android.support.v7.widget.RecyclerView#scrollToPosition

Source File: Utils.java From smooth-app-bar-layout with Apache License 2.0

6 votes

public static boolean syncOffset(SmoothAppBarLayout smoothAppBarLayout, View target, int verticalOffset, View scroll) {
  boolean isSelected = target == scroll;
  if (scroll instanceof NestedScrollView) {
    NestedScrollView nestedScrollView = (NestedScrollView) scroll;
    if (nestedScrollView.getScrollY() < verticalOffset || (!isSelected && isScrollToTop(target))) {
      nestedScrollView.scrollTo(0, verticalOffset);
    }
    if (isSelected && (nestedScrollView.getScrollY() < verticalOffset || verticalOffset == 0)) {
      nestedScrollView.scrollTo(0, 0);
      smoothAppBarLayout.syncOffset(0);
    }
  } else if (scroll instanceof RecyclerView) {
    RecyclerView recyclerView = (RecyclerView) scroll;
    boolean isAccuracy = recyclerView.getLayoutManager().findViewByPosition(ObservableRecyclerView.HEADER_VIEW_POSITION) != null;
    if (isAccuracy && recyclerView.computeVerticalScrollOffset() < verticalOffset) {
      recyclerView.scrollBy(0, verticalOffset - recyclerView.computeVerticalScrollOffset());
    } else if (!isSelected && isScrollToTop(target)) {
      recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
    }
    if (isAccuracy && isSelected && (recyclerView.computeVerticalScrollOffset() < verticalOffset || verticalOffset == 0)) {
      recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
      smoothAppBarLayout.syncOffset(0);
    }
  }
  return true;
}

Source File: Utils.java From Expert-Android-Programming with MIT License

6 votes

public static boolean syncOffset(SmoothAppBarLayout smoothAppBarLayout, View target, int verticalOffset, View scroll) {
  boolean isSelected = target == scroll;
  if (scroll instanceof NestedScrollView) {
    NestedScrollView nestedScrollView = (NestedScrollView) scroll;
    if (nestedScrollView.getScrollY() < verticalOffset || (!isSelected && isScrollToTop(target))) {
      nestedScrollView.scrollTo(0, verticalOffset);
    }
    if (isSelected && (nestedScrollView.getScrollY() < verticalOffset || verticalOffset == 0)) {
      nestedScrollView.scrollTo(0, 0);
      smoothAppBarLayout.syncOffset(0);
    }
  } else if (scroll instanceof RecyclerView) {
    RecyclerView recyclerView = (RecyclerView) scroll;
    boolean isAccuracy = recyclerView.getLayoutManager().findViewByPosition(ObservableRecyclerView.HEADER_VIEW_POSITION) != null;
    if (isAccuracy && recyclerView.computeVerticalScrollOffset() < verticalOffset) {
      recyclerView.scrollBy(0, verticalOffset - recyclerView.computeVerticalScrollOffset());
    } else if (!isSelected && isScrollToTop(target)) {
      recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
    }
    if (isAccuracy && isSelected && (recyclerView.computeVerticalScrollOffset() < verticalOffset || verticalOffset == 0)) {
      recyclerView.scrollToPosition(ObservableRecyclerView.HEADER_VIEW_POSITION);
      smoothAppBarLayout.syncOffset(0);
    }
  }
  return true;
}

Source File: ItemTouchHelper.java From letv with Apache License 2.0

6 votes

public void onMoved(RecyclerView recyclerView, ViewHolder viewHolder, int fromPos, ViewHolder target, int toPos, int x, int y) {
    LayoutManager layoutManager = recyclerView.getLayoutManager();
    if (layoutManager instanceof ViewDropHandler) {
        ((ViewDropHandler) layoutManager).prepareForDrop(viewHolder.itemView, target.itemView, x, y);
        return;
    }
    if (layoutManager.canScrollHorizontally()) {
        if (layoutManager.getDecoratedLeft(target.itemView) <= recyclerView.getPaddingLeft()) {
            recyclerView.scrollToPosition(toPos);
        }
        if (layoutManager.getDecoratedRight(target.itemView) >= recyclerView.getWidth() - recyclerView.getPaddingRight()) {
            recyclerView.scrollToPosition(toPos);
        }
    }
    if (layoutManager.canScrollVertically()) {
        if (layoutManager.getDecoratedTop(target.itemView) <= recyclerView.getPaddingTop()) {
            recyclerView.scrollToPosition(toPos);
        }
        if (layoutManager.getDecoratedBottom(target.itemView) >= recyclerView.getHeight() - recyclerView.getPaddingBottom()) {
            recyclerView.scrollToPosition(toPos);
        }
    }
}

Source File: ItemDragHelper.java From MultiItem with Apache License 2.0

6 votes

/**
     * 当item位置变换，滚动recycler到正确的位置
     * TODO: 2017/2/21 0021 整理更优雅的写法  还有scrollToPosition(0)是否必要？
     */
    private void scrollToRightPositionWhenItemChanged(RecyclerView recyclerView, View itemView, int itemPos) {
        final RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
        if (layoutManager instanceof ItemTouchHelper.ViewDropHandler) {
            OrientationHelper helper = OrientationHelper.createVerticalHelper(layoutManager);
            int start = helper.getDecoratedStart(itemView);
            int end = helper.getDecoratedEnd(itemView);
            ((LinearLayoutManager) layoutManager).scrollToPositionWithOffset(
                    itemPos, lastItemPos > itemPos ? start : end - itemViewHeight);
//                System.out.println(lastItemPos + "-" + childPos + "OrientationHelperOrientationHelper:"
//                        + height + "==" + itemViewHeight + "=||=" + start + "===" + end + "||||||" + myStart + "===" + itemTargetView.getHeight() );
        }
        if (lastItemPos == 0 || itemPos == 0) {
            recyclerView.scrollToPosition(0);
        }
    }

Source File: LocalMusicFragment.java From YCAudioPlayer with Apache License 2.0

5 votes

public void onRefresh() {
    RecyclerView mRecyclerView = recyclerView.getRecyclerView();
    int firstVisibleItemPosition = ((LinearLayoutManager)
            mRecyclerView.getLayoutManager()).findFirstVisibleItemPosition();
    if (firstVisibleItemPosition == 0) {
        onLazyLoad();
        return;
    }
    mRecyclerView.scrollToPosition(5);
    mRecyclerView.smoothScrollToPosition(0);
}

Source File: TangramEngine.java From Tangram-Android with MIT License

5 votes

/**
 * {@inheritDoc}
 */
@Override
public void scrollToPosition(BaseCell cell) {
    if (cell != null) {
        int pos = mGroupBasicAdapter.getComponents().indexOf(cell);
        if (pos > 0) {
            RecyclerView recyclerView = getContentView();
            if (recyclerView != null) {
                recyclerView.scrollToPosition(pos);
            }
        }
    }
}

Source File: TangramEngine.java From Tangram-Android with MIT License

5 votes

/**
 * {@inheritDoc}
 */
@Override
public void scrollToPosition(Card card) {
    List<BaseCell> cells = card.getCells();
    if (cells.size() > 0) {
        BaseCell cell = cells.get(0);
        int pos = mGroupBasicAdapter.getComponents().indexOf(cell);
        if (pos > 0) {
            RecyclerView recyclerView = getContentView();
            if (recyclerView != null) {
                recyclerView.scrollToPosition(pos);
            }
        }
    }
}

Source File: RecyclerViewAdapter.java From NoListAdapter with Apache License 2.0

5 votes

@Override
public void hideErrorView(RecyclerView recyclerView) {
    if (errorViewBinder == null && !isErrorViewShowing())
        return;
    errorViewBinder.showNow = false;
    notifyDataSetChanged();
    recyclerView.scrollToPosition(0);
}

Source File: TangramEngine.java From Tangram-Android with MIT License

5 votes

/**
 * {@inheritDoc}
 */
@Override
public void scrollToPosition(Card card) {
    List<BaseCell> cells = card.getCells();
    if (cells.size() > 0) {
        BaseCell cell = cells.get(0);
        int pos = mGroupBasicAdapter.getComponents().indexOf(cell);
        if (pos > 0) {
            RecyclerView recyclerView = getContentView();
            if (recyclerView != null) {
                recyclerView.scrollToPosition(pos);
            }
        }
    }
}

Source File: DemoTwoRecyclerViewActivity.java From TvWidget with Apache License 2.0

5 votes

private void createData(RecyclerView recyclerView,int id) {
    //创建数据集
    String[] dataset = new String[100];
    for (int i = 0; i < dataset.length; i++) {
        dataset[i] = "item" + i;
    }
    // 创建Adapter，并指定数据集
    MyAdapter adapter = new MyAdapter(this, dataset,id);
    // 设置Adapter
    recyclerView.setAdapter(adapter);
    recyclerView.scrollToPosition(0);
}

Source File: RecyclerViewAdapter.java From NoListAdapter with Apache License 2.0

5 votes

@Override
public void showErrorView(RecyclerView recyclerView) {
    if (errorViewBinder == null || isErrorViewShowing())
        return;
    errorViewBinder.showNow = true;
    notifyDataSetChanged();
    recyclerView.scrollToPosition(0);
}

Source File: EndlessStaggeredGridLayoutActivity.java From HeaderAndFooterRecyclerView with Apache License 2.0

5 votes

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sample_activity);

    mRecyclerView = (RecyclerView) findViewById(R.id.list);

    //init data
    ArrayList<String> dataList = new ArrayList<>();
    for (int i = 0; i < 20; i++) {
        dataList.add("item" + i);
    }

    mCurrentCounter = dataList.size();

    mDataAdapter = new DataAdapter(this);
    mDataAdapter.addAll(dataList);

    mHeaderAndFooterRecyclerViewAdapter = new HeaderAndFooterRecyclerViewAdapter(mDataAdapter);
    mRecyclerView.setAdapter(mHeaderAndFooterRecyclerViewAdapter);

    //setLayoutManager
    ExStaggeredGridLayoutManager manager = new ExStaggeredGridLayoutManager (2, StaggeredGridLayoutManager.VERTICAL);
    manager.setSpanSizeLookup(new HeaderSpanSizeLookup((HeaderAndFooterRecyclerViewAdapter) mRecyclerView.getAdapter(), manager.getSpanCount()));
    mRecyclerView.setLayoutManager(manager);

    RecyclerViewUtils.setHeaderView(mRecyclerView, new SampleHeader(this));

    RecyclerViewStateUtils.setFooterViewState(EndlessStaggeredGridLayoutActivity.this, mRecyclerView, REQUEST_COUNT, LoadingFooter.State.Normal, null);
    mRecyclerView.addOnScrollListener(mOnScrollListener);
    mRecyclerView.scrollToPosition(0);
}

Source File: PreviewActivity.java From imsdk-android with MIT License

5 votes

private void initRecyclerView() {
    rvPhotos = (RecyclerView) 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 || holder.ivPhoto == null) {
                return;
            }
            if (holder.ivPhoto.getScale() != 1f) {
                holder.ivPhoto.setScale(1f, true);


            }
        }
    });
    tvNumber.setText(getString(R.string.preview_current_number_easy_photos, index + 1, photos.size()));
}

Source File: TestUtils.java From Awesome-WanAndroid with Apache License 2.0

4 votes

public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    recyclerView.scrollToPosition(this.position);
}

Source File: MoonPhasesView1.java From SuntimesWidget with GNU General Public License v3.0

4 votes

private void init(Context context, AttributeSet attrs)
{
    initLocale(context);
    LayoutInflater.from(context).inflate(R.layout.layout_view_moonphases1, this, true);

    if (attrs != null)
    {
        LayoutParams lp = generateLayoutParams(attrs);
        centered = ((lp.gravity == Gravity.CENTER) || (lp.gravity == Gravity.CENTER_HORIZONTAL));
    }

    empty = (TextView)findViewById(R.id.txt_empty);
    card_view = (RecyclerView)findViewById(R.id.moonphases_card);

    card_layout = new LinearLayoutManager(context);
    card_layout.setOrientation(LinearLayoutManager.HORIZONTAL);

    card_view.setHasFixedSize(true);
    card_view.setItemViewCacheSize(7);
    card_view.setLayoutManager(card_layout);

    card_adapter = new PhaseAdapter(context);
    card_adapter.setItemWidth(Resources.getSystem().getDisplayMetrics().widthPixels / 4);  // initial width; reassigned later in onSizeChanged

    card_view.setAdapter(card_adapter);
    card_view.scrollToPosition(PhaseAdapter.CENTER_POSITION);

    GravitySnapHelper snapHelper = new GravitySnapHelper(Gravity.START); // new LinearSnapHelper();
    snapHelper.attachToRecyclerView(card_view);

    //card_scroller = new CardAdapter.CardViewScroller(context);
    //card_view.setOnScrollListener(onCardScrollListener);

    forwardButton = (ImageButton)findViewById(R.id.info_time_nextbtn);
    forwardButton.setOnClickListener(onResetClick1);
    forwardButton.setVisibility(GONE);

    backButton = (ImageButton)findViewById(R.id.info_time_prevbtn);
    backButton.setOnClickListener(onResetClick0);
    backButton.setVisibility(VISIBLE);
    backButton.postDelayed(new Runnable() {
        @Override
        public void run() {
            int position = card_layout.findFirstVisibleItemPosition();
            if (position == PhaseAdapter.CENTER_POSITION) {
                ViewUtils.fadeOutButton(backButton, ViewUtils.ANIM_VERYLONG);
            }
        }
    }, 1200);

    card_view.setOnScrollListener(onScrollChanged);

    initTheme(context);
    if (isInEditMode()) {
        updateViews(context);
    }
}

Source File: FragmentMediaPlayer.java From iGap-Android with GNU Affero General Public License v3.0

4 votes

private void initComponent(final View view) {

        final ImageView img_MusicImage = (ImageView) view.findViewById(R.id.ml_img_music_picture);
        onSetImage = new OnSetImage() {
            @Override
            public void setImage() {
                img_MusicImage.setImageBitmap(MusicPlayer.mediaThumpnail);
            }
        };

        musicSeekbar = view.findViewById(R.id.ml_seekBar1);
        musicSeekbar.setOnTouchListener(new View.OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                if (event.getAction() == MotionEvent.ACTION_UP) {
                    MusicPlayer.setMusicProgress(musicSeekbar.getProgress());
                }
                return false;
            }
        });


        onBackFragment = new OnBackFragment() {
            @Override
            public void onBack() {
                removeFromBaseFragment();
            }
        };

        rcvListMusicPlayer = (RecyclerView) view.findViewById(R.id.rcvListMusicPlayer);
        final SlidingUpPanelLayout slidingUpPanelLayout = (SlidingUpPanelLayout) view.findViewById(R.id.sliding_layout);

        footerAdapter = new ItemAdapter<>();
        fastItemAdapter = new FastItemAdapter();
        fastItemAdapter.addAdapter(1, footerAdapter);

        rcvListMusicPlayer.setAdapter(fastItemAdapter);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(_mActivity);
        rcvListMusicPlayer.setLayoutManager(linearLayoutManager);
        rcvListMusicPlayer.setHasFixedSize(true);

        rcvListMusicPlayer.addOnScrollListener(new EndlessRecyclerOnScrollListener(footerAdapter) {
            @Override
            public void onLoadMore(int currentPage) {
                footerAdapter.clear();
                footerAdapter.add(new ProgressItem().withEnabled(false));
                // Load your items here and add it to FastAdapter

                if (isThereAnyMoreItemToLoad) {
                    getInfoRealm();
                }
            }
        });


//        getDataFromServer(ProtoClientSearchRoomHistory.ClientSearchRoomHistory.Filter.AUDIO);
        loadLocalData(ProtoClientSearchRoomHistory.ClientSearchRoomHistory.Filter.AUDIO, ProtoGlobal.RoomMessageType.AUDIO);
        mediaList = new ArrayList<>();

        for (RealmRoomMessage r : MusicPlayer.mediaList) {
            if (r.isValid()) {
                fastItemAdapter.add(new AdapterListMusicPlayer().setItem(r).withIdentifier(r.getMessageId()));
            }
        }
        rcvListMusicPlayer.scrollToPosition(fastItemAdapter.getPosition(Long.parseLong(MusicPlayer.messageId)));
    }

Source File: FastScrollToTop.java From RecyclerViewTools with Apache License 2.0

4 votes

@Override public void run() {
   RecyclerView recyclerView = weakRecycler.get();
   if (recyclerView == null) return;
   recyclerView.scrollToPosition(lastScroll);
   recyclerView.smoothScrollToPosition(0);
}

Source File: RecyclerViewStateUtils.java From HeaderAndFooterRecyclerView with Apache License 2.0

4 votes

/**
 * 设置headerAndFooterAdapter的FooterView State
 *
 * @param instance      context
 * @param recyclerView  recyclerView
 * @param pageSize      分页展示时，recyclerView每一页的数量
 * @param state         FooterView State
 * @param errorListener FooterView处于Error状态时的点击事件
 */
public static void setFooterViewState(Activity instance, RecyclerView recyclerView, int pageSize, LoadingFooter.State state, View.OnClickListener errorListener) {

    if(instance==null || instance.isFinishing()) {
        return;
    }

    RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();

    if (outerAdapter == null || !(outerAdapter instanceof HeaderAndFooterRecyclerViewAdapter)) {
        return;
    }

    HeaderAndFooterRecyclerViewAdapter headerAndFooterAdapter = (HeaderAndFooterRecyclerViewAdapter) outerAdapter;

    //只有一页的时候，就别加什么FooterView了
    if (headerAndFooterAdapter.getInnerAdapter().getItemCount() < pageSize) {
        return;
    }

    LoadingFooter footerView;

    //已经有footerView了
    if (headerAndFooterAdapter.getFooterViewsCount() > 0) {
        footerView = (LoadingFooter) headerAndFooterAdapter.getFooterView();
        footerView.setState(state);

        if (state == LoadingFooter.State.NetWorkError) {
            footerView.setOnClickListener(errorListener);
        }
        recyclerView.scrollToPosition(headerAndFooterAdapter.getItemCount() - 1);
    } else {
        footerView = new LoadingFooter(instance);
        footerView.setState(state);

        if (state == LoadingFooter.State.NetWorkError) {
            footerView.setOnClickListener(errorListener);
        }

        headerAndFooterAdapter.addFooterView(footerView);
        recyclerView.scrollToPosition(headerAndFooterAdapter.getItemCount() - 1);
    }
}

Source File: TestUtils.java From Scoops with Apache License 2.0

4 votes

public void perform(UiController uiController, View view) {
    RecyclerView recyclerView = (RecyclerView) view;
    recyclerView.scrollToPosition(this.position);
}

Source File: MoonApsisView.java From SuntimesWidget with GNU General Public License v3.0

4 votes

private void init(Context context, AttributeSet attrs)
{
    SuntimesUtils.initDisplayStrings(context);
    LayoutInflater.from(context).inflate(R.layout.layout_view_moonapsis, this, true);
    content = (LinearLayout)findViewById(R.id.moonapsis_layout);

    card_layout = new LinearLayoutManager(context);
    card_layout.setOrientation(LinearLayoutManager.HORIZONTAL);

    card_view = (RecyclerView)findViewById(R.id.moonapsis_card);
    card_view.setHasFixedSize(true);
    card_view.setItemViewCacheSize(7);
    card_view.setLayoutManager(card_layout);

    card_adapter = new MoonApsisAdapter(context);
    card_adapter.setItemWidth(Resources.getSystem().getDisplayMetrics().widthPixels / 3);  // initial width; 3 to screen; reassigned later in onSizeChanged

    card_view.setAdapter(card_adapter);
    card_view.scrollToPosition(MoonApsisAdapter.CENTER_POSITION);

    GravitySnapHelper snapHelper = new GravitySnapHelper(Gravity.START); // new LinearSnapHelper();
    snapHelper.attachToRecyclerView(card_view);

    forwardButton = (ImageButton)findViewById(R.id.info_time_nextbtn);
    forwardButton.setOnClickListener(onResetClick1);
    forwardButton.setVisibility(GONE);

    backButton = (ImageButton)findViewById(R.id.info_time_prevbtn);
    backButton.setOnClickListener(onResetClick0);
    backButton.setVisibility(VISIBLE);
    backButton.postDelayed(new Runnable() {
        @Override
        public void run() {
            int position = card_layout.findFirstVisibleItemPosition();
            if (position == MoonApsisAdapter.CENTER_POSITION) {
                ViewUtils.fadeOutButton(backButton, ViewUtils.ANIM_VERYLONG);
            }
        }
    }, 1200);

    card_view.setOnScrollListener(onScrollChanged);

    initTheme(context);
    if (isInEditMode()) {
        updateViews(context);
    }
}

Java Code Examples for android.support.v7.widget.RecyclerView#scrollToPosition()