Java Code Examples for androidx.recyclerview.widget.LinearLayoutManager#findFirstVisibleItemPosition()

The following examples show how to use androidx.recyclerview.widget.LinearLayoutManager#findFirstVisibleItemPosition() . 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: SelectionHandler.java From dhis2-android-capture-app with BSD 3-Clause "New" or "Revised" License

6 votes

public void changeSelectionOfRecyclerView(CellRecyclerView recyclerView, AbstractViewHolder
        .SelectionState selectionState, @ColorInt int backgroundColor) {

    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView
            .getLayoutManager();

    for (int i = linearLayoutManager.findFirstVisibleItemPosition(); i < linearLayoutManager
            .findLastVisibleItemPosition() + 1; i++) {

        AbstractViewHolder viewHolder = (AbstractViewHolder) recyclerView
                .findViewHolderForAdapterPosition(i);

        if (viewHolder != null) {
            if (!mTableView.isIgnoreSelectionColors()) {
                // Change background color
                viewHolder.setBackgroundColor(backgroundColor);
            }

            // Change selection status of the view holder
            viewHolder.setSelected(selectionState);
        }
    }
}

Example 2

Source File: SearchFragment.java From hipda with GNU General Public License v2.0

6 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    if (dy > 0) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        visibleItemCount = layoutManager.getChildCount();
        totalItemCount = layoutManager.getItemCount();
        int firstVisibleItem = layoutManager.findFirstVisibleItemPosition();

        if ((visibleItemCount + firstVisibleItem) >= totalItemCount - 5) {
            if (!mInloading) {
                mInloading = true;
                if (mPage < mMaxPage) {
                    mPage++;
                    mRecyclerView.setFooterState(XFooterView.STATE_LOADING);
                    SimpleListJob job = new SimpleListJob(getActivity(), mSessionId, mType, mPage, mSearchBean);
                    JobMgr.addJob(job);
                } else {
                    mRecyclerView.setFooterState(XFooterView.STATE_END);
                }
            }
        }
    }
}

Example 3

Source File: ConversationFragment.java From deltachat-android with GNU General Public License v3.0

6 votes

private void manageMessageSeenState() {

        LinearLayoutManager layoutManager = (LinearLayoutManager)list.getLayoutManager();

        int firstPos = layoutManager.findFirstVisibleItemPosition();
        int lastPos = layoutManager.findLastVisibleItemPosition();
        if(firstPos == RecyclerView.NO_POSITION || lastPos == RecyclerView.NO_POSITION) {
            return;
        }

        int[] ids = new int[lastPos - firstPos + 1];
        int index = 0;
        for(int pos = firstPos; pos <= lastPos; pos++) {
            DcMsg message = ((ConversationAdapter) list.getAdapter()).getMsg(pos);
            if (message.getFromId() != DC_CONTACT_ID_SELF && !message.isSeen()) {
                ids[index] = message.getId();
                index++;
            }
        }
        dcContext.markseenMsgs(ids);
    }

Example 4

Source File: HorizontalRecyclerViewListener.java From TableView with MIT License

6 votes

/**
 * This method calculates the current scroll position and its offset to help new attached
 * recyclerView on window at that position and offset
 *
 * @see #getScrollPosition()
 * @see #getScrollPositionOffset()
 */
private void renewScrollPosition(@NonNull RecyclerView recyclerView) {
    LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
    mScrollPosition = layoutManager.findFirstCompletelyVisibleItemPosition();

    // That means there is no completely visible Position.
    if (mScrollPosition == -1) {
        mScrollPosition = layoutManager.findFirstVisibleItemPosition();

        // That means there is just a visible item on the screen
        if (mScrollPosition == layoutManager.findLastVisibleItemPosition()) {
            // in this case we use the position which is the last & first visible item.
        } else {
            // That means there are 2 visible item on the screen. However, second one is not
            // completely visible.
            mScrollPosition = mScrollPosition + 1;
        }
    }

    mScrollPositionOffset = layoutManager.findViewByPosition(mScrollPosition).getLeft();
}

Example 5

Source File: SelectionHandler.java From TableView with MIT License

6 votes

public void changeSelectionOfRecyclerView(CellRecyclerView recyclerView, @NonNull AbstractViewHolder
        .SelectionState selectionState, @ColorInt int backgroundColor) {

    LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView
            .getLayoutManager();

    for (int i = linearLayoutManager.findFirstVisibleItemPosition(); i < linearLayoutManager
            .findLastVisibleItemPosition() + 1; i++) {

        AbstractViewHolder viewHolder = (AbstractViewHolder) recyclerView
                .findViewHolderForAdapterPosition(i);

        if (viewHolder != null) {
            if (!mTableView.isIgnoreSelectionColors()) {
                // Change background color
                viewHolder.setBackgroundColor(backgroundColor);
            }

            // Change selection status of the view holder
            viewHolder.setSelected(selectionState);
        }
    }
}

Example 6

Source File: CommentListingFragment.java From RedReader with GNU General Public License v3.0

6 votes

public void handleCommentVisibilityToggle(final RedditCommentView view) {

		final RedditChangeDataManager changeDataManager = RedditChangeDataManager.getInstance(mUser);
		final RedditCommentListItem item = view.getComment();

		if(item.isComment()) {
			final RedditRenderableComment comment = item.asComment();

			changeDataManager.markHidden(
					RRTime.utcCurrentTimeMillis(),
					comment,
					!comment.isCollapsed(changeDataManager));

			mCommentListingManager.updateHiddenStatus();

			final LinearLayoutManager layoutManager = (LinearLayoutManager)mRecyclerView.getLayoutManager();
			final int position = layoutManager.getPosition(view);

			if(position == layoutManager.findFirstVisibleItemPosition()) {
				layoutManager.scrollToPositionWithOffset(position, 0);
			}
		}
	}

Example 7

Source File: ThreadListFragment.java From hipda with GNU General Public License v2.0

6 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    if (dy > 0) {
        LinearLayoutManager mLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        visibleItemCount = mLayoutManager.getChildCount();
        totalItemCount = mLayoutManager.getItemCount();
        mFirstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();

        if ((visibleItemCount + mFirstVisibleItem) >= totalItemCount - 5) {
            if (!mInloading) {
                mPage++;
                mInloading = true;
                mRecyclerView.setFooterState(XFooterView.STATE_LOADING);
                ThreadListJob job = new ThreadListJob(getActivity(), mSessionId, mForumId, mPage);
                JobMgr.addJob(job);
            }
        }
    }
}

Example 8

Source File: UserinfoFragment.java From hipda with GNU General Public License v2.0

5 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    if (dy > 0) {
        LinearLayoutManager mLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        visibleItemCount = mLayoutManager.getChildCount();
        totalItemCount = mLayoutManager.getItemCount();
        int firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();

        if ((visibleItemCount + firstVisibleItem) >= totalItemCount - 5) {
            if (!mInloading) {
                mInloading = true;
                if (mPage < mMaxPage) {
                    mPage++;
                    mRecyclerView.setFooterState(XFooterView.STATE_LOADING);
                    SearchBean bean = new SearchBean();
                    bean.setUid(mUid);
                    bean.setSearchId(mSearchId);
                    SimpleListJob job = new SimpleListJob(UserinfoFragment.this.getActivity(), mSessionId,
                            SimpleListJob.TYPE_SEARCH_USER_THREADS,
                            mPage,
                            bean);
                    JobMgr.addJob(job);
                } else {
                    mRecyclerView.setFooterState(XFooterView.STATE_END);
                }
            }
        }
    }
}

Example 9

Source File: ScrollPositionListener.java From Hentoid with Apache License 2.0

5 votes

@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);

    LinearLayoutManager llm = (LinearLayoutManager) recyclerView.getLayoutManager();
    if (llm != null) {
        int firstVisibleItemPosition = llm.findFirstVisibleItemPosition();
        int lastCompletelyVisibleItemPosition = llm.findLastCompletelyVisibleItemPosition();
        onPositionChangeListener.accept(Math.max(firstVisibleItemPosition, lastCompletelyVisibleItemPosition));
    }
}

Example 10

Source File: ZoomableRecyclerView.java From Hentoid with Apache License 2.0

5 votes

@Override
public void onScrolled(int dx, int dy) {
    super.onScrolled(dx, dy);
    LinearLayoutManager layoutManager = (LinearLayoutManager) getLayoutManager();
    if (layoutManager != null) {
        lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
        firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();
    }
}

Example 11

Source File: VideoTrimmerView.java From Android-Video-Trimmer with Apache License 2.0

5 votes

/**
 * 水平滑动了多少px
 */
private int calcScrollXDistance() {
  LinearLayoutManager layoutManager = (LinearLayoutManager) mVideoThumbRecyclerView.getLayoutManager();
  int position = layoutManager.findFirstVisibleItemPosition();
  View firstVisibleChildView = layoutManager.findViewByPosition(position);
  int itemWidth = firstVisibleChildView.getWidth();
  return (position) * itemWidth - firstVisibleChildView.getLeft();
}

Example 12

Source File: AsyncAdapter.java From financisto with GNU General Public License v2.0

5 votes

@Override
public void getItemRangeInto(int[] outRange) {
    if (outRange == null) {
        return;
    }
    if(recyclerView.getLayoutManager() instanceof LinearLayoutManager){
        LinearLayoutManager llm = (LinearLayoutManager) recyclerView.getLayoutManager();
        outRange[0] = llm.findFirstVisibleItemPosition();
        outRange[1] = llm.findLastVisibleItemPosition();
    }
    if (outRange[0] == -1 && outRange[1] == -1) {
        outRange[0] = 0;
        outRange[1] = 0;
    }
}

Example 13

Source File: HorizontalScrollCompat.java From SmoothRefreshLayout with MIT License

5 votes

public static boolean canAutoRefresh(View view) {
    if (ViewCatcherUtil.isRecyclerView(view)) {
        RecyclerView recyclerView = (RecyclerView) view;
        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
        if (manager == null) {
            return false;
        }
        int firstVisiblePosition = -1;
        if (manager instanceof LinearLayoutManager) {
            LinearLayoutManager linearManager = ((LinearLayoutManager) manager);
            if (linearManager.getOrientation() != RecyclerView.HORIZONTAL) {
                return false;
            }
            firstVisiblePosition = linearManager.findFirstVisibleItemPosition();
        } else if (manager instanceof StaggeredGridLayoutManager) {
            StaggeredGridLayoutManager gridLayoutManager = (StaggeredGridLayoutManager) manager;
            if (gridLayoutManager.getOrientation() != RecyclerView.HORIZONTAL) {
                return false;
            }
            int[] firstPositions = new int[gridLayoutManager.getSpanCount()];
            gridLayoutManager.findFirstVisibleItemPositions(firstPositions);
            for (int value : firstPositions) {
                if (value == 0) {
                    firstVisiblePosition = 0;
                    break;
                }
            }
        }
        RecyclerView.Adapter adapter = recyclerView.getAdapter();
        return adapter != null && firstVisiblePosition == 0;
    }
    return false;
}

Example 14

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

5 votes

@Override
public void onScrolled(final RecyclerView mRecyclerView, final int dx, final int dy) {
	super.onScrolled(mRecyclerView, dx, dy);
	final LinearLayoutManager mLayoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();

	visibleItemCount = mRecyclerView.getChildCount();
	totalItemCount = mLayoutManager.getItemCount();
	firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
	onScroll(firstVisibleItem, visibleItemCount, totalItemCount);
}

Example 15

Source File: GamesTutorial.java From PretendYoureXyzzyAndroid with GNU General Public License v3.0

5 votes

public final boolean buildSequence(@NonNull View createGame, @NonNull RecyclerView list) {
    LinearLayoutManager llm = (LinearLayoutManager) list.getLayoutManager();
    if (llm == null) return false;

    int pos = llm.findFirstVisibleItemPosition();
    if (pos == -1) return false;

    GamesAdapter.ViewHolder holder = (GamesAdapter.ViewHolder) list.findViewHolderForLayoutPosition(pos);
    if (holder != null) {
        add(forView(holder.status, R.string.tutorial_gameStatus)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.locked, R.string.tutorial_gameLocked)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.spectate, R.string.tutorial_spectateGame)
                .focusShape(FocusShape.ROUNDED_RECTANGLE)
                .roundRectRadius(8)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(holder.join, R.string.tutorial_joinGame)
                .focusShape(FocusShape.ROUNDED_RECTANGLE)
                .roundRectRadius(8)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        add(forView(createGame, R.string.tutorial_createGame)
                .focusShape(FocusShape.CIRCLE)
                .enableAutoTextPosition()
                .fitSystemWindows(true));
        return true;
    }

    return false;
}

Example 16

Source File: StickyItemDecoration.java From AndroidAnimationExercise with Apache License 2.0

4 votes

@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
    super.onDrawOver(c, parent, state);

    if (parent.getAdapter().getItemCount() <= 0) return;

    mLayoutManager = (LinearLayoutManager) parent.getLayoutManager();
    mCurrentUIFindStickView = false;

    for (int m = 0, size = parent.getChildCount(); m < size; m++) {
        View view = parent.getChildAt(m);

        /**
         * 如果是吸附的view
         */
        if (mStickyView.isStickyView(view)) {
            mCurrentUIFindStickView = true;
            getStickyViewHolder(parent);
            cacheStickyViewPosition(m);

            if (view.getTop() <= 0) {
                bindDataForStickyView(mLayoutManager.findFirstVisibleItemPosition(), parent.getMeasuredWidth());
            } else {
                if (mStickyPositionList.size() > 0) {
                    if (mStickyPositionList.size() == 1) {
                        bindDataForStickyView(mStickyPositionList.get(0), parent.getMeasuredWidth());
                    } else {
                        int currentPosition = getStickyViewPositionOfRecyclerView(m);
                        int indexOfCurrentPosition = mStickyPositionList.lastIndexOf(currentPosition);
                        if (indexOfCurrentPosition >= 1) bindDataForStickyView(mStickyPositionList.get(indexOfCurrentPosition - 1), parent.getMeasuredWidth());
                    }
                }
            }

            if (view.getTop() > 0 && view.getTop() <= mStickyItemViewHeight) {
                mStickyItemViewMarginTop = mStickyItemViewHeight - view.getTop();
            } else {
                mStickyItemViewMarginTop = 0;

                View nextStickyView = getNextStickyView(parent);
                if (nextStickyView != null && nextStickyView.getTop() <= mStickyItemViewHeight) {
                    mStickyItemViewMarginTop = mStickyItemViewHeight - nextStickyView.getTop();
                }

            }

            drawStickyItemView(c);
            break;
        }
    }

    if (!mCurrentUIFindStickView) {
        mStickyItemViewMarginTop = 0;
        if (mLayoutManager.findFirstVisibleItemPosition() + parent.getChildCount() == parent.getAdapter().getItemCount() && mStickyPositionList.size() > 0) {
            bindDataForStickyView(mStickyPositionList.get(mStickyPositionList.size() - 1), parent.getMeasuredWidth());
        }
        drawStickyItemView(c);
    }
}

Example 17

Source File: BackToTopUtils.java From Mysplash with GNU Lesser General Public License v3.0

4 votes

private static int getFirstVisibleItemPosition(LinearLayoutManager manager) {
    return manager.findFirstVisibleItemPosition();
}

Example 18

Source File: RecyclerViewStickyHeadItemDecoration.java From RecyclerViewDecoration with Apache License 2.0

4 votes

@Override
public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
    super.onDrawOver(c, parent, state);

    if (parent ==null || parent.getAdapter() == null || parent.getAdapter().getItemCount() == 0
            || parent.getLayoutManager() == null) {
        return;
    }

    if (parent.getLayoutManager() instanceof LinearLayoutManager) {
        LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();

        boolean findStickView = false;

        int itemCount = parent.getChildCount();
        for (int i = 0; i < itemCount; i++) {
            View view = parent.getChildAt(i);

            if (isGroupViewType(parent.getChildAdapterPosition(view))) {
                findStickView = true;
                if (mCurrentStickyViewHolder == null) {
                    mCurrentStickyViewHolder = parent.getAdapter().onCreateViewHolder(parent, mGroupViewType);
                    mStickyView = mCurrentStickyViewHolder.itemView;
                }
                if (view.getTop() <= 0) {
                    bindDataForStickyView(layoutManager.findFirstVisibleItemPosition());
                } else {
                    if (mStickyPositionList.size() > 0) {
                        if (mStickyPositionList.size() == 1) {
                            bindDataForStickyView(mStickyPositionList.get(0));
                        } else {
                            int currentPosition = layoutManager.findFirstVisibleItemPosition() + i;
                            int indexOfCurrentPosition = mStickyPositionList.lastIndexOf(currentPosition);
                            bindDataForStickyView(mStickyPositionList.get(indexOfCurrentPosition - 1));
                        }
                    }
                }

                if (view.getTop() > 0 && view.getTop() <= mStickyViewHeight) {
                    mStickyViewMarginTop = mStickyViewHeight - view.getTop();
                } else {
                    mStickyViewMarginTop = 0;

                    View nextStickyView = getNextStickyView();
                    if (nextStickyView != null && nextStickyView.getTop() <= mStickyViewHeight) {
                        mStickyViewMarginTop = mStickyViewHeight - nextStickyView.getTop();
                    }

                }

                drawStickyView(c);
                break;
            }
        }

        if (!findStickView) {
            mStickyViewMarginTop = 0;
            if (layoutManager.findFirstVisibleItemPosition() + parent.getChildCount() == parent.getAdapter().getItemCount()
                    && mStickyPositionList.size() > 0) {
                bindDataForStickyView(mStickyPositionList.get(mStickyPositionList.size() - 1));
            }
            drawStickyView(c);
        }
    } else {
        try {
            throw new IllegalAccessException("Only support RecyclerView LinearLayoutManager.VERTICAL");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

Example 19

Source File: ScrollPositionListener.java From Hentoid with Apache License 2.0

4 votes

@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
    super.onScrollStateChanged(recyclerView, newState);
    if (!Preferences.isViewerSwipeToTurn() || !isScrollEnabled) {
        recyclerView.stopScroll();
        return;
    }

    LinearLayoutManager llm = (LinearLayoutManager) recyclerView.getLayoutManager();
    if (llm != null) {
        if (RecyclerView.SCROLL_STATE_DRAGGING == newState) {
            dragStartPositionX = recyclerView.computeHorizontalScrollOffset();
            dragStartPositionY = recyclerView.computeVerticalScrollOffset();
            isSettlingX = false;
            isSettlingY = false;
        } else if (RecyclerView.SCROLL_STATE_SETTLING == newState) {
            // If the settling position is different from the original position, ignore that scroll
            // (e.g. snapping back to the original position after a small scroll)
            if (recyclerView.computeHorizontalScrollOffset() != dragStartPositionX)
                isSettlingX = true;
            if (recyclerView.computeVerticalScrollOffset() != dragStartPositionY)
                isSettlingY = true;
        } else if (RecyclerView.SCROLL_STATE_IDLE == newState) {
            // Don't do anything if we're not on a boundary
            if (!(llm.findLastVisibleItemPosition() == llm.getItemCount() - 1 || 0 == llm.findFirstVisibleItemPosition()))
                return;

            if (recyclerView.computeHorizontalScrollOffset() == dragStartPositionX && !isSettlingX && llm.canScrollHorizontally()) {
                if (0 == dragStartPositionX && !llm.getReverseLayout())
                    onStartOutOfBoundScroll.run();
                else if (0 == dragStartPositionX) onEndOutOfBoundScroll.run();
                else if (llm.getReverseLayout()) onStartOutOfBoundScroll.run();
                else onEndOutOfBoundScroll.run();
            }
            if (recyclerView.computeVerticalScrollOffset() == dragStartPositionY && !isSettlingY && llm.canScrollVertically()) {
                if (0 == dragStartPositionY && !llm.getReverseLayout())
                    onStartOutOfBoundScroll.run();
                else if (0 == dragStartPositionY) onEndOutOfBoundScroll.run();
                else if (llm.getReverseLayout()) onStartOutOfBoundScroll.run();
                else onEndOutOfBoundScroll.run();
            }
        }
    }
}

Example 20

Source File: AlScrollListener.java From Applozic-Android-SDK with BSD 3-Clause "New" or "Revised" License

4 votes

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);

    RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();

    visibleItemCount = recyclerView.getChildCount();
    if (manager instanceof GridLayoutManager) {
        GridLayoutManager gridLayoutManager = (GridLayoutManager) manager;
        firstVisibleItem = gridLayoutManager.findFirstVisibleItemPosition();
        totalItemCount = gridLayoutManager.getItemCount();
    } else if (manager instanceof LinearLayoutManager) {
        LinearLayoutManager linearLayoutManager = (LinearLayoutManager) manager;
        firstVisibleItem = linearLayoutManager.findFirstVisibleItemPosition();
        totalItemCount = linearLayoutManager.getItemCount();
    }


    if (infiniteScrollingEnabled) {
        if (loading) {
            if (totalItemCount > previousTotal) {
                loading = false;
                previousTotal = totalItemCount;
            }
        }

        if ((totalItemCount - visibleItemCount) == 0) {
            return;
        }


        if (!loading && (totalItemCount - visibleItemCount <= firstVisibleItem + visibleThreshold)) {
            // End has been reached
            // do something
            onLoadMore();
            loading = true;
        }
    }

    if (firstVisibleItem == 0) {
        if (!controlsVisible) {
            onScrollUp();
            controlsVisible = true;
        }

        return;
    }

    if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
        onScrollDown();
        controlsVisible = false;
        scrolledDistance = 0;
    } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
        onScrollUp();
        controlsVisible = true;
        scrolledDistance = 0;
    }

    if ((controlsVisible && dy > 0) || (!controlsVisible && dy < 0)) {
        scrolledDistance += dy;
    }
}