
    }
}

Example 7

Source File: EndlessScrollListener.java From BaseQuickAdapter with Apache License 2.0

5 votes

@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

    BaseQuickAdapter adapter = (BaseQuickAdapter) recyclerView.getAdapter();

    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
    if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItemPosition + 1 == layoutManager.getItemCount() && adapter.isHasMore()) {
        //当已经滑到最后一条的时候
        adapter.isLoadingMore();
    }
}

Example 8

Source File: SnappyRecyclerView.java From CustomViewSets with Apache License 2.0

5 votes

@Override
    public void onScrollStateChanged(int state) {
        super.onScrollStateChanged(state);

        // If you tap on the phone while the RecyclerView is scrolling it will stop in the middle.
        // This code fixes this. This code is not strictly necessary but it improves the behaviour.

        if (state == SCROLL_STATE_IDLE) {
            LinearLayoutManager linearLayoutManager = (LinearLayoutManager) getLayoutManager();

//            int screenWidth = Resources.getSystem().getDisplayMetrics().widthPixels;
            int screenWidth = getMeasuredWidth();
            // views on the screen
            int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
            View lastView = linearLayoutManager.findViewByPosition(lastVisibleItemPosition);
            int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
            View firstView = linearLayoutManager.findViewByPosition(firstVisibleItemPosition);

            // distance we need to scroll
            int leftMargin = (screenWidth - lastView.getWidth()) / 2;
            int rightMargin = (screenWidth - firstView.getWidth()) / 2 + firstView.getWidth();
            int leftEdge = lastView.getLeft();
            int rightEdge = firstView.getRight();
            int scrollDistanceLeft = leftEdge - leftMargin;
            int scrollDistanceRight = rightMargin - rightEdge;

            if (leftEdge > screenWidth / 2) {
                smoothScrollBy(-scrollDistanceRight, 0);
            } else if (rightEdge < screenWidth / 2) {
                smoothScrollBy(scrollDistanceLeft, 0);
            }
        }
    }

Example 9

Source File: ExpandableRecyclerView.java From Expandable-RecyclerView with Apache License 2.0

5 votes

@Override
public void run() {
	if (getLayoutManager() instanceof LinearLayoutManager && isFirstLayoutPassed() && getExpandableAdapter()!=null) {
		LinearLayoutManager layoutManager = (LinearLayoutManager) getLayoutManager();
		int first = layoutManager.findFirstVisibleItemPosition();
		int last = layoutManager.findLastVisibleItemPosition();
		getAdapter().notifyItemRangeChanged(first, last);
	}
}

Example 10

Source File: EndlessAdapter.java From SteamGifts with MIT License

5 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    if (layoutManager == null)
        throw new IllegalStateException("Can't handle scrolling without a LayoutManager");

    int lastVisibleItem = layoutManager.findLastVisibleItemPosition();

    if (!loading && layoutManager.getItemCount() <= (lastVisibleItem + 5)) {
        startLoading();
    }
}

Example 11

Source File: ListFragment.java From OpenHub with GNU General Public License v3.0

5 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    if(!loadMoreEnable || !canLoadMore || isLoading ||
            !NetHelper.INSTANCE.getNetEnabled()) return;
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    //only LinearLayoutManager can find last visible
    if(layoutManager instanceof LinearLayoutManager){
        LinearLayoutManager linearManager = (LinearLayoutManager) layoutManager;
        int lastPosition = linearManager.findLastVisibleItemPosition();
        if(lastPosition == adapter.getItemCount() - 1){
            onLoadMore(++curPage);
        }
    }
}

Example 12

Source File: GankListActivity.java From Gank-Veaer with GNU General Public License v3.0

5 votes

RecyclerView.OnScrollListener getScrollToBottomListener(final LinearLayoutManager linearLayoutManager) {
    return new RecyclerView.OnScrollListener() {
        @Override public void onScrolled(RecyclerView rv, int dx, int dy) {
            boolean isBottom = linearLayoutManager.findLastVisibleItemPosition() == (feedsList.size() - 1);
            if (!refreshLayout.isRefreshing() && isBottom) {
                refreshLayout.setRefreshing(true);
                nextPage++;
                initGankData(nextPage, false);
            }
        }
    };
}

Example 13

Source File: BaseRecyclerViewModel.java From Android-MVVMFramework with Apache License 2.0

5 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
    int totalItemCount = layoutManager.getItemCount();
    //lastVisibleItem >= totalItemCount - 1 表示剩下1个item自动加载
    // dy>0 表示向下滑动
    if (lastVisibleItem >= totalItemCount - 1 && dy > 0) {
        onListLoadMore();
    }
}

Example 14

Source File: SnappyRecyclerView.java From CustomViewSets with Apache License 2.0

4 votes

@Override
    public boolean fling(int velocityX, int velocityY) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) getLayoutManager();

//        int screenWidth = Resources.getSystem().getDisplayMetrics().widthPixels;
        int screenWidth = getMeasuredWidth();
        // views on the screen
        int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();
        View lastView = linearLayoutManager.findViewByPosition(lastVisibleItemPosition);
        int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
        View firstView = linearLayoutManager.findViewByPosition(firstVisibleItemPosition);

        // distance we need to scroll
        int leftMargin = (screenWidth - lastView.getWidth()) / 2;
        int rightMargin = (screenWidth - firstView.getWidth()) / 2 + firstView.getWidth();
        int leftEdge = lastView.getLeft();
        int rightEdge = firstView.getRight();
        int scrollDistanceLeft = leftEdge - leftMargin;
        int scrollDistanceRight = rightMargin - rightEdge;

        if (Math.abs(velocityX) < 1000) {
            // The fling is slow -> stay at the current page if we are less than half through,
            // or go to the next page if more than half through

            if (leftEdge > screenWidth / 2) {
                // go to next page
                smoothScrollBy(-scrollDistanceRight, 0);
            } else if (rightEdge < screenWidth / 2) {
                // go to next page
                smoothScrollBy(scrollDistanceLeft, 0);
            } else {
                // stay at current page
                if (velocityX > 0) {
                    smoothScrollBy(-scrollDistanceRight, 0);
                } else {
                    smoothScrollBy(scrollDistanceLeft, 0);
                }
            }
            return true;

        } else {
            // The fling is fast -> go to next page

            if (velocityX > 0) {
                smoothScrollBy(scrollDistanceLeft, 0);
            } else {
                smoothScrollBy(-scrollDistanceRight, 0);
            }
            return true;

        }

    }

Example 15

Source File: ScrollPageHelper.java From YCScrollPager with Apache License 2.0

4 votes

@Nullable
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int firstChild = reverseLayout ? linearLayoutManager.findLastVisibleItemPosition()
                : linearLayoutManager.findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }
        boolean endOfList;
        if (!reverseLayout) {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        } else {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition()
                    == 0;
        }

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(firstChild - offset)
                    : layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

Example 16

Source File: ScrollPageHelper.java From YCBanner with Apache License 2.0

4 votes

@Nullable
private View findStartView(RecyclerView.LayoutManager layoutManager,
                           @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int firstChild = reverseLayout ? linearLayoutManager.findLastVisibleItemPosition()
                : linearLayoutManager.findFirstVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (firstChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(firstChild);

        float visibleWidth;
        if (isRtlHorizontal) {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        }
        boolean endOfList;
        if (!reverseLayout) {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        } else {
            endOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition()
                    == 0;
        }

        if (visibleWidth > 0.5f && !endOfList) {
            return child;
        } else if (snapLastItem && endOfList) {
            return child;
        } else if (endOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(firstChild - offset)
                    : layoutManager.findViewByPosition(firstChild + offset);
        }
    }

    return null;
}

Example 17

Source File: BaseRefreshableListFragment.java From AndroidPlusJava with GNU General Public License v3.0

4 votes

private boolean shouldLoadMore() {
    LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
    return layoutManager.findLastVisibleItemPosition() == mRecyclerView.getAdapter().getItemCount() - 1;
}

Example 18

Source File: AutoLoadRecyclerView.java From the-tech-frontier-app with MIT License

4 votes

private boolean isBottom(int dx, int dy) {
    LinearLayoutManager layoutManager = (LinearLayoutManager) getLayoutManager();
    int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
    int totalItemCount = layoutManager.getItemCount();
    return lastVisibleItem >= totalItemCount - 4 && dy > 0;
}

Example 19

Source File: ScrollPageHelper.java From YCRefreshView with Apache License 2.0

4 votes

@Nullable
private View findEndView(RecyclerView.LayoutManager layoutManager,
                         @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int lastChild = reverseLayout ? linearLayoutManager.findFirstVisibleItemPosition()
                : linearLayoutManager.findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        boolean startOfList;
        if (!reverseLayout) {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition() == 0;
        } else {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        }

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(lastChild + offset)
                    : layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}

Example 20

Source File: ScrollPageHelper.java From YCScrollPager with Apache License 2.0

4 votes

@Nullable
private View findEndView(RecyclerView.LayoutManager layoutManager,
                         @NonNull OrientationHelper helper) {

    if (layoutManager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        boolean reverseLayout = linearLayoutManager.getReverseLayout();
        int lastChild = reverseLayout ? linearLayoutManager.findFirstVisibleItemPosition()
                : linearLayoutManager.findLastVisibleItemPosition();
        int offset = 1;

        if (layoutManager instanceof GridLayoutManager) {
            offset += ((GridLayoutManager) layoutManager).getSpanCount() - 1;
        }

        if (lastChild == RecyclerView.NO_POSITION) {
            return null;
        }

        View child = layoutManager.findViewByPosition(lastChild);

        float visibleWidth;

        if (isRtlHorizontal) {
            visibleWidth = (float) helper.getDecoratedEnd(child)
                    / helper.getDecoratedMeasurement(child);
        } else {
            visibleWidth = (float) (helper.getTotalSpace() - helper.getDecoratedStart(child))
                    / helper.getDecoratedMeasurement(child);
        }

        boolean startOfList;
        if (!reverseLayout) {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findFirstCompletelyVisibleItemPosition() == 0;
        } else {
            startOfList = ((LinearLayoutManager) layoutManager)
                    .findLastCompletelyVisibleItemPosition()
                    == layoutManager.getItemCount() - 1;
        }

        if (visibleWidth > 0.5f && !startOfList) {
            return child;
        } else if (snapLastItem && startOfList) {
            return child;
        } else if (startOfList) {
            return null;
        } else {
            return reverseLayout ? layoutManager.findViewByPosition(lastChild + offset)
                    : layoutManager.findViewByPosition(lastChild - offset);
        }
    }
    return null;
}