Called by the RecyclerView after the layout is complete. Item animator should record necessary information about the View's final state. <p> The data

Recycles views that went out of bounds after scrolling towards the start of the layout. <p> Checks both layout position and visible position to guaran

Recycles views that went out of bounds after scrolling towards the end of the layout. <p> Checks both layout position and visible position to guarante

Register a new observer to listen for data changes. <p>The adapter may publish a variety of events describing specific changes. Not all adapters may

Remove a child view and recycle it using the given Recycler. @param child Child to remove and recycle @param recycler Recycler to use to recycle chil

Removes and recycles all views - both those currently attached, and those in the Recycler.

Removes a view from the animatingViews list. @param view The view to be removed @see #addAnimatingView(RecyclerView.ViewHolder) @return true if an ani

Remove an {@link ItemDecoration} from this RecyclerView. <p>The given decoration will no longer impact the measurement and drawing of item views.</p>

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

Called when there are pending animations waiting to be started. This state is governed by the return values from {@link #animateAppearance(ViewHolder,

Sets the accessibility delegate compatibility implementation used by RecyclerView. @param accessibilityDelegate The accessibility delegate to be used

Set whether LayoutManager will recycle its children when it is detached from RecyclerView. <p> If you are using a {@link RecyclerView.RecycledViewPool

Recycled view pools allow multiple RecyclerViews to share a common pool of scrap views. This can be useful if you have multiple RecyclerViews with ada

Compatibility support for {@link android.widget.AbsListView#setStackFromBottom(boolean)}

Set the maximum number of detached, valid views we should retain for later use. @param viewCount Number of views to keep before sending views to the

Returns whether we have animations referring to this view holder or not. This is similar to isRecyclable flag but does not check transient state.

Returns true if an accessibility event should not be dispatched now. This happens when an accessibility request arrives while RecyclerView does not ha

Internal API to allow LayoutManagers to be measured twice. <p> This is not public because LayoutManagers should be able to handle their layouts in one

Starts a smooth scroll for the given target position. <p>In each animation step, {@link RecyclerView} will check for the target view and call either {

<p>Starts a smooth scroll using the provided SmoothScroller.</p> <p>Calling this method will cancel any previous smooth scroll request.</p> @param smo

Returns whether this LayoutManager supports automatic item animations. A LayoutManager wishing to support item animations should obey certain rules as

注释写的很清楚，从Recycler的scrap，cache，RecyclerViewPool,或者直接create创建

Unregister an observer currently listening for data changes. <p>The unregistered observer will no longer receive events about changes to the adapter.

Finds an anchor child from existing Views. Most of the time, this is the view closest to start or end that has a valid position (e.g. not removed). <p

If there is a pending scroll position or saved states, updates the anchor info from that data and returns true

Helper method for getViewForPosition. <p> Checks whether a given view holder can be used for the provided position. @param holder ViewHolder @return

Rebind existing views for the given range, or create as needed. @param positionStart Adapter position to start at @param itemCount Number of views th

Returns whether RecyclerView will run predictive animations in this layout pass or not. @return true if RecyclerView is calculating predictive animat

@param dx Pixels to scroll horizontally @param dy Pixels to scroll vertically

Creates a vertical LinearLayoutManager @param context Current context, will be used to access resources.

called by CREATOR

Add an {@link ItemDecoration} to this RecyclerView. Item decorations can affect both measurement and drawing of individual item views. <p>Item decora

Register a listener that will be notified whenever a child view is attached to or detached from RecyclerView. <p>This listener will be called when a

Add an {@link OnItemTouchListener} to intercept touch events before they are dispatched to child views or this view's standard scrolling behavior. <p

Add a view to the currently attached RecyclerView if needed. LayoutManagers should use this method to add views obtained from a {@link Recycler} using

Checks if RecyclerView is in the middle of a layout or scroll and throws an {@link IllegalStateException} if it <b>is not</b>. @param message The mes

Checks if RecyclerView is in the middle of a layout or scroll and throws an {@link IllegalStateException} if it <b>is not</b>. @param message The mes

Binds the given View to the position. The View can be a View previously retrieved via {@link #getViewForPosition(int)} or created by {@link Adapter#on

Calculates the item decor insets applied to the given child and updates the provided Rect instance with the inset values. <ul> <li>The Rect's left

@return true if {@link #getOrientation()} is {@link #HORIZONTAL}

@return true if {@link #getOrientation()} is {@link #VERTICAL}

Determines the validity of the supplied LayoutParams object. <p>This should check to make sure that the object is of the correct type and all values

Removes all listeners that were added via {@link #addOnChildAttachStateChangeListener(OnChildAttachStateChangeListener)}.

Remove all secondary listener that were notified of any changes in scroll state or position.

Gather all positions from the LayoutManager to be prefetched, given specified momentum. <p>If item prefetch is enabled, this method is called in betw

Gather all positions from the LayoutManager to be prefetched in preperation for its RecyclerView to come on screen, due to the movement of another, co

<p>Compute the horizontal extent of the horizontal scrollbar's thumb within the horizontal range. This value is used to compute the length of the thum

<p>Override this method if you want to support scroll bars.</p> <p>Read {@link RecyclerView#computeHorizontalScrollExtent()} for details.</p> <p>Def

<p>Compute the horizontal offset of the horizontal scrollbar's thumb within the horizontal range. This value is used to compute the length of the thum

<p>Override this method if you want to support scroll bars.</p> <p>Read {@link RecyclerView#computeHorizontalScrollOffset()} for details.</p> <p>Def