Returns true if layout and scroll are frozen. @return true if layout and scroll are frozen @see #setLayoutFrozen(boolean)

In addition to the View Framework's measurement cache, RecyclerView uses its own additional measurement cache for its children to avoid re-measuring t

Returns true if the RecyclerView is currently measuring the layout. This value is {@code true} only if the LayoutManager opted into the auto measure A

Returns the current state of the smooth scrollbar feature. It is enabled by default. @return True if smooth scrollbar is enabled, false otherwise. @s

Returns whether the given child view is partially or fully visible within the padded bounded area of RecyclerView, depending on the input parameters.

Instead of specifying pixels to scroll, use the target position to jump using {@link RecyclerView#scrollToPosition(int)}. <p> You may prefer using thi

Lay out the given child view within the RecyclerView using coordinates that include any current {@link ItemDecoration ItemDecorations}. <p>LayoutMana

Measure a child view using standard measurement policy, taking the padding of the parent RecyclerView and any added item decorations into account. <p

Normalizes the vector. @param scrollVector The vector that points to the target scroll position

Notify any registered observers that the item reflected at <code>position</code> has been newly inserted. The item previously at <code>position</code>

Notify any registered observers that the item reflected at <code>fromPosition</code> has been moved to <code>toPosition</code>. <p>This is a structur

Offsets the child in this orientation. @param view View to offset @param offset offset amount

Offset all child views attached to the parent RecyclerView by dx pixels along the horizontal axis. @param dx Pixels to offset by

Offset all child views attached to the parent RecyclerView by dy pixels along the vertical axis. @param dy Pixels to offset by

@param removedFrom Remove start index @param count Remove count @param applyToPreLayout If true, changes will affect ViewHolder's pre-layout position,

Detaches the old adapter and attaches the new one. <p> RecycledViewPool will clear its cache if it has only one adapter attached and the new adapter u

notifydatasetchange调用的方法

Draw any appropriate decorations into the Canvas supplied to the RecyclerView. Any content drawn by this method will be drawn before the item views ar

@return True if updates should be processed.

@return True if updates should be processed.

@return True if updates should be processed.

@return True if updates should be processed.

{@inheritDoc}

Measure the attached RecyclerView. Implementations must call {@link #setMeasuredDimension(int, int)} before returning. <p>The default implementation

<p>Called when the LayoutManager should save its state. This is a good time to save your scroll position, configuration and anything else that may be

RecyclerView calls this method to notify LayoutManager that scroll state has changed. @param state The new scroll state for RecyclerView

Callback method to be invoked when RecyclerView's scroll state changes. @param recyclerView The RecyclerView whose scroll state has changed. @param n

Callback method to be invoked when the RecyclerView has been scrolled. This will be called after the scroll has completed. <p> This callback will also

Called when a view created by this adapter has been recycled. <p>A view is recycled when a {@link LayoutManager} decides that it no longer needs to b

@hide This method should be called by ItemTouchHelper only.

Prepare for a prefetch occurring on the RecyclerView in between traversals, potentially prior to any layout passes. <p>Don't touch any state stored b