Java Code Examples for androidx.recyclerview.widget.GridLayoutManager#setSpanSizeLookup()

private void setupRecyclerView() {
    GridLayoutManager gridLayoutManager = (GridLayoutManager) grid.getLayoutManager();
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            /* emulating https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B6Okdz75tqQsck9lUkgxNVZza1U/style_imagery_integration_scale1.png */
            switch (position % 6) {
                case 5:
                    return 3;
                case 3:
                    return 2;
                default:
                    return 1;
            }
        }
    });
    grid.addItemDecoration(new GridMarginDecoration(
            getResources().getDimensionPixelSize(R.dimen.grid_item_spacing)));
    grid.setHasFixedSize(true);

}
 

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView)
{
    RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
    if (manager instanceof GridLayoutManager)
    {
        final GridLayoutManager gridManager = ((GridLayoutManager) manager);
        gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup()
        {
            @Override
            public int getSpanSize(int position)
            {
                if (isInHeadViewPos(position)
                        || isInSectionLabelPos(position)
                        || isInFootViewPos(position)
                        || isInLoadMorePos(position)
                        || isInEmptyStatus())
                    return gridManager.getSpanCount();
                else
                    return 1;
            }
        });
        gridManager.setSpanCount(gridManager.getSpanCount());
    }
}
 

@Override
protected GridLayoutManager createNewGridLayoutManager() {
    GridLayoutManager gridLayoutManager = new SmoothScrollGridLayoutManager(getActivity(), mColumnCount);
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            // NOTE: If you use simple integers to identify the ViewType,
            // here, you should use them and not Layout integers
            switch (mAdapter.getItemViewType(position)) {
                case R.layout.recycler_scrollable_expandable_item:
                case R.layout.recycler_scrollable_header_item:
                case R.layout.recycler_scrollable_footer_item:
                case R.layout.recycler_scrollable_layout_item:
                case R.layout.recycler_scrollable_uls_item:
                case R.layout.progress_item:
                    return mColumnCount;
                default:
                    return 1;
            }
        }
    });
    return gridLayoutManager;
}
 

private void setupRecyclerView() {
    GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3);
    grid.setLayoutManager(gridLayoutManager);
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            /* emulating https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B6Okdz75tqQsck9lUkgxNVZza1U/style_imagery_integration_scale1.png */
            switch (position % 6) {
                case 5:
                    return 3;
                case 3:
                    return 2;
                default:
                    return 1;
            }
        }
    });
    grid.addItemDecoration(new GridMarginDecoration(
            getResources().getDimensionPixelSize(
                    com.example.android.unsplash.R.dimen.grid_item_spacing)));
    grid.setHasFixedSize(true);

}
 

@Override
protected GridLayoutManager createNewGridLayoutManager() {
    GridLayoutManager gridLayoutManager = new SmoothScrollGridLayoutManager(getActivity(), mColumnCount);
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            // NOTE: If you use simple integers to identify the ViewType,
            // here, you should use them and not Layout integers
            switch (mAdapter.getItemViewType(position)) {
                case R.layout.recycler_scrollable_layout_item:
                case R.layout.recycler_scrollable_uls_item:
                case R.layout.recycler_header_item:
                case R.layout.recycler_expandable_header_item:
                case R.layout.recycler_expandable_item:
                    return mColumnCount;
                default:
                    return 1;
            }
        }
    });
    return gridLayoutManager;
}
 

@Override
public void onAttachedToRecyclerView(final RecyclerView recyclerView) {
    this.display = recyclerView;
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager instanceof GridLayoutManager) {
        final GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
        final GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                BaseRecyclerAdapter wrapperAdapter = (BaseRecyclerAdapter) recyclerView.getAdapter();
                if (isFullSpanType(wrapperAdapter.getItemViewType(position))) {
                    return gridLayoutManager.getSpanCount();
                } else if (spanSizeLookup != null) {
                    return spanSizeLookup.getSpanSize(position - getItemUpCount());
                }
                return 1;
            }
        });
    }
}
 

/**
 * Sets full span for the positions in case of a {@link GridLayoutManager}.
 * This method must be called after setting an adapter for the recycler view.
 *
 * @param recyclerView The recycler view to set the span size.
 * @param positions The positions supported by the recycler view.
 * @param spanCount The maximum span supported by the layout manager.
 *
 * @see GridLayoutManager#setSpanSizeLookup(GridLayoutManager.SpanSizeLookup)
 */
public static void setFullSpanForPosition(@Nullable final RecyclerView recyclerView,
        @NonNull final Integer[] positions, int spanCount) {
    if (recyclerView == null || recyclerView.getAdapter() == null) {
        return;
    }

    if (recyclerView.getLayoutManager() instanceof GridLayoutManager) {
        final GridLayoutManager layoutManager =
                (GridLayoutManager) recyclerView.getLayoutManager();
        layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                if (Arrays.asList(positions).contains(position)) {
                    return Math.min(Math.abs(spanCount - position % spanCount), spanCount);
                } else {
                    return 1;
                }
            }
        });
    }
}
 

@Bindable
public RecyclerView.LayoutManager getLayoutManager() {
    mColumnCount = ViewUtils.getNumberOfGridColumns(getContext(), R.dimen.grid_width);
    GridLayoutManager layoutManager = new GridLayoutManager(getContext(), mColumnCount);

    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            if (getAdapter().getItemViewType(position) == mAlbumSection.getTypeId()) {
                return 1;
            } else {
                return mColumnCount;
            }
        }
    });

    return layoutManager;
}
 

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
    RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

    if (layoutManager instanceof GridLayoutManager) {
        GridLayoutManager gridLayoutManager = ((GridLayoutManager) layoutManager);
        if (mGridSpanSizeLookup == null) {
            mSpanCount = gridLayoutManager.getSpanCount();
            mGridSpanSizeLookup = getGridSpanSizeLookup();
        }
        gridLayoutManager.setSpanSizeLookup(mGridSpanSizeLookup);
    }
}
 

@Override
public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
    RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
    if (manager instanceof GridLayoutManager) {
        final GridLayoutManager gridManager = ((GridLayoutManager) manager);
        gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                int type = getItemViewType(position);
                /**
                 * 根据GridLayoutManager的getSpanSize方法可以动态的设置item跨列数
                 * 需要设置：4个参数的GridLayoutManager
                 * new GridLayoutManager(getActivity(),6,GridLayoutManager.VERTICAL,false);
                 * 这里的6（自己设置的最好设置成偶数）就相当于分母，6默认显示一整行（1列），下面的3 和2 就相当于分子，返回3就是（1/2）所以此类型对应的是2列，返回2就是（1/3）所以此类型对应的是3列
                 * */
                switch (type) {
                    case StickyHeaderHandler.TYPE_STICKY_VIEW:
                        // title栏显示一列
                        return gridManager.getSpanCount();
                    case TYPE_CONTENT:
                        // 内容栏显示2列
                        return 3;
                    default:
                        //默认显示2列
                        return 3;
                }
            }
        });
    }
}
 

private GridLayoutManager getGridLayoutManager(RecyclerView recyclerView) {
    final int columns = getRecyclerColumnCount();
    GridLayoutManager gridLayoutManager = new GridLayoutManager(context, columns);

    GridLayoutManager.SpanSizeLookup spanSizeLookup = getSpanSizeLookup(gridLayoutManager);
    if (spanSizeLookup != null) {
        gridLayoutManager.setSpanSizeLookup(spanSizeLookup);
    }
    RecyclerView.ItemDecoration itemDecoration = getItemDecoration();
    recyclerView.addItemDecoration(itemDecoration);
    return gridLayoutManager;
}
 

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    userImg = mRootView.findViewById(R.id.img);
    formsList = mRootView.findViewById(R.id.recycler_view);
    formsList.setClipToPadding(false);
    formsList.setPadding(0, 0, 0, (int) getResources().getDimension(R.dimen.bottombarHeight));
    mRootView.findViewById(R.id.search).setOnClickListener(this);
    adapter = new ForumsAdapter(getActivity());

    int spanCount = Math.max(4, DimenUtils.px2dip(getResources(), Resources.getSystem().getDisplayMetrics().widthPixels) / 75);

    GridLayoutManager layoutManager = new GridLayoutManager(getActivity(), spanCount);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            int type = adapter.getItemViewType(position);
            if (type == ForumsAdapter.TYPE_HEADER || type == ForumsAdapter.TYPE_WATER) {
                return spanCount;
            } else {
                // 4 / 1 = 4 列
                return 1;
            }
        }
    });
    userImg.setOnClickListener(this);
    formsList.setLayoutManager(layoutManager);
    formsList.setAdapter(adapter);
    return mRootView;
}
 

@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_library_page, container, false);
    mRecyclerView = view.findViewById(R.id.library_page_list);

    int numColumns = ViewUtils.getNumberOfGridColumns(getActivity(), R.dimen.grid_width);

    GridLayoutManager layoutManager = new GridLayoutManager(getActivity(), numColumns);
    layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return mAlbums.isEmpty() ? numColumns : 1;
        }
    });
    mRecyclerView.setLayoutManager(layoutManager);

    mRecyclerView.addItemDecoration(new BackgroundDecoration());
    mRecyclerView.addItemDecoration(new GridSpacingDecoration(
            (int) getResources().getDimension(R.dimen.grid_margin), numColumns));

    if (mAdapter == null) {
        setupAdapter();
    } else {
        mRecyclerView.setAdapter(mAdapter);
    }

    int paddingH = (int) getActivity().getResources().getDimension(R.dimen.global_padding);
    view.setPadding(paddingH, 0, paddingH, 0);

    return view;
}
 

private void createLayoutManager() {
  layoutManager = new GridLayoutManager(this, GRID_SPAN_COUNT);

  layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
    @Override public int getSpanSize(int position) {
      return adapter.isSection(position) ? GRID_SPAN_COUNT : 1;
    }
  });
}
 

@Nullable
@Override
public View onCreateView(@NonNull final LayoutInflater inflater, @Nullable final ViewGroup container,
                         @Nullable final Bundle savedInstanceState) {

    final View view = inflater.inflate(R.layout.fragment_ex5, container, false);

    sectionedAdapter = new SectionedRecyclerViewAdapter();

    final LoadMoviesUseCase loadMoviesUseCase = new LoadMoviesUseCase();
    sectionedAdapter.addSection(new MovieSection(getString(R.string.top_rated_movies_topic),
            loadMoviesUseCase.execute(requireContext(), R.array.top_rated_movies), this));
    sectionedAdapter.addSection(new MovieSection(getString(R.string.most_popular_movies_topic),
            loadMoviesUseCase.execute(requireContext(), R.array.most_popular_movies), this));

    final RecyclerView recyclerView = view.findViewById(R.id.recyclerview);

    final GridLayoutManager glm = new GridLayoutManager(getContext(), 2);
    glm.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(final int position) {
            if (sectionedAdapter.getSectionItemViewType(position) == SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER) {
                return 2;
            }
            return 1;
        }
    });
    recyclerView.setLayoutManager(glm);
    recyclerView.setAdapter(sectionedAdapter);

    return view;
}
 

public void setGridLayoutManager(GridLayoutManager gridLayoutManager) {
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            TimelineItem timelineItem = getItem(position);

            // If we have a header item, occupy the entire width
            if (timelineItem.getTimelineType() == TimelineItem.TYPE_HEADER)
                return timelineGridSize;

            // Else, a media item takes up a single space
            return 1;
        }
    });
}
 

@Override
protected GridLayoutManager createNewGridLayoutManager() {
    mAdapter.setAnimationEntryStep(false);
    GridLayoutManager gridLayoutManager = new SmoothScrollGridLayoutManager(getActivity(), mColumnCount);
    gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            return mAdapter.getItem(position).getSpanSize(mColumnCount, position);
        }
    });
    return gridLayoutManager;
}
 

private void setupListAdapter() {
    RecyclerView recyclerView = getActivity().findViewById(R.id.rv_movie_list);
    final DiscoverMoviesAdapter discoverMoviesAdapter =
            new DiscoverMoviesAdapter(viewModel);
    final GridLayoutManager layoutManager =
            new GridLayoutManager(getActivity(), getResources().getInteger(R.integer.span_count));

    // draw network status and errors messages to fit the whole row(3 spans)
    layoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            switch (discoverMoviesAdapter.getItemViewType(position)) {
                case R.layout.item_network_state:
                    return layoutManager.getSpanCount();
                default:
                    return 1;
            }
        }
    });

    // setup recyclerView
    recyclerView.setAdapter(discoverMoviesAdapter);
    recyclerView.setLayoutManager(layoutManager);
    ItemOffsetDecoration itemDecoration = new ItemOffsetDecoration(getActivity(), R.dimen.item_offset);
    recyclerView.addItemDecoration(itemDecoration);

    // observe paged list
    viewModel.getPagedList().observe(getViewLifecycleOwner(), new Observer<PagedList<Movie>>() {
        @Override
        public void onChanged(PagedList<Movie> movies) {
            discoverMoviesAdapter.submitList(movies);
        }
    });

    // observe network state
    viewModel.getNetworkState().observe(getViewLifecycleOwner(), new Observer<Resource>() {
        @Override
        public void onChanged(Resource resource) {
            discoverMoviesAdapter.setNetworkState(resource);
        }
    });
}
 

@Nullable
	@Override
	public View onCreateView(final LayoutInflater inflater,
	                         @Nullable final ViewGroup container,
	                         @Nullable final Bundle savedInstanceState) {

		final View view = inflater.inflate(R.layout.fragment_list, container, false);

		mAdapter = new RendererRecyclerViewAdapter();
		mAdapter.enableDiffUtil();


//		mAdapter.setLoadMoreModel(new YourLoadMoreModel()); /* you can change the LoadMoreModel if needed */
		mAdapter.registerRenderer(new LoadMoreViewBinder(R.layout.item_load_more));
		mAdapter.registerRenderer(new ViewBinder<>(R.layout.item_simple_square, SimpleViewModel.class,
				(model, finder, payloads) -> finder.setText(R.id.text, model.getText())
		));
//		adapter.registerRenderer(...);
//		adapter.registerRenderer(...);

		mAdapter.setItems(mYourDataProvider.getLoadMoreItems());

		mLayoutManager = new GridLayoutManager(getContext(), COLUMNS_COUNT);
		mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
			@Override
			public int getSpanSize(final int position) {
				final Type type = mAdapter.getType(position);
				if (type.equals(SimpleViewModel.class)) {
					return 1;
				}
				return COLUMNS_COUNT;
			}
		});

		mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
		mRecyclerView.setAdapter(mAdapter);
		mRecyclerView.setLayoutManager(mLayoutManager);
		mRecyclerView.addItemDecoration(new ItemOffsetDecoration(10));
		mRecyclerView.addOnScrollListener(new EndlessScrollListener() {
			@Override
			public void onLoadMore(final int page, final int totalItemsCount) {
				Log.d("#####", "onLoadMore " + page);
				mAdapter.showLoadMore();
//				mAdapter.hideLoadMore(); /* if you need force hide progress or call setItems() */
				mYourDataProvider.getLoadMoreItems(list -> getActivity().runOnUiThread(() -> mAdapter.setItems(list)));
			}
		});

		return view;
	}
 

private void initView() {

        if (albumModel.getAlbumItems().isEmpty()) {
            Toast.makeText(this, R.string.no_photos_easy_photos, Toast.LENGTH_LONG).show();
            if (Setting.isShowCamera) {
                launchCamera(Code.REQUEST_CAMERA);
            } else {
                finish();
            }
            return;
        }

        EasyPhotos.setAdListener(this);
        if (Setting.hasPhotosAd()) {
            findViewById(R.id.m_tool_bar_bottom_line).setVisibility(View.GONE);
        }
        ivCamera = findViewById(R.id.fab_camera);
        if (Setting.isShowCamera && Setting.isBottomRightCamera()) {
            ivCamera.setVisibility(View.VISIBLE);
        }
        if (!Setting.showPuzzleMenu) {
            findViewById(R.id.tv_puzzle).setVisibility(View.GONE);
        }
        mSecondMenus = findViewById(R.id.m_second_level_menu);
        int columns = getResources().getInteger(R.integer.photos_columns_easy_photos);
        tvAlbumItems = findViewById(R.id.tv_album_items);
        tvAlbumItems.setText(albumModel.getAlbumItems().get(0).name);
        tvDone = findViewById(R.id.tv_done);
        rvPhotos = findViewById(R.id.rv_photos);
        ((SimpleItemAnimator) rvPhotos.getItemAnimator()).setSupportsChangeAnimations(false);
        //去除item更新的闪光
        photoList.clear();
        photoList.addAll(albumModel.getCurrAlbumItemPhotos(0));
        int index = 0;
        if (Setting.hasPhotosAd()) {
            photoList.add(index, Setting.photosAdView);
        }
        if (Setting.isShowCamera && !Setting.isBottomRightCamera()) {
            if (Setting.hasPhotosAd()) index = 1;
            photoList.add(index, null);
        }
        photosAdapter = new PhotosAdapter(this, photoList, this);

        gridLayoutManager = new GridLayoutManager(this, columns);
        if (Setting.hasPhotosAd()) {
            gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                @Override
                public int getSpanSize(int position) {
                    if (position == 0) {
                        return gridLayoutManager.getSpanCount();//独占一行
                    } else {
                        return 1;//只占一行中的一列
                    }
                }
            });
        }
        rvPhotos.setLayoutManager(gridLayoutManager);
        rvPhotos.setAdapter(photosAdapter);
        tvOriginal = findViewById(R.id.tv_original);
        if (Setting.showOriginalMenu) {
            processOriginalMenu();
        } else {
            tvOriginal.setVisibility(View.GONE);
        }
        tvPreview = findViewById(R.id.tv_preview);

        initAlbumItems();
        shouldShowMenuDone();
        setClick(R.id.iv_album_items, R.id.tv_clear, R.id.iv_second_menu, R.id.tv_puzzle);
        setClick(tvAlbumItems, rootViewAlbumItems, tvDone, tvOriginal, tvPreview, ivCamera);
    }