1.处理Adapter的更新 2.决定那些动画需要执行 3.保存当前View的信息 4.如果必要的话，执行上一个Layout的操作并且保存他的信息

Method called when an animation on a view should be ended immediately. This could happen when other events, like scrolling, occur, so that animating v

{@inheritDoc}

Return the ViewHolder for the item in the given position of the data set. Unlike {@link #findViewHolderForLayoutPosition(int)} this method takes into

@deprecated use {@link #findViewHolderForLayoutPosition(int)} or {@link #findViewHolderForAdapterPosition(int)}

@return The final offset amount for children

@return The final offset amount for children

Begin a standard fling with an initial velocity along each axis in pixels per second. If the velocity given is below the system-defined minimum this m

Retrieves the previously set adapter or null if no adapter is set. @return The previously set adapter @see #setAdapter(Adapter)

@see RecyclerView#getChildLayoutPosition(android.view.View)

Returns the bottom edge of the given child view within its parent, offset by any applied {@link ItemDecoration ItemDecorations}. @param child Child t

Returns the bounds of the view including its decoration and margins. @param view The view element to check @param outBounds A rect that will receive

Returns the left edge of the given child view within its parent, offset by any applied {@link ItemDecoration ItemDecorations}. @param child Child to

Returns the measured height of the given child, plus the additional size of any insets applied by {@link ItemDecoration ItemDecorations}. @param chil

Returns the measured width of the given child, plus the additional size of any insets applied by {@link ItemDecoration ItemDecorations}. @param child

Returns the right edge of the given child view within its parent, offset by any applied {@link ItemDecoration ItemDecorations}. @param child Child to

Returns the top edge of the given child view within its parent, offset by any applied {@link ItemDecoration ItemDecorations}. @param child Child to q

Returns the end position of the layout without taking padding into account. @return The end boundary for this layout without considering padding.

Returns the padding at the end of the layout. For horizontal helper, this is the right padding and for vertical helper, this is the bottom padding. Th

<p>Returns the amount of extra space that should be laid out by LayoutManager.</p> <p> <p>By default, {@link android.support.v7.widget.LinearLayoutMan

Returns the number of {@link ItemDecoration} currently added to this RecyclerView. @return number of ItemDecorations currently added added to this Re

@return The view type of this ViewHolder.

@return The host RecyclerView's {@link View#getMinimumHeight()}

@return The host RecyclerView's {@link View#getMinimumWidth()}

Returns the adapter position of the item represented by the given View. This does not contain any adapter changes that might have happened after the l

获取十六进制的颜色代码.例如 "#6E36B4" , For HTML , @return String

Returns the end of the View after its matrix transformations are applied to its layout position. <p> This method is useful when trying to detect the v

Returns the start of the View after its matrix transformations are applied to its layout position. <p> This method is useful when trying to detect the

Returns true if the adapter data item corresponding to the view this LayoutParams is attached to has been changed in the data set. A LayoutManager may

Returns true if SmoothScroller has been started but has not received the first animation callback yet. @return True if this SmoothScroller is waiting

@return true if this item is available to be recycled, false otherwise. @see #setIsRecyclable(boolean)

Notify any registered observers that the <code>itemCount</code> items starting at position <code>positionStart</code> have changed. Equivalent to call

Returns a new {@link ItemHolderInfo} which will be used to store information about the ViewHolder. This information will later be passed into <code>an

Offset the bounds of all child views by <code>dx</code> pixels. Useful for implementing simple scrolling in {@link LayoutManager LayoutManagers}. @pa

Offset the bounds of all child views by <code>dy</code> pixels. Useful for implementing simple scrolling in {@link LayoutManager LayoutManagers}. @pa

Notifies when all pending or running animations in an ItemAnimator are finished.

Called when an item view is attached to this RecyclerView. <p>Subclasses of RecyclerView may want to perform extra bookkeeping or modifications of ch

Called when searching for a focusable view in the given direction has failed for the current content of the RecyclerView. <p>This is the LayoutManage

Silently observe and/or take over touch events sent to the RecyclerView before they are handled by either the RecyclerView itself or its child views.

Lay out all relevant child views from the given adapter. The LayoutManager is in charge of the behavior of item animations. By default, RecyclerView

This method is called whenever the view in the ViewHolder is recycled. RecyclerView calls this method right before clearing ViewHolder's internal dat

遍历mPendingUpdates

在onMeasure和dispatchLayout1和dispatchLayout2中调用

Used as a fast path for unscrapping and recycling a view during a bulk operation. The caller must call {@link #clearScrap()} when it's done to update

Records the animation information for a view holder that was bounced from hidden list. It also clears the bounce back flag.

Helper method to call appropriate recycle method depending on current layout direction @param recycler Current recycler that is attached to Recycl

Recycle a detached view. The specified view will be added to a pool of views for later rebinding and reuse. <p>A view must be fully detached (removed

Remove a view from the currently attached RecyclerView if needed. LayoutManagers should use this method to completely remove a child view that is no l

Requests that the given child of the RecyclerView be positioned onto the screen. This method can be called for both unfocusable and focusable child vi

Mark an attached view as scrap. <p>"Scrap" views are still attached to their parent RecyclerView but are eligible for rebinding and reuse. Requests f

Scroll horizontally by dx pixels in screen coordinates and return the distance traveled. The default implementation does nothing and returns 0. @para

Convenience method to scroll to a certain position. RecyclerView does not implement scrolling logic, rather forwards the call to {@link android.suppo

Scroll vertically by dy pixels in screen coordinates and return the distance traveled. The default implementation does nothing and returns 0. @param