detachAndScrapAttachedViews()

[xmusistone]

detachAndScrapAttachedViews()

[xmuSistone]

是把所有的View放到recycler缓存。你可以参考下RecyclerView的源代码：

/**
         * Temporarily detach and scrap all currently attached child views. Views will be scrapped
         * into the given Recycler. The Recycler may prefer to reuse scrap views before
         * other views that were previously recycled.
         *
         * @param recycler Recycler to scrap views into
         */
        public void detachAndScrapAttachedViews(Recycler recycler) {
            final int childCount = getChildCount();
            for (int i = childCount - 1; i >= 0; i--) {
                final View v = getChildAt(i);
                scrapOrRecycleView(recycler, i, v);
            }
        }

        private void scrapOrRecycleView(Recycler recycler, int index, View view) {
            final ViewHolder viewHolder = getChildViewHolderInt(view);
            if (viewHolder.shouldIgnore()) {
                if (DEBUG) {
                    Log.d(TAG, "ignoring view " + viewHolder);
                }
                return;
            }
            if (viewHolder.isInvalid() && !viewHolder.isRemoved() &&
                    !mRecyclerView.mAdapter.hasStableIds()) {
                removeViewAt(index);
                recycler.recycleViewHolderInternal(viewHolder);
            } else {
                detachViewAt(index);
                recycler.scrapView(view);
                mRecyclerView.mViewInfoStore.onViewDetached(viewHolder);
            }
        }

一次for循环下来，确实是把所有的View都放到缓存