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

/**
 * 垂直滑动
 *
 * @param recyclerView RecyclerView
 * @param dy           int
 */
private void onVerticalScroll(final RecyclerView recyclerView, int dy) {
    mConsumeY += dy;

    // 让RecyclerView测绘完成后再调用，避免GalleryAdapterHelper.mItemHeight的值拿不到
    recyclerView.post(new Runnable() {
        @Override
        public void run() {
            int shouldConsumeY = mGalleryRecyclerView.getDecoration().mItemConsumeY;

            // 位置浮点值（即总消耗距离 / 每一页理论消耗距离 = 一个浮点型的位置值）
            float offset = (float) mConsumeY / (float) shouldConsumeY;
            // 获取当前页移动的百分值
            float percent = offset - ((int) offset);

            mPosition = (int) offset;

            DLog.i(TAG, "ScrollManager offset=" + offset + "; mConsumeY=" + mConsumeY + "; shouldConsumeY=" + mPosition);


            // 设置动画变化
            mGalleryRecyclerView.getAnimManager().setAnimation(recyclerView, mPosition, percent);
        }
    });
}
 

/**
 * 水平滑动
 *
 * @param recyclerView RecyclerView
 * @param dx           int
 */
private void onHorizontalScroll(final RecyclerView recyclerView, final int dx) {
    mConsumeX += dx;

    // 让RecyclerView测绘完成后再调用，避免GalleryAdapterHelper.mItemWidth的值拿不到
    recyclerView.post(new Runnable() {
        @Override
        public void run() {
            int shouldConsumeX = mGalleryRecyclerView.getDecoration().mItemConsumeX;

            // 位置浮点值（即总消耗距离 / 每一页理论消耗距离 = 一个浮点型的位置值）
            float offset = (float) mConsumeX / (float) shouldConsumeX;

            // 获取当前页移动的百分值
            float percent = offset - ((int) offset);

            mPosition = (int) offset;

            DLog.i(TAG, "ScrollManager offset=" + offset + "; percent=" + percent + "; mConsumeX=" + mConsumeX + "; shouldConsumeX=" + shouldConsumeX + "; position=" + mPosition);

            // 设置动画变化
            mGalleryRecyclerView.getAnimManager().setAnimation(recyclerView, mPosition, percent);
        }
    });

}
 

public static void scrollToBottom(final RecyclerView recyclerView) {
    if (recyclerView != null) {
        if (recyclerView.getAdapter() != null && recyclerView.getAdapter().getItemCount() > 0) {
            recyclerView.post(new Runnable() {
                @Override
                public void run() {
                    recyclerView.smoothScrollToPosition(recyclerView.getAdapter().getItemCount() - 1);
                }
            });
        }
    }
}
 

public void initViews() {
    random = (ImageView) activity.findViewById(R.id.sheet_detail_songs_icon);
    playAllRandom = (TextView) activity.findViewById(R.id.sheet_detail_songs_play_random);
    line = activity.findViewById(R.id.sheet_detail_songs_line);
    songList = (RecyclerView) activity.findViewById(R.id.sheet_detail_songs_list);
    randomContainer = activity.findViewById(R.id.sheet_detail_random_container);

    sortTip = (TextView) activity.findViewById(R.id.sheet_detail_songs_sort_tip);

    checkContainer = activity.findViewById(R.id.sheet_detail_check_container);
    checkAll = (CheckBox) activity.findViewById(R.id.sheet_detail_check_all);
    checkCount = (TextView) activity.findViewById(R.id.sheet_detail_check_count);
    checkAll.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            boolean isChecked = checkAll.isChecked();
            if (isChecked) {
                songAdapter.checkAll();
            } else {
                songAdapter.clearAllCheck();
            }
        }
    });

    randomContainer.setOnClickListener(this);
    FloatingActionButton fabPlayAll = (FloatingActionButton) activity.findViewById(R.id.sheet_detail_play_all);
    fabPlayAll.setOnClickListener(this);

    songList.post(new Runnable() {
        @Override
        public void run() {
            calculateRecycleViewHeight();
        }
    });
}
 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
    setContentView(R.layout.activity_recycler);
    setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
    mRvPostLister = (RecyclerView) findViewById(R.id.rv_post_list);
    final LinearLayoutManager manager = new LinearLayoutManager(this);
    mRvPostLister.setLayoutManager(manager);
    mPostList = new ArrayList<>();
    for (int i = 0; i < 29; i++) {
        List<UserViewInfo> imgUrls = new ArrayList<>();
        UserViewInfo userViewInfo;
        Random ss=new Random();

        for (int j = 0; j <ss.nextInt(9); j++) {
            userViewInfo=new UserViewInfo(     ImageUrlConfig.getUrls().get(j));
            imgUrls.add(userViewInfo);
        }
        Post post = new Post("Am I handsome? Am I handsome? Am I handsome?", imgUrls);
        mPostList.add(post);
    }

    mNineImageAdapter = new PostAdapter(this, mPostList, NineGridImageView.STYLE_GRID);
    mRvPostLister.setAdapter(mNineImageAdapter);
    manager.scrollToPositionWithOffset(5, 0);
    mRvPostLister.post(new Runnable() {
        @Override
        public void run() {
            View view = manager.findViewByPosition(1);
            if (view != null) System.out.println(view.getMeasuredHeight());
        }
    });
}
 

/**
 * {@inheritDoc}
 */
@Override
public void refresh(final boolean layoutUpdated) {
    final RecyclerView contentView = getContentView();

    if (contentView == null) {
        return;
    }

    if (contentView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {
        // contentView.stopScroll();
    }

    updateRunnable = new Runnable() {
        @Override
        public void run() {
            if (!contentView.isComputingLayout()) {
                //to prevent notify update when recyclerView is in computingLayout  process
                mGroupBasicAdapter.notifyUpdate(layoutUpdated);

                if (mSwipeItemTouchListener != null) {
                    mSwipeItemTouchListener.updateCurrCard();
                }
            }
        }
    };
    contentView.post(updateRunnable);
}
 

/**
 * {@inheritDoc}
 */
@Override
public void refresh(final boolean layoutUpdated) {
    final RecyclerView contentView = getContentView();

    if (contentView == null) {
        return;
    }

    if (contentView.getScrollState() != RecyclerView.SCROLL_STATE_IDLE) {
        // contentView.stopScroll();
    }

    updateRunnable = new Runnable() {
        @Override
        public void run() {
            if (!contentView.isComputingLayout()) {
                //to prevent notify update when recyclerView is in computingLayout  process
                mGroupBasicAdapter.notifyUpdate(layoutUpdated);

                if (mSwipeItemTouchListener != null) {
                    mSwipeItemTouchListener.updateCurrCard();
                }
            }
        }
    };
    contentView.post(updateRunnable);
}
 

@Override
public void getItemOffsets(Rect outRect, final View view, final RecyclerView parent, RecyclerView.State state) {
    super.getItemOffsets(outRect, view, parent, state);

    DLog.d(TAG, "GalleryItemDecoration getItemOffset() --> position = " + parent.getChildAdapterPosition(view));

    final int position = parent.getChildAdapterPosition(view);
    final int itemCount = parent.getAdapter().getItemCount();

    parent.post(new Runnable() {
        @Override
        public void run() {
            if (((GalleryRecyclerView) parent).getOrientation() == LinearLayoutManager.HORIZONTAL) {
                onSetHorizontalParams(parent, view, position, itemCount);
            } else {
                onSetVerticalParams(parent, view, position, itemCount);
            }
        }
    });

    view.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (onItemClickListener != null) {
                onItemClickListener.onItemClick(v, position);
            }
        }
    });
}
 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
    setContentView(R.layout.activity_recycler);
    setSupportActionBar((Toolbar) findViewById(R.id.toolbar));

    mRvPostLister = (RecyclerView) findViewById(R.id.rv_post_list);
    final LinearLayoutManager manager = new LinearLayoutManager(this);
    mRvPostLister.setLayoutManager(manager);

    mPostList = new ArrayList<>();
    for (int i = 0; i < 18; i++) {
        List<String> imgUrls = new ArrayList<>();
        imgUrls.addAll(Arrays.asList(IMG_URL_LIST).subList(0, i % 9));
        Post post = new Post("Am I handsome? Am I handsome? Am I handsome?", imgUrls);
        mPostList.add(post);
    }

    mNineImageAdapter = new PostAdapter(this, mPostList, NineGridImageView.STYLE_GRID);
    mRvPostLister.setAdapter(mNineImageAdapter);

    manager.scrollToPositionWithOffset(5, 0);
    mRvPostLister.post(new Runnable() {
        @Override
        public void run() {
            View view = manager.findViewByPosition(1);
            if (view != null) System.out.println(view.getMeasuredHeight());
        }
    });
}
 

public static void scrollToBottom(final RecyclerView recyclerView) {
    if (recyclerView != null) {
        if (recyclerView.getAdapter() != null && recyclerView.getAdapter().getItemCount() > 0) {
            recyclerView.post(new Runnable() {
                @Override
                public void run() {
                    recyclerView.smoothScrollToPosition(recyclerView.getAdapter().getItemCount() - 1);
                }
            });
        }
    }
}
 

@Override
public void getItemOffsets(Rect outRect, View view, final RecyclerView parent, RecyclerView.State state) {
    RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
    final int sumCount = state.getItemCount();
    final int position = params.getViewLayoutPosition();
    final int spanSize;
    final int index;

    if (params instanceof GridLayoutManager.LayoutParams) {
        GridLayoutManager.LayoutParams gridParams = (GridLayoutManager.LayoutParams) params;
        spanSize = gridParams.getSpanSize();
        index = gridParams.getSpanIndex();

        if ((position == 0 || mOldItemCount != sumCount) && mSpanCount > 1) {
            int countInLine = 0;
            int spanIndex;

            for (int tempPosition = sumCount - mSpanCount; tempPosition < sumCount; tempPosition++) {
                spanIndex = ((GridLayoutManager) parent.getLayoutManager()).getSpanSizeLookup().getSpanIndex(tempPosition, mSpanCount);
                countInLine = spanIndex == 0 ? 1 : countInLine + 1;
            }
            mItemCountInLastLine = countInLine;
            if (mOldItemCount != sumCount) {
                mOldItemCount = sumCount;
                if (position != 0) {
                    parent.post(new Runnable() {
                        @Override
                        public void run() {
                            parent.invalidateItemDecorations();
                        }
                    });
                }
            }
        }
    } else if (params instanceof StaggeredGridLayoutManager.LayoutParams) {
        spanSize = ((StaggeredGridLayoutManager.LayoutParams) params).isFullSpan() ? mSpanCount : 1;
        index = ((StaggeredGridLayoutManager.LayoutParams) params).getSpanIndex();
    } else {
        spanSize = 1;
        index = 0;
    }

    if (spanSize < 1 || index < 0 || spanSize > mSpanCount) {
        return;
    }

    outRect.left = mSpace - mRadixX * index;
    outRect.right = mRadixX + mRadixX * (index + spanSize - 1);

    if (mSpanCount == 1 && position == sumCount - 1) {
        outRect.bottom = mSpace;
    } else if (position >= sumCount - mItemCountInLastLine && position < sumCount) {
        outRect.bottom = mSpace;
    }
    outRect.top = mSpace;
}
 

@SuppressLint("InflateParams")
public View createView(int titleTextColor, int backgroundDrawable, int backgroundColor,
                       int dividerBackground, int itemTextColor, int itemBackground,
                       int tintColor, BottomSheetItemClickListener itemClickListener) {

    if (mFromMenu) {
        mItems = createAdapterItems(dividerBackground, titleTextColor,
                itemTextColor, itemBackground, tintColor);
    }

    LayoutInflater layoutInflater = LayoutInflater.from(mContext);

    View sheet = mMode == BottomSheetBuilder.MODE_GRID ?
            layoutInflater.inflate(R.layout.bottomsheetbuilder_sheet_grid, null)
            : layoutInflater.inflate(R.layout.bottomsheetbuilder_sheet_list, null);

    final RecyclerView recyclerView = (RecyclerView) sheet.findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);

    if (backgroundDrawable != 0) {
        sheet.setBackgroundResource(backgroundDrawable);
    } else {
        if (backgroundColor != 0) {
            sheet.setBackgroundColor(backgroundColor);
        }
    }

    // If we only have one title and it's the first item, set it as fixed
    if (mTitles == 1 && mMode == BottomSheetBuilder.MODE_LIST) {
        BottomSheetItem header = mItems.get(0);
        TextView headerTextView = (TextView) sheet.findViewById(R.id.textView);
        if (header instanceof BottomSheetHeader) {
            headerTextView.setVisibility(View.VISIBLE);
            headerTextView.setText(header.getTitle());
            if (titleTextColor != 0) {
                headerTextView.setTextColor(titleTextColor);
            }
            mItems.remove(0);
        }
    }

    final BottomSheetItemAdapter adapter = new BottomSheetItemAdapter(mItems, mMode,
            itemClickListener);

    if (mMode == BottomSheetBuilder.MODE_LIST) {
        recyclerView.setLayoutManager(new LinearLayoutManager(mContext));
        recyclerView.setAdapter(adapter);
    } else {
        final int columns = mContext.getResources().getInteger(R.integer.bottomsheet_grid_columns);
        GridLayoutManager layoutManager = new GridLayoutManager(mContext, columns);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.post(new Runnable() {
            @Override
            public void run() {
                float margin = mContext.getResources()
                        .getDimensionPixelSize(R.dimen.bottomsheet_grid_horizontal_margin);
                adapter.setItemWidth((int) ((recyclerView.getWidth() - 2 * margin) / columns));
                recyclerView.setAdapter(adapter);
            }
        });
    }

    return sheet;
}