androidx.recyclerview.widget.PagerSnapHelper Java Exaples

Source File: PagerSnapActivity.java From DevUtils with Apache License 2.0

6 votes

@Override
    public void initValues() {
        super.initValues();


        List<ItemBean> lists = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            lists.add(ItemBean.newItemBeanPager());
        }

        // 初始化布局管理器、适配器
        pagerSnapAdapter = new PagerSnapAdapter(lists);
        vid_bvr_recy.setLayoutManager(new LinearLayoutManager(this, RecyclerView.HORIZONTAL, false));
//        vid_bvr_recy.setLayoutManager(new LinearLayoutManager(this, RecyclerView.VERTICAL, false));
        vid_bvr_recy.setAdapter(pagerSnapAdapter);

        PagerSnapHelper helper = new PagerSnapHelper();
        helper.attachToRecyclerView(vid_bvr_recy);
    }

Source File: PagerSnapMAXActivity.java From DevUtils with Apache License 2.0

6 votes

@Override
    public void initValues() {
        super.initValues();


        List<ItemBean> lists = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            lists.add(ItemBean.newItemBeanPager());
        }

        // 初始化布局管理器、适配器
        pagerSnapAdapter = new PagerSnapMAXAdapter(this, lists);
        vid_bvr_recy.setLayoutManager(new LinearLayoutManager(this, RecyclerView.HORIZONTAL, false));
//        vid_bvr_recy.setLayoutManager(new LinearLayoutManager(this, RecyclerView.VERTICAL, false));
        vid_bvr_recy.setAdapter(pagerSnapAdapter);

        PagerSnapHelper helper = new PagerSnapHelper();
        helper.attachToRecyclerView(vid_bvr_recy);


        int size = lists.size();
        // 滑动到中间 ( 无滑动过程 )
        ((LinearLayoutManager) vid_bvr_recy.getLayoutManager()).scrollToPositionWithOffset(size * 100 - 1, 10);
        // 复位到中间
        ListViewUtils.smoothScrollToPosition(vid_bvr_recy, size * 100 + 1);
    }

Source File: SnapUtil.java From litho with Apache License 2.0

6 votes

@Nullable
public static SnapHelper getSnapHelper(
    @SnapMode int snapMode, int deltaJumpThreshold, int startSnapFlingOffset) {
  switch (snapMode) {
    case SNAP_TO_CENTER:
      return new PagerSnapHelper();
    case SNAP_TO_START:
      return new StartSnapHelper(startSnapFlingOffset);
    case SNAP_TO_CENTER_CHILD:
      return new LinearSnapHelper();
    case SNAP_TO_CENTER_CHILD_WITH_CUSTOM_SPEED:
      return new CustomSpeedLinearSnapHelper(deltaJumpThreshold);
    case SNAP_TO_END:
    case SNAP_NONE:
    default:
      return null;
  }
}

Source File: SampleActivity.java From EasyPhotos with Apache License 2.0

5 votes

private void initView() {
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.openDrawer(GravityCompat.START);
    drawer.clearAnimation();
    drawer.setAnimation(null);
    drawer.setLayoutAnimation(null);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.addDrawerListener(toggle);
    toggle.syncState();
    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
    navigationView.clearAnimation();
    navigationView.setAnimation(null);
    navigationView.setLayoutAnimation(null);

    bitmapView = findViewById(R.id.iv_image);
    bitmapView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            bitmapView.setVisibility(View.GONE);
        }
    });

    rvImage = (RecyclerView) findViewById(R.id.rv_image);
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
    adapter = new MainAdapter(this, selectedPhotoList);
    rvImage.setLayoutManager(linearLayoutManager);
    rvImage.setAdapter(adapter);
    SnapHelper snapHelper = new PagerSnapHelper();
    snapHelper.attachToRecyclerView(rvImage);
}

Source File: NotePreviewActivity.java From CrazyDaily with Apache License 2.0

5 votes

@Override
protected void initView() {
    mDelete.setColorFilter(Color.WHITE);
    mPagerSnapHelper = new PagerSnapHelper();
    mImageList.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
    // 重置
    mImageList.setOnFlingListener(null);
    mPagerSnapHelper.attachToRecyclerView(mImageList);
    mImageList.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
            scrollImage(getCurrentPosition(recyclerView));
        }
    });
}

Source File: RecyclerViewFragment.java From CircleIndicator with Apache License 2.0

5 votes

@Override public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    mAdapter = new SampleRecyclerAdapter(5);

    RecyclerView recyclerView = view.findViewById(R.id.recycler_view);

    LinearLayoutManager layoutManager =
            new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setAdapter(mAdapter);

    PagerSnapHelper pagerSnapHelper = new PagerSnapHelper();
    pagerSnapHelper.attachToRecyclerView(recyclerView);

    // CircleIndicator2 for RecyclerView
    CircleIndicator2 indicator = view.findViewById(R.id.indicator);
    indicator.attachToRecyclerView(recyclerView, pagerSnapHelper);

    // Scroll To Position
    layoutManager.scrollToPosition(2);

    // Observe Data Change
    mAdapter.registerAdapterDataObserver(indicator.getAdapterDataObserver());
    view.findViewById(R.id.add).setOnClickListener(new View.OnClickListener() {
        @Override public void onClick(View v) {
            mAdapter.add();
        }
    });
    view.findViewById(R.id.remove).setOnClickListener(v -> {
        mAdapter.remove();
    });
}

Source File: PreviewActivity.java From EasyPhotos with Apache License 2.0

4 votes

private void initRecyclerView() {
    rvPhotos = findViewById(R.id.rv_photos);
    adapter = new PreviewPhotosAdapter(this, photos, this);
    lm = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
    rvPhotos.setLayoutManager(lm);
    rvPhotos.setAdapter(adapter);
    rvPhotos.scrollToPosition(index);
    toggleSelector();
    snapHelper = new PagerSnapHelper();
    snapHelper.attachToRecyclerView(rvPhotos);
    rvPhotos.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);

            View view = snapHelper.findSnapView(lm);
            if (view == null) {
                return;
            }
            int position = lm.getPosition(view);
            if (lastPosition == position) {
                return;
            }
            lastPosition = position;
            previewFragment.setSelectedPosition(-1);
            tvNumber.setText(getString(R.string.preview_current_number_easy_photos, lastPosition + 1, photos.size()));
            toggleSelector();
            PreviewPhotosAdapter.PreviewPhotosViewHolder holder = (PreviewPhotosAdapter.PreviewPhotosViewHolder) rvPhotos.getChildViewHolder(view);
            if (holder == null) {
                return;
            }
            if (holder.ivPhoto != null && holder.ivPhoto.getScale() != 1f) {
                holder.ivPhoto.setScale(1f, true);
            }
            if (holder.ivBigPhoto != null && holder.ivBigPhoto.getScale() != 1f) {
                holder.ivBigPhoto.resetScaleAndCenter();
            }
        }
    });
    tvNumber.setText(getString(R.string.preview_current_number_easy_photos, index + 1,
            photos.size()));
}

Source File: PagerLayoutManager.java From videoplay with Apache License 2.0

4 votes

PagerLayoutManager(Context context) {
    super(context);
    mPagerSnapHelper = new PagerSnapHelper();
}

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

4 votes

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    int screenWidth = getScreenWidth();

    // Setup ViewPager with indicator
    ViewPager pager = findViewById(R.id.pager);
    DemoPagerAdapter pagerAdapter = new DemoPagerAdapter(8);
    pager.setAdapter(pagerAdapter);

    ScrollingPagerIndicator pagerIndicator = findViewById(R.id.pager_indicator);
    pagerIndicator.attachToPager(pager);

    // Setup ViewPager2 with indicator
    ViewPager2 pager2 = findViewById(R.id.pager2);
    DemoRecyclerViewAdapter pagerAdapter2 = new DemoRecyclerViewAdapter(8, ViewGroup.LayoutParams.MATCH_PARENT);
    pager2.setAdapter(pagerAdapter2);

    ScrollingPagerIndicator pagerIndicator2 = findViewById(R.id.pager_indicator2);
    pagerIndicator2.attachToPager(pager2);

    // Setup RecyclerView with indicator
    // One page will occupy 1/3 of screen width
    RecyclerView recyclerView = findViewById(R.id.recycler);
    recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
    DemoRecyclerViewAdapter recyclerAdapter = new DemoRecyclerViewAdapter(8, screenWidth / 3);
    recyclerView.setAdapter(recyclerAdapter);

    recyclerView.setPadding(screenWidth / 3, 0, screenWidth / 3, 0);

    ScrollingPagerIndicator recyclerIndicator = findViewById(R.id.recycler_indicator);
    // Consider page in the middle current
    recyclerIndicator.attachToRecyclerView(recyclerView);

    SnapHelper snapHelper = new PagerSnapHelper();
    snapHelper.attachToRecyclerView(recyclerView);

    // Some controls
    NumberPicker pageCountPicker = findViewById(R.id.page_number_picker);
    pageCountPicker.setMaxValue(99);
    pageCountPicker.setMinValue(0);
    pageCountPicker.setValue(pagerAdapter.getCount());

    NumberPicker visibleDotCountPicker = findViewById(R.id.visible_dot_number_picker);
    visibleDotCountPicker.setMinValue(3);
    visibleDotCountPicker.setMaxValue(11);
    visibleDotCountPicker.setValue(pagerIndicator.getVisibleDotCount());

    visibleDotCountPicker.setOnValueChangedListener((picker, oldVal, newVal) -> {
        if (newVal % 2 == 0) {
            Toast.makeText(this, "Visible dot count must be odd number", Toast.LENGTH_SHORT).show();
            return;
        }
        pagerIndicator.setVisibleDotCount(newVal);
        recyclerIndicator.setVisibleDotCount(newVal);
    });

    pageCountPicker.setOnValueChangedListener((picker, oldVal, newVal) -> {
        if (pager.getCurrentItem() >= newVal - 1) {
            pager.setCurrentItem(newVal - 1, false);
        }
        pagerAdapter.setCount(newVal);
        recyclerAdapter.setCount(newVal);
    });
}

Source File: ScrollCompat.java From SmoothRefreshLayout with MIT License

4 votes

public static boolean scrollCompat(View view, float deltaY) {
    if (view != null) {
        if (view instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) view;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                absListView.scrollListBy((int) deltaY);
            } else if (absListView instanceof ListView) {
                // {@link android.support.v4.widget.ListViewCompat#scrollListBy(ListView,
                // int)}
                final ListView listView = (ListView) absListView;
                final int firstPosition = listView.getFirstVisiblePosition();
                if (firstPosition == ListView.INVALID_POSITION) {
                    return false;
                }
                final View firstView = listView.getChildAt(0);
                if (firstView == null) {
                    return false;
                }
                final int newTop = (int) (firstView.getTop() - deltaY);
                listView.setSelectionFromTop(firstPosition, newTop);
            } else {
                absListView.smoothScrollBy((int) deltaY, 0);
            }
            return true;
        } else if (view instanceof WebView
                || view instanceof ScrollView
                || view instanceof NestedScrollView) {
            view.scrollBy(0, (int) deltaY);
            return true;
        } else if (ViewCatcherUtil.isRecyclerView(view)) {
            RecyclerView recyclerView = (RecyclerView) view;
            if (!(recyclerView.getOnFlingListener() instanceof PagerSnapHelper)) {
                // Fix the problem of adding new data to RecyclerView while in Fling state,
                // the new items will continue to Fling
                if (recyclerView.getScrollState() == RecyclerView.SCROLL_STATE_SETTLING) {
                    recyclerView.stopScroll();
                }
                view.scrollBy(0, (int) deltaY);
            }
            return true;
        }
    }
    return false;
}

Source File: NoteAdapter.java From CrazyDaily with Apache License 2.0

4 votes

@Override
protected void convert(@NonNull BaseViewHolder holder, @NonNull NoteEntity item) {
    TextView date = holder.getTextView(R.id.item_note_date);
    ImageView menu = holder.getImageView(R.id.item_note_menu);

    TextView content = holder.getTextView(R.id.item_note_content);
    date.setText(DateUtil.formatDate(item.getId(), DateUtil.PATTERN_ONE));
    menu.setColorFilter(Color.parseColor("#333333"));
    content.setText(item.getText());
    String videoUrl = item.getVideoUrl();
    ViewGroup typeVideo = holder.getView(R.id.item_note_type_video);
    ViewGroup typeImage = holder.getView(R.id.item_note_type_image);
    if (videoUrl == null) {
        typeVideo.setVisibility(View.GONE);
        typeImage.setVisibility(View.VISIBLE);
        RecyclerView images = holder.getView(R.id.item_note_images, RecyclerView.class);
        TextView indicator = holder.getTextView(R.id.item_note_images_indicator);
        GradientDrawable drawable = new GradientDrawable();
        drawable.setCornerRadius(ScreenUtil.dp2px(mContext, 15));
        drawable.setColor(Color.parseColor("#7FB2B2B2"));
        indicator.setBackground(drawable);
        // 图片显示
        PagerSnapHelper pagerSnapHelper = new PagerSnapHelper();
        images.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
        images.setAdapter(new ImageAdapter(item.getImages()));
        // 重置
        images.setOnFlingListener(null);
        pagerSnapHelper.attachToRecyclerView(images);
        images.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
                //noinspection ConstantConditions
                final int i = layoutManager.getPosition(pagerSnapHelper.findSnapView(layoutManager));
                scrollImage(i, holder);
            }
        });
        scrollImage(0, holder);
    } else {
        typeVideo.setVisibility(View.VISIBLE);
        typeImage.setVisibility(View.GONE);
        ImageView thumbnail = holder.getView(R.id.item_note_video_thumbnail);
        ImageLoader.load(mContext, videoUrl, thumbnail);
        thumbnail.setOnClickListener(v -> {
            ViewGroup parent = (ViewGroup) mVideoPlayer.getParent();
            if (parent != null) {
                parent.removeView(mVideoPlayer);
                resetRecycler();
            }
            NeihanVideoPlayerController controller = new NeihanVideoPlayerController(mContext);
            controller.setTitle("");
            mVideoPlayer.setUp(videoUrl, null);
            mVideoPlayer.setController(controller);
            mVideoPlayer.start();
            typeVideo.addView(mVideoPlayer);
        });
    }
    menu.setOnClickListener(v -> {
        if (mOnMenuClickListener != null) {
            mOnMenuClickListener.onClick(mData.get(holder.getLayoutPosition()));
        }
    });
}

androidx.recyclerview.widget.PagerSnapHelper Java Examples