Java Code Examples for android.support.v7.widget.RecyclerView#Adapter

/**
 * 取消全部选中
 */
public void unCheckAll(RecyclerView.Adapter adapter) {
    if (mMap.size() == 0) {
        return;
    }
    mMap.clear();
    adapter.notifyDataSetChanged();
}
 

private boolean isFirstItemVisible() {
    if (mRootView != null) {
        final RecyclerView.Adapter adapter = mRootView.getAdapter();
        final GridLayoutManager mLayoutmanager = (GridLayoutManager) mRootView.getLayoutManager();


        if (null == adapter || adapter.getItemCount() == 0) {
            return true;
        } else {
            /**
             * This check should really just be:
             * mRootView.getFirstVisiblePosition() == 0, but PtRListView
             * internally use a HeaderView which messes the positions up. For
             * now we'll just add one to account for it and rely on the inner
             * condition which checks getTop().
             */

            int[] into = {0,0};
            if (mLayoutmanager != null)
                into[0] = mLayoutmanager.findFirstVisibleItemPosition();
            if (into.length > 0 && into.length > 0 && into[0] <= 1) {
                final View firstVisibleChild = mRootView.getChildAt(0);
                if (firstVisibleChild != null) {
                    return firstVisibleChild.getTop() >= mRootView.getTop();
                }
            }
        }
    }

    return false;
}
 

/**
 * 请使用本方法替代RecyclerView.ViewHolder的getLayoutPosition()方法
 *
 * @param recyclerView
 * @param holder
 * @return
 */
public static int getLayoutPosition(RecyclerView recyclerView, RecyclerView.ViewHolder holder) {
    RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();
    if (outerAdapter != null && outerAdapter instanceof LuRecyclerViewAdapter) {

        int headerViewCounter = ((LuRecyclerViewAdapter) outerAdapter).getHeaderViewsCount();
        if (headerViewCounter > 0) {
            return holder.getLayoutPosition() - headerViewCounter;
        }
    }

    return holder.getLayoutPosition();
}
 

/**
 * 设置当前RecyclerView.FooterView的状态
 *
 * @param recyclerView
 * @param state
 */
public static void setFooterViewState(RecyclerView recyclerView, LoadingFooter.State state) {
    RecyclerView.Adapter outerAdapter = recyclerView.getAdapter();
    if (outerAdapter != null && outerAdapter instanceof HeaderAndFooterRecyclerViewAdapter) {
        if (((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterViewsCount() > 0) {
            LoadingFooter footerView = (LoadingFooter) ((HeaderAndFooterRecyclerViewAdapter) outerAdapter).getFooterView();
            footerView.setState(state);
        }
    }
}
 

/** 
 * 判断是否可以上拉 
 * @return 
 */  
private boolean isCanPullUp() {

    if(childView instanceof RecyclerView) {
        final RecyclerView.Adapter adapter = ((RecyclerView) childView).getAdapter();

        if (null == adapter) {
            return true;
        }

        final int lastItemPosition = adapter.getItemCount() - 1;
        final int lastVisiblePosition = ((LinearLayoutManager) ((RecyclerView) childView).getLayoutManager()).findLastVisibleItemPosition();

        if (lastVisiblePosition >= lastItemPosition) {
            final int childIndex = lastVisiblePosition - ((LinearLayoutManager) ((RecyclerView) childView).getLayoutManager()).findFirstVisibleItemPosition();
            final int childCount = ((RecyclerView) childView).getChildCount();
            final int index = Math.min(childIndex, childCount - 1);
            final View lastVisibleChild = ((RecyclerView) childView).getChildAt(index);
            if (lastVisibleChild != null) {

                return lastVisibleChild.getBottom() <= childView.getBottom() - childView.getTop();

            }
        }

        return false;
    }else if(childView instanceof ScrollView){
        return  ((ScrollView) childView).getChildAt(0).getHeight() <= getHeight() + getScrollY();
    }
    return false ;
}
 

public RecyclerSwipeHelper(SwipeRefreshLayout swipe, RecyclerView recycler) {
    this.mSwipe = swipe;
    this.mRecycler = recycler;

    // 刷新监听
    if (mSwipe != null) {
        mSwipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                mHandler.sendEmptyMessage(WHAT_ON_REFRESH);
            }
        });
    }

    // 滑动监听
    mRecycler.addOnScrollListener(WrapperScrollListener);

    // 包装数据源
    mAdapterWrapper = new RecyclerFooterAdapterWrapper(recycler) {
        @Override
        public void setAdapter(RecyclerView.Adapter adapter) {
            if (getRealAdapter() != null) {
                unregisterAdapterDataObserver(mDataObserver);
            }
            super.setAdapter(adapter);
            if (getRealAdapter() != null) {
                registerAdapterDataObserver(mDataObserver);
            }
        }
    };
    mAdapterWrapper.registerAdapterDataObserver(mDataObserver);

    // For GridLayoutManager use separate/customisable span lookup for loading row
    if (mRecycler.getLayoutManager() instanceof GridLayoutManager) {
        mSpanSizeLookup = new SpanSizeLookupWrapper((GridLayoutManager) mRecycler.getLayoutManager(), mAdapterWrapper);
        ((GridLayoutManager) mRecycler.getLayoutManager()).setSpanSizeLookup(mSpanSizeLookup);
    }
}
 

/**
 * 取消全部选中(指定数据)
 *
 * @param adapter
 * @param list    需要取消选择的列表,该列表中如果有选中的item将会置为非选中
 */
@SuppressWarnings("unchecked")
public <T> void unCheckAll(RecyclerView.Adapter adapter, Class<T> clazz, List<T> list) {
    Set<T> set = (Set<T>) mMap.get(clazz);
    if (set == null) {
        return;
    }
    set.removeAll(list);
    if (set.isEmpty()) {
        mMap.remove(clazz);
    }
    adapter.notifyDataSetChanged();
}
 

@Override
protected RecyclerView.Adapter getAdapter() {
    return new CloudUploadingAdapter(getContext(), mData, this);
}
 

public void setAdapter(RecyclerView.Adapter<RecyclerView.ViewHolder> adapter) {
    mAdapter = adapter;
    mAdapter.registerAdapterDataObserver(new AdapterWrapperObserver(this, getAdapterCalculator(), adFetcher));
    notifyDataSetChanged();
}
 

@Override
public RecyclerView.Adapter<? extends RecyclerView.ViewHolder> createAdapter(List<ChipsEntity> chipsEntities, OnRemoveListener onRemoveListener) {
    return new ChipsAdapter(chipsEntities, onRemoveListener);
}
 

public EmptyWrapper(RecyclerView.Adapter adapter) {
    mInnerAdapter = adapter;
}
 

protected void setListAdapter(RecyclerView.Adapter listAdapter) {
    mCurrentListView.setAdapter(listAdapter);
    mCurrentListView.invalidate();
}
 

@Override
public RecyclerView.Adapter<? extends RecyclerView.ViewHolder> createAdapter(List<ChipsEntity> chipsEntities, OnRemoveListener onRemoveListener) {
    return new ChipsAdapter(chipsEntities, onRemoveListener);
}
 

public static void scrollToTopAfterDelay(RecyclerView mRecyclerView, RecyclerView.Adapter mRecyclerAdapter) {
    scrollToPositionAfterDelay(0, mRecyclerView, mRecyclerAdapter);
}
 

WrapperAdapter(RecyclerView.Adapter userAdapter, LoadingItem loadingItem, ErrorItem errorItem) {
    this.userAdapter = userAdapter;
    this.loadingItem = loadingItem;
    this.errorItem = errorItem;
}
 

/**
 * Get the current adapter
 *
 * @return the current adapter
 */
public RecyclerView.Adapter getAdapter() {
    return mAdapter;
}
 

/**
 * If you need to wrap the adpter, this is the interface you are looking for
 *
 * @param adapter
 * @return
 */
protected RecyclerView.Adapter wrapperAdapter(RecyclerView.Adapter adapter) {
    return adapter;
}
 

RecyclerView.Adapter<? extends RecyclerView.ViewHolder> createAdapter(List<Item> chipsEntities, OnRemoveListener onRemoveListener); 

List<RecyclerView.Adapter> getBaseAdapters(); 

void swapAdapter(RecyclerView.Adapter adapter, boolean removeAndRecycleExistingViews);