Module snapshot 

The snapshot payload: the result of a snapshot request.

Class names, package names and resource-id prefixes live once in the snapshot’s string table and nodes refer to them by index; enums are integers and node states a bitmask (design D4). Snapshots, windows, nodes and scroll semantics are maps keyed by field index; bounds, scroll ranges and scroll positions are positional arrays.

Structs

Bounds

A screen rectangle in pixels, on the wire [left, top, right, bottom].

Node

One accessibility node.

NodeFlags

Node states.

Scroll

Scroll semantics of a node that scrolls: the axis, whether it can scroll back toward the start of its content and forward toward its end from where it is, and, where the platform reports them, the range its content spans and the part of that range inside its viewport, both in the range’s unit.

ScrollAxis

The direction a node scrolls in.

ScrollFlags

Which ways a node can scroll from where it is.

ScrollPosition

The part of a ScrollRange inside the viewport, on the wire [first, last], both inclusive: [0, 15] while the first 16 items of a list are in view.

ScrollRange

The range a scrolling node’s content spans, on the wire [unit, min, max], both ends inclusive: [items, 0, 199] for a list of 200 items.

ScrollUnit

What a ScrollRange counts.

Snapshot

One tree read across the interactive windows.

Truncation

Which request bounds cut a snapshot short.

Window

One window and its node tree.

WindowFlags

Window states.

WindowType

The kind of a window, with Android’s AccessibilityWindowInfo.TYPE_* values.

Constants

MAX_NODE_DEPTH

How deeply nodes may nest below a window root; agents cap their walk at this depth and decoders reject deeper trees. The decoder keeps its own stack of open nodes on the heap, so a deep tree never exhausts the thread stack.