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

The following examples show how to use android.support.v7.widget.LinearLayoutManager#findFirstCompletelyVisibleItemPosition() . 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: HomeViewLayer.java    From demo4Fish with MIT License 6 votes vote down vote up 
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
    if (newState == RecyclerView.SCROLL_STATE_IDLE) {
        int count = mDotLayout.getChildCount();
        if (0 == count) {
            return;
        }

        LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
        int position = manager.findFirstCompletelyVisibleItemPosition() % count;
        for (int i = 0; i < count; i++) {
            View view = mDotLayout.getChildAt(i);
            if (i == position) {
                if (!view.isSelected()) {
                    view.setSelected(true);
                }
            } else {
                if (view.isSelected()) {
                    view.setSelected(false);
                }
            }
        }
    }
}
Example 2
Source File: CommentAdapter.java    From Hews with MIT License 6 votes vote down vote up 
public void collapseChildrenComment(int position) {
    ArrayList<Comment> childrenComments = new ArrayList<>();
    Comment parentComment = (Comment) mItemList.get(position);
    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
    // if a comment header is not visible when collapsing, scroll to it's header
    if (position != linearLayoutManager.findFirstCompletelyVisibleItemPosition()) {
        linearLayoutManager.scrollToPosition(position);
    }

    for (int curPosition = position + 1;
         (mItemList.get(curPosition) instanceof Comment
             && ((Comment) mItemList.get(curPosition)).getLevel() > parentComment.getLevel());
         curPosition++) {
        childrenComments.add((Comment) mItemList.get(curPosition));
    }

    if (!childrenComments.isEmpty()) {
        mCollapsedChildrenCommentsIndex.put(parentComment.getCommentId(), childrenComments);
        for (Comment comment : childrenComments) {
            mItemList.remove(comment);
        }
        notifyItemChanged(position);
        notifyItemRangeRemoved(position + 1, childrenComments.size());
    }
}
Example 3
Source File: MonthWeekMaterialCalendarView.java    From monthweekmaterialcalendarview with Apache License 2.0 5 votes vote down vote up 
/**
 * 判断线性布局的recyclerView是否到达顶部
 *
 * @param view
 */
private boolean isAtTop(View view) {
    boolean isTop = false;
    if (view instanceof RecyclerView) {
        if (((RecyclerView) view).getLayoutManager() instanceof ILayoutManager) {
            if (((RecyclerView) view).getLayoutManager() instanceof LinearLayoutManager) {
                LinearLayoutManager linearLayoutManager = (LinearLayoutManager) ((RecyclerView) view).getLayoutManager();
                if (linearLayoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
                    isTop = true;
                }
            }
            if (((RecyclerView) view).getLayoutManager() instanceof GridLayoutManager) {
                GridLayoutManager gridLayoutManager = (GridLayoutManager) ((RecyclerView) view).getLayoutManager();
                if (gridLayoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
                    isTop = true;
                }
            }
            if (((RecyclerView) view).getLayoutManager() instanceof StaggeredGridLayoutManager) {
                StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) ((RecyclerView) view).getLayoutManager();
                int[] positions = new int[staggeredGridLayoutManager.getSpanCount()];
                staggeredGridLayoutManager.findFirstVisibleItemPositions(positions);
                if (findMin(positions) == 0) {
                    isTop = true;
                }
            }
        } else {
            throw new IllegalArgumentException("RecyclerView layoutManager must implement ILayoutManager");
        }

    }
    return isTop;
}
Example 4
Source File: Utils.java    From ht-refreshrecyclerview with MIT License 5 votes vote down vote up 
/**
 * 获取第一个可见/完全可见item的位置索引
 * @param layoutManager       RecyclerView.LayoutManager对象
 * @param isCompletelyVisible 是否完全可见
 * @return item的索引
 */
public static int getFirstItemPosition(@NonNull RecyclerView.LayoutManager layoutManager, boolean isCompletelyVisible) {
    int firstVisibleItemPosition = -1;
    if (layoutManager instanceof LinearLayoutManager) { //GridLayoutManager继承LinearLayoutManager
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
        firstVisibleItemPosition = isCompletelyVisible ? linearLayoutManager.findFirstCompletelyVisibleItemPosition() : linearLayoutManager.findFirstVisibleItemPosition();
    } else if (layoutManager instanceof StaggeredGridLayoutManager) {
        StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
        int[] firstVisibleItemPositions = isCompletelyVisible ? staggeredGridLayoutManager.findFirstCompletelyVisibleItemPositions(null) : staggeredGridLayoutManager.findFirstVisibleItemPositions(null);
        if (firstVisibleItemPositions != null && firstVisibleItemPositions.length > 0)
            firstVisibleItemPosition = firstVisibleItemPositions[0];
    }
    return firstVisibleItemPosition;
}
Example 5
Source File: BounceTouchListener.java    From Bounce with Apache License 2.0 5 votes vote down vote up 
private boolean hasHitTop() {
    if (mMainView instanceof ScrollView) {
        ScrollView scrollView = (ScrollView) mMainView;
        return scrollView.getScrollY() == 0;
    } else if (mMainView instanceof ListView) {
        ListView listView = (ListView) mMainView;
        if (listView.getAdapter() != null) {
            if (listView.getAdapter().getCount() > 0) {
                return listView.getFirstVisiblePosition() == 0 &&
                        listView.getChildAt(0).getTop() >= 0;
            }
        }
    } else if (mMainView instanceof RecyclerView) {
        RecyclerView recyclerView = (RecyclerView) mMainView;
        if (recyclerView.getAdapter() != null && recyclerView.getLayoutManager() != null) {
            RecyclerView.Adapter adapter = recyclerView.getAdapter();
            if (adapter.getItemCount() > 0) {
                RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
                if (layoutManager instanceof LinearLayoutManager) {
                    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
                    return linearLayoutManager.findFirstCompletelyVisibleItemPosition() == 0;
                } else if (layoutManager instanceof StaggeredGridLayoutManager) {
                    StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
                    int[] checks = staggeredGridLayoutManager.findFirstCompletelyVisibleItemPositions(null);
                    for (int check : checks) {
                        if (check == 0)
                            return true;
                    }
                }
            }
        }
    }

    return false;
}
Example 6
Source File: TopScrollListener.java    From meiShi with Apache License 2.0 5 votes vote down vote up 
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    if (linearLayoutManager.findFirstCompletelyVisibleItemPosition() == 0) {
        hasPlay = true;
        start();
    } else if (hasPlay) {
        hasPlay = false;
        pause();
    }
}
Example 7
Source File: GravitySnapHelper.java    From SuntimesWidget with GNU General Public License v3.0 5 votes vote down vote up 
private boolean isAtEdgeOfList(LinearLayoutManager lm) {
    if ((!lm.getReverseLayout() && gravity == Gravity.START)
            || (lm.getReverseLayout() && gravity == Gravity.END)
            || (!lm.getReverseLayout() && gravity == Gravity.TOP)
            || (lm.getReverseLayout() && gravity == Gravity.BOTTOM)) {
        return lm.findLastCompletelyVisibleItemPosition() == lm.getItemCount() - 1;
    } else if (gravity == Gravity.CENTER) {
        return lm.findFirstCompletelyVisibleItemPosition() == 0
                || lm.findLastCompletelyVisibleItemPosition() == lm.getItemCount() - 1;
    } else {
        return lm.findFirstCompletelyVisibleItemPosition() == 0;
    }
}
Example 8
Source File: ScrollManager.java    From Mover with Apache License 2.0 4 votes vote down vote up 
public boolean isUserNeedInFastScrollUp(RecyclerView view){
    LinearLayoutManager manager = (LinearLayoutManager) view.getLayoutManager();
    return manager.findFirstCompletelyVisibleItemPosition() >= MIN_VISIBLE_ITEMS;
}