Expose prefetching strategies to services (026c7ac0) · Commits · e / os / android_frameworks_base

core/api/current.txt

+12 −0

Original line number	Diff line number	Diff line
		@@ -3061,6 +3061,7 @@ package android.accessibilityservice {
		method @NonNull @RequiresPermission(android.Manifest.permission.USE_FINGERPRINT) public final android.accessibilityservice.FingerprintGestureController getFingerprintGestureController();
		method @NonNull public final android.accessibilityservice.AccessibilityService.MagnificationController getMagnificationController();
		method public android.view.accessibility.AccessibilityNodeInfo getRootInActiveWindow();
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getRootInActiveWindow(int);
		method public final android.accessibilityservice.AccessibilityServiceInfo getServiceInfo();
		method @NonNull public final android.accessibilityservice.AccessibilityService.SoftKeyboardController getSoftKeyboardController();
		method @NonNull public final java.util.List<android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction> getSystemActions();
		@@ -51585,6 +51586,7 @@ package android.view.accessibility {
		method @Deprecated public void getBoundsInParent(android.graphics.Rect);
		method public void getBoundsInScreen(android.graphics.Rect);
		method public android.view.accessibility.AccessibilityNodeInfo getChild(int);
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getChild(int, int);
		method public int getChildCount();
		method public CharSequence getClassName();
		method public android.view.accessibility.AccessibilityNodeInfo.CollectionInfo getCollectionInfo();
		@@ -51604,6 +51606,7 @@ package android.view.accessibility {
		method public CharSequence getPackageName();
		method @Nullable public CharSequence getPaneTitle();
		method public android.view.accessibility.AccessibilityNodeInfo getParent();
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getParent(int);
		method public android.view.accessibility.AccessibilityNodeInfo.RangeInfo getRangeInfo();
		method @Nullable public CharSequence getStateDescription();
		method public CharSequence getText();
		@@ -51754,8 +51757,15 @@ package android.view.accessibility {
		field public static final int EXTRA_DATA_TEXT_CHARACTER_LOCATION_ARG_MAX_LENGTH = 20000; // 0x4e20
		field public static final String EXTRA_DATA_TEXT_CHARACTER_LOCATION_ARG_START_INDEX = "android.view.accessibility.extra.DATA_TEXT_CHARACTER_LOCATION_ARG_START_INDEX";
		field public static final String EXTRA_DATA_TEXT_CHARACTER_LOCATION_KEY = "android.view.accessibility.extra.DATA_TEXT_CHARACTER_LOCATION_KEY";
		field public static final int FLAG_PREFETCH_ANCESTORS = 1; // 0x1
		field public static final int FLAG_PREFETCH_DESCENDANTS_BREADTH_FIRST = 16; // 0x10
		field public static final int FLAG_PREFETCH_DESCENDANTS_DEPTH_FIRST = 8; // 0x8
		field public static final int FLAG_PREFETCH_DESCENDANTS_HYBRID = 4; // 0x4
		field public static final int FLAG_PREFETCH_SIBLINGS = 2; // 0x2
		field public static final int FLAG_PREFETCH_UNINTERRUPTIBLE = 32; // 0x20
		field public static final int FOCUS_ACCESSIBILITY = 2; // 0x2
		field public static final int FOCUS_INPUT = 1; // 0x1
		field public static final int MAX_NUMBER_OF_PREFETCHED_NODES = 50; // 0x32
		field public static final int MOVEMENT_GRANULARITY_CHARACTER = 1; // 0x1
		field public static final int MOVEMENT_GRANULARITY_LINE = 4; // 0x4
		field public static final int MOVEMENT_GRANULARITY_PAGE = 16; // 0x10
		@@ -51920,6 +51930,7 @@ package android.view.accessibility {
		method public int getScrollX();
		method public int getScrollY();
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getSource();
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getSource(int);
		method @NonNull public java.util.List<java.lang.CharSequence> getText();
		method public int getToIndex();
		method public int getWindowId();
		@@ -51977,6 +51988,7 @@ package android.view.accessibility {
		method public android.view.accessibility.AccessibilityWindowInfo getParent();
		method public void getRegionInScreen(@NonNull android.graphics.Region);
		method public android.view.accessibility.AccessibilityNodeInfo getRoot();
		method @Nullable public android.view.accessibility.AccessibilityNodeInfo getRoot(int);
		method @Nullable public CharSequence getTitle();
		method public int getType();
		method public boolean isAccessibilityFocused();

core/java/android/accessibilityservice/AccessibilityService.java

+20 −9

Original line number	Diff line number	Diff line
		@@ -969,14 +969,6 @@ public abstract class AccessibilityService extends Service {
		* is currently touching or the window with input focus, if the user is not
		* touching any window. It could be from any logical display.
		* <p>
		* The currently active window is defined as the window that most recently fired one
		* of the following events:
		* {@link AccessibilityEvent#TYPE_WINDOW_STATE_CHANGED},
		* {@link AccessibilityEvent#TYPE_VIEW_HOVER_ENTER},
		* {@link AccessibilityEvent#TYPE_VIEW_HOVER_EXIT}.
		* In other words, the last window shown that also has input focus.
		* </p>
		* <p>
		* <strong>Note:</strong> In order to access the root node your service has
		* to declare the capability to retrieve window content by setting the
		* {@link android.R.styleable#AccessibilityService_canRetrieveWindowContent}
		@@ -984,10 +976,29 @@ public abstract class AccessibilityService extends Service {
		* </p>
		*
		* @return The root node if this service can retrieve window content.
		* @see AccessibilityWindowInfo#isActive() for more explanation about the active window.
		*/
		public AccessibilityNodeInfo getRootInActiveWindow() {
		return getRootInActiveWindow(AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_HYBRID);
		}

		/**
		* Gets the root node in the currently active window if this service
		* can retrieve window content. The active window is the one that the user
		* is currently touching or the window with input focus, if the user is not
		* touching any window. It could be from any logical display.
		*
		* @param prefetchingStrategy the prefetching strategy.
		* @return The root node if this service can retrieve window content.
		*
		* @see #getRootInActiveWindow()
		* @see AccessibilityNodeInfo#getParent(int) for a description of prefetching.
		*/
		@Nullable
		public AccessibilityNodeInfo getRootInActiveWindow(
		@AccessibilityNodeInfo.PrefetchingStrategy int prefetchingStrategy) {
		return AccessibilityInteractionClient.getInstance(this).getRootInActiveWindow(
		mConnectionId);
		mConnectionId, prefetchingStrategy);
		}

		/**

core/java/android/app/UiAutomation.java

+2 −1

Original line number	Diff line number	Diff line
		@@ -728,7 +728,8 @@ public final class UiAutomation {
		}
		// Calling out without a lock held.
		return AccessibilityInteractionClient.getInstance()
		.getRootInActiveWindow(connectionId);
		.getRootInActiveWindow(connectionId,
		AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_HYBRID);
		}

		/**

core/java/android/view/AccessibilityInteractionController.java

+263 −36

Original line number	Diff line number	Diff line
		@@ -52,9 +52,10 @@ import com.android.internal.annotations.GuardedBy;
		import com.android.internal.annotations.VisibleForTesting;
		import com.android.internal.os.SomeArgs;

		import java.util.ArrayDeque;
		import java.util.ArrayList;
		import java.util.HashMap;
		import java.util.HashSet;
		import java.util.LinkedHashMap;
		import java.util.LinkedList;
		import java.util.List;
		import java.util.Map;
		@@ -348,6 +349,11 @@ public final class AccessibilityInteractionController {

		View requestedView = null;
		AccessibilityNodeInfo requestedNode = null;
		boolean interruptPrefetch =
		((flags & AccessibilityNodeInfo.FLAG_PREFETCH_UNINTERRUPTIBLE) == 0);

		ArrayList<AccessibilityNodeInfo> infos = mTempAccessibilityNodeInfoList;
		infos.clear();
		try {
		if (mViewRootImpl.mView == null \|\| mViewRootImpl.mAttachInfo == null) {
		return;
		@@ -357,27 +363,46 @@ public final class AccessibilityInteractionController {
		if (requestedView != null && isShown(requestedView)) {
		requestedNode = populateAccessibilityNodeInfoForView(
		requestedView, arguments, virtualDescendantId);
		mPrefetcher.mInterruptPrefetch = interruptPrefetch;
		mPrefetcher.mFetchFlags = flags & AccessibilityNodeInfo.FLAG_PREFETCH_MASK;

		if (!interruptPrefetch) {
		infos.add(requestedNode);
		mPrefetcher.prefetchAccessibilityNodeInfos(requestedView,
		requestedNode == null ? null : new AccessibilityNodeInfo(requestedNode),
		infos);
		mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = 0;
		}
		}
		} finally {
		if (!interruptPrefetch) {
		// Return found node and prefetched nodes in one IPC.
		updateInfosForViewportAndReturnFindNodeResult(infos, callback, interactionId, spec,
		interactiveRegion);

		final SatisfiedFindAccessibilityNodeByAccessibilityIdRequest satisfiedRequest =
		getSatisfiedRequestInPrefetch(requestedNode == null ? null : requestedNode,
		infos, flags);
		if (satisfiedRequest != null) {
		returnFindNodeResult(satisfiedRequest);
		}
		return;
		} else {
		// Return found node.
		updateInfoForViewportAndReturnFindNodeResult(
		requestedNode == null ? null : AccessibilityNodeInfo.obtain(requestedNode),
		requestedNode == null ? null : new AccessibilityNodeInfo(requestedNode),
		callback, interactionId, spec, interactiveRegion);
		}
		ArrayList<AccessibilityNodeInfo> infos = mTempAccessibilityNodeInfoList;
		infos.clear();
		}
		mPrefetcher.prefetchAccessibilityNodeInfos(requestedView,
		requestedNode == null ? null : AccessibilityNodeInfo.obtain(requestedNode),
		virtualDescendantId, flags, infos);
		requestedNode == null ? null : new AccessibilityNodeInfo(requestedNode), infos);
		mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = 0;
		updateInfosForViewPort(infos, spec, interactiveRegion);
		final SatisfiedFindAccessibilityNodeByAccessibilityIdRequest satisfiedRequest =
		getSatisfiedRequestInPrefetch(
		requestedNode == null ? null : requestedNode, infos, flags);

		if (satisfiedRequest != null && satisfiedRequest.mSatisfiedRequestNode != requestedNode) {
		infos.remove(satisfiedRequest.mSatisfiedRequestNode);
		}
		getSatisfiedRequestInPrefetch(requestedNode == null ? null : requestedNode, infos,
		flags);

		// Return prefetch result separately.
		returnPrefetchResult(interactionId, infos, callback);

		if (satisfiedRequest != null) {
		@@ -1077,6 +1102,11 @@ public final class AccessibilityInteractionController {
		}
		}
		mPendingFindNodeByIdMessages.clear();
		// Remove node from prefetched infos.
		if (satisfiedRequest != null && satisfiedRequest.mSatisfiedRequestNode
		!= requestedNode) {
		infos.remove(satisfiedRequest.mSatisfiedRequestNode);
		}
		return satisfiedRequest;
		}
		}
		@@ -1149,45 +1179,76 @@ public final class AccessibilityInteractionController {
		*/
		private class AccessibilityNodePrefetcher {

		private static final int MAX_ACCESSIBILITY_NODE_INFO_BATCH_SIZE = 50;

		private final ArrayList<View> mTempViewList = new ArrayList<View>();
		private boolean mInterruptPrefetch;
		private int mFetchFlags;

		public void prefetchAccessibilityNodeInfos(View view, AccessibilityNodeInfo root,
		int virtualViewId, int fetchFlags, List<AccessibilityNodeInfo> outInfos) {
		List<AccessibilityNodeInfo> outInfos) {
		if (root == null) {
		return;
		}
		AccessibilityNodeProvider provider = view.getAccessibilityNodeProvider();
		final boolean prefetchPredecessors =
		isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_ANCESTORS);
		if (provider == null) {
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_PREDECESSORS) != 0) {
		if (prefetchPredecessors) {
		prefetchPredecessorsOfRealNode(view, outInfos);
		}
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_SIBLINGS) != 0) {
		prefetchSiblingsOfRealNode(view, outInfos);
		if (isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_SIBLINGS)) {
		prefetchSiblingsOfRealNode(view, outInfos, prefetchPredecessors);
		}
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS) != 0) {
		if (isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_HYBRID)) {
		prefetchDescendantsOfRealNode(view, outInfos);
		}
		} else {
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_PREDECESSORS) != 0) {
		if (prefetchPredecessors) {
		prefetchPredecessorsOfVirtualNode(root, view, provider, outInfos);
		}
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_SIBLINGS) != 0) {
		prefetchSiblingsOfVirtualNode(root, view, provider, outInfos);
		if (isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_SIBLINGS)) {
		prefetchSiblingsOfVirtualNode(root, view, provider, outInfos,
		prefetchPredecessors);
		}
		if ((fetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS) != 0) {
		if (isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_HYBRID)) {
		prefetchDescendantsOfVirtualNode(root, provider, outInfos);
		}
		}
		if (isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_DEPTH_FIRST)
		\|\| isFlagSet(AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_BREADTH_FIRST)) {
		if (shouldStopPrefetching(outInfos)) {
		return;
		}
		PrefetchDeque<DequeNode> deque = new PrefetchDeque<>(
		mFetchFlags & AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_MASK,
		outInfos);
		addChildrenOfRoot(view, root, provider, deque);
		deque.performTraversalAndPrefetch();
		}
		if (ENFORCE_NODE_TREE_CONSISTENT) {
		enforceNodeTreeConsistent(root, outInfos);
		}
		}

		private boolean shouldStopPrefetching(List prefetchededInfos) {
		return mHandler.hasUserInteractiveMessagesWaiting()
		\|\| prefetchededInfos.size() >= MAX_ACCESSIBILITY_NODE_INFO_BATCH_SIZE;
		private void addChildrenOfRoot(View root, AccessibilityNodeInfo rootInfo,
		AccessibilityNodeProvider rootProvider, PrefetchDeque deque) {
		DequeNode rootDequeNode;
		if (rootProvider == null) {
		rootDequeNode = new ViewNode(root);
		} else {
		rootDequeNode = new VirtualNode(
		AccessibilityNodeProvider.HOST_VIEW_ID, rootProvider);
		}
		rootDequeNode.addChildren(rootInfo, deque);
		}

		private boolean isFlagSet(@AccessibilityNodeInfo.PrefetchingStrategy int strategy) {
		return (mFetchFlags & strategy) != 0;
		}

		public boolean shouldStopPrefetching(List prefetchedInfos) {
		return ((mHandler.hasUserInteractiveMessagesWaiting() && mInterruptPrefetch)
		\|\| prefetchedInfos.size()
		>= AccessibilityNodeInfo.MAX_NUMBER_OF_PREFETCHED_NODES);
		}

		private void enforceNodeTreeConsistent(
		@@ -1283,7 +1344,7 @@ public final class AccessibilityInteractionController {
		}

		private void prefetchSiblingsOfRealNode(View current,
		List<AccessibilityNodeInfo> outInfos) {
		List<AccessibilityNodeInfo> outInfos, boolean predecessorsPrefetched) {
		if (shouldStopPrefetching(outInfos)) {
		return;
		}
		@@ -1293,6 +1354,13 @@ public final class AccessibilityInteractionController {
		ArrayList<View> children = mTempViewList;
		children.clear();
		try {
		if (!predecessorsPrefetched) {
		AccessibilityNodeInfo parentInfo =
		((ViewGroup) parent).createAccessibilityNodeInfo();
		if (parentInfo != null) {
		outInfos.add(parentInfo);
		}
		}
		parentGroup.addChildrenForAccessibility(children);
		final int childCount = children.size();
		for (int i = 0; i < childCount; i++) {
		@@ -1327,8 +1395,8 @@ public final class AccessibilityInteractionController {
		if (shouldStopPrefetching(outInfos) \|\| !(root instanceof ViewGroup)) {
		return;
		}
		HashMap<View, AccessibilityNodeInfo> addedChildren =
		new HashMap<View, AccessibilityNodeInfo>();
		LinkedHashMap<View, AccessibilityNodeInfo> addedChildren =
		new LinkedHashMap<View, AccessibilityNodeInfo>();
		ArrayList<View> children = mTempViewList;
		children.clear();
		try {
		@@ -1414,7 +1482,8 @@ public final class AccessibilityInteractionController {
		}

		private void prefetchSiblingsOfVirtualNode(AccessibilityNodeInfo current, View providerHost,
		AccessibilityNodeProvider provider, List<AccessibilityNodeInfo> outInfos) {
		AccessibilityNodeProvider provider, List<AccessibilityNodeInfo> outInfos,
		boolean predecessorsPrefetched) {
		final long parentNodeId = current.getParentNodeId();
		final int parentAccessibilityViewId =
		AccessibilityNodeInfo.getAccessibilityViewId(parentNodeId);
		@@ -1425,6 +1494,9 @@ public final class AccessibilityInteractionController {
		final AccessibilityNodeInfo parent =
		provider.createAccessibilityNodeInfo(parentVirtualDescendantId);
		if (parent != null) {
		if (!predecessorsPrefetched) {
		outInfos.add(parent);
		}
		final int childCount = parent.getChildCount();
		for (int i = 0; i < childCount; i++) {
		if (shouldStopPrefetching(outInfos)) {
		@@ -1443,7 +1515,7 @@ public final class AccessibilityInteractionController {
		}
		}
		} else {
		prefetchSiblingsOfRealNode(providerHost, outInfos);
		prefetchSiblingsOfRealNode(providerHost, outInfos, predecessorsPrefetched);
		}
		}

		@@ -1626,4 +1698,159 @@ public final class AccessibilityInteractionController {
		mSatisfiedRequestInteractionId = satisfiedRequestInteractionId;
		}
		}

		private class PrefetchDeque<E extends DequeNode>
		extends ArrayDeque<E> {
		int mStrategy;
		List<AccessibilityNodeInfo> mPrefetchOutput;

		PrefetchDeque(int strategy, List<AccessibilityNodeInfo> output) {
		mStrategy = strategy;
		mPrefetchOutput = output;
		}

		/** Performs depth-first or breadth-first traversal.
		*
		* For depth-first search, we iterate through the children in backwards order and push them
		* to the stack before taking from the head. For breadth-first search, we iterate through
		* the children in order and push them to the stack before taking from the tail.
		*
		* Depth-first search: 0 has children 0, 1, 2, 4. 1 has children 5 and 6.
		* Head Tail
		* 1 2 3 4 -> pop: 1 -> 5 6 2 3 4
		*
		* Breadth-first search
		* Head Tail
		* 4 3 2 1 -> remove last: 1 -> 6 5 3 2
		*
		**/
		void performTraversalAndPrefetch() {
		try {
		while (!isEmpty()) {
		E child = getNext();
		AccessibilityNodeInfo childInfo = child.getA11yNodeInfo();
		if (childInfo != null) {
		mPrefetchOutput.add(childInfo);
		}
		if (mPrefetcher.shouldStopPrefetching(mPrefetchOutput)) {
		return;
		}
		// Add children to deque.
		child.addChildren(childInfo, this);
		}
		} finally {
		clear();
		}
		}

		E getNext() {
		if (isStack()) {
		return pop();
		}
		return removeLast();
		}

		boolean isStack() {
		return (mStrategy & AccessibilityNodeInfo.FLAG_PREFETCH_DESCENDANTS_DEPTH_FIRST) != 0;
		}
		}

		interface DequeNode {
		AccessibilityNodeInfo getA11yNodeInfo();
		void addChildren(AccessibilityNodeInfo virtualRoot, PrefetchDeque deque);
		}

		private class ViewNode implements DequeNode {
		View mView;
		private final ArrayList<View> mTempViewList = new ArrayList<>();

		ViewNode(View view) {
		mView = view;
		}

		@Override
		public AccessibilityNodeInfo getA11yNodeInfo() {
		if (mView == null) {
		return null;
		}
		return mView.createAccessibilityNodeInfo();
		}

		@Override
		public void addChildren(AccessibilityNodeInfo virtualRoot, PrefetchDeque deque) {
		if (mView == null) {
		return;
		}
		if (!(mView instanceof ViewGroup)) {
		return;
		}
		ArrayList<View> children = mTempViewList;
		children.clear();
		try {
		mView.addChildrenForAccessibility(children);
		final int childCount = children.size();

		if (deque.isStack()) {
		for (int i = childCount - 1; i >= 0; i--) {
		addChild(deque, children.get(i));
		}
		} else {
		for (int i = 0; i < childCount; i++) {
		addChild(deque, children.get(i));
		}
		}
		} finally {
		children.clear();
		}
		}

		private void addChild(ArrayDeque deque, View child) {
		if (isShown(child)) {
		AccessibilityNodeProvider provider = child.getAccessibilityNodeProvider();
		if (provider == null) {
		deque.push(new ViewNode(child));
		} else {
		deque.push(new VirtualNode(AccessibilityNodeProvider.HOST_VIEW_ID,
		provider));
		}
		}
		}
		}

		private class VirtualNode implements DequeNode {
		long mInfoId;
		AccessibilityNodeProvider mProvider;

		VirtualNode(long id, AccessibilityNodeProvider provider) {
		mInfoId = id;
		mProvider = provider;
		}
		@Override
		public AccessibilityNodeInfo getA11yNodeInfo() {
		if (mProvider == null) {
		return null;
		}
		return mProvider.createAccessibilityNodeInfo(
		AccessibilityNodeInfo.getVirtualDescendantId(mInfoId));
		}

		@Override
		public void addChildren(AccessibilityNodeInfo virtualRoot, PrefetchDeque deque) {
		if (virtualRoot == null) {
		return;
		}
		final int childCount = virtualRoot.getChildCount();
		if (deque.isStack()) {
		for (int i = childCount - 1; i >= 0; i--) {
		final long childNodeId = virtualRoot.getChildId(i);
		deque.push(new VirtualNode(childNodeId, mProvider));
		}
		} else {
		for (int i = 0; i < childCount; i++) {
		final long childNodeId = virtualRoot.getChildId(i);
		deque.push(new VirtualNode(childNodeId, mProvider));
		}
		}
		}
		}
		}

core/java/android/view/accessibility/AccessibilityInteractionClient.java

+49 −25

File changed.

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