Merge "Adding explicit text traversal granularities and actions for web navigation." (9ca10c8c) · Commits · e / os / android_frameworks_base

api/current.txt

+14 −3

Original line number	Diff line number	Diff line
		@@ -24930,6 +24930,7 @@ package android.view.accessibility {
		method public static java.lang.String eventTypeToString(int);
		method public long getEventTime();
		method public int getEventType();
		method public int getGranularity();
		method public java.lang.CharSequence getPackageName();
		method public android.view.accessibility.AccessibilityRecord getRecord(int);
		method public int getRecordCount();
		@@ -24939,6 +24940,7 @@ package android.view.accessibility {
		method public static android.view.accessibility.AccessibilityEvent obtain();
		method public void setEventTime(long);
		method public void setEventType(int);
		method public void setGranularity(int);
		method public void setPackageName(java.lang.CharSequence);
		method public void writeToParcel(android.os.Parcel, int);
		field public static final android.os.Parcelable.Creator CREATOR;
		@@ -24960,6 +24962,7 @@ package android.view.accessibility {
		field public static final int TYPE_VIEW_SELECTED = 4; // 0x4
		field public static final int TYPE_VIEW_TEXT_CHANGED = 16; // 0x10
		field public static final int TYPE_VIEW_TEXT_SELECTION_CHANGED = 8192; // 0x2000
		field public static final int TYPE_VIEW_TEXT_TRAVERSED_AT_GRANULARITY = 131072; // 0x20000
		field public static final int TYPE_WINDOW_CONTENT_CHANGED = 2048; // 0x800
		field public static final int TYPE_WINDOW_STATE_CHANGED = 32; // 0x20
		}
		@@ -25000,7 +25003,7 @@ package android.view.accessibility {
		method public int getChildCount();
		method public java.lang.CharSequence getClassName();
		method public java.lang.CharSequence getContentDescription();
		method public java.lang.CharSequence[] getGranularities();
		method public int getGranularities();
		method public java.lang.CharSequence getPackageName();
		method public android.view.accessibility.AccessibilityNodeInfo getParent();
		method public java.lang.CharSequence getText();
		@@ -25034,7 +25037,7 @@ package android.view.accessibility {
		method public void setEnabled(boolean);
		method public void setFocusable(boolean);
		method public void setFocused(boolean);
		method public void setGranularities(java.lang.CharSequence[]);
		method public void setGranularities(int);
		method public void setLongClickable(boolean);
		method public void setPackageName(java.lang.CharSequence);
		method public void setParent(android.view.View);
		@@ -25047,7 +25050,8 @@ package android.view.accessibility {
		method public void setText(java.lang.CharSequence);
		method public void writeToParcel(android.os.Parcel, int);
		field public static final int ACTION_ACCESSIBILITY_FOCUS = 64; // 0x40
		field public static final java.lang.String ACTION_ARGUMENT_GRANULARITY = "ACTION_ARGUMENT_GRANULARITY";
		field public static final java.lang.String ACTION_ARGUMENT_GRANULARITY_INT = "ACTION_ARGUMENT_GRANULARITY_INT";
		field public static final java.lang.String ACTION_ARGUMENT_HTML_ELEMENT_STRING = "ACTION_ARGUMENT_HTML_ELEMENT_STRING";
		field public static final int ACTION_CLEAR_ACCESSIBILITY_FOCUS = 128; // 0x80
		field public static final int ACTION_CLEAR_FOCUS = 2; // 0x2
		field public static final int ACTION_CLEAR_SELECTION = 8; // 0x8
		@@ -25055,11 +25059,18 @@ package android.view.accessibility {
		field public static final int ACTION_FOCUS = 1; // 0x1
		field public static final int ACTION_LONG_CLICK = 32; // 0x20
		field public static final int ACTION_NEXT_AT_GRANULARITY = 256; // 0x100
		field public static final int ACTION_NEXT_HTML_ELEMENT = 1024; // 0x400
		field public static final int ACTION_PREVIOUS_AT_GRANULARITY = 512; // 0x200
		field public static final int ACTION_PREVIOUS_HTML_ELEMENT = 2048; // 0x800
		field public static final int ACTION_SELECT = 4; // 0x4
		field public static final android.os.Parcelable.Creator CREATOR;
		field public static final int FOCUS_ACCESSIBILITY = 2; // 0x2
		field public static final int FOCUS_INPUT = 1; // 0x1
		field public static final int GRANULARITY_CHARACTER = 1; // 0x1
		field public static final int GRANULARITY_LINE = 4; // 0x4
		field public static final int GRANULARITY_PAGE = 16; // 0x10
		field public static final int GRANULARITY_PARAGRAPH = 8; // 0x8
		field public static final int GRANULARITY_WORD = 2; // 0x2
		}

		public abstract class AccessibilityNodeProvider {

core/java/android/view/accessibility/AccessibilityEvent.java

+52 −0

Original line number	Diff line number	Diff line
		@@ -226,6 +226,23 @@ import java.util.List;
		* <li>{@link #getContentDescription()} - The content description of the source.</li>
		* </ul>
		* </p>
		* <b>View text traversed at granularity</b> - represents the event of traversing the
		* text of a view at a given granularity. For example, moving to the next word.</br>
		* <em>Type:</em> {@link #TYPE_VIEW_TEXT_TRAVERSED_AT_GRANULARITY} </br>
		* <em>Properties:</em></br>
		* <ul>
		* <li>{@link #getEventType()} - The type of the event.</li>
		* <li>{@link #getSource()} - The source info (for registered clients).</li>
		* <li>{@link #getClassName()} - The class name of the source.</li>
		* <li>{@link #getPackageName()} - The package name of the source.</li>
		* <li>{@link #getEventTime()} - The event time.</li>
		* <li>{@link #getText()} - The text of the current text at the granularity.</li>
		* <li>{@link #isPassword()} - Whether the source is password.</li>
		* <li>{@link #isEnabled()} - Whether the source is enabled.</li>
		* <li>{@link #getContentDescription()} - The content description of the source.</li>
		* <li>{@link #getGranularity()} - Sets the granularity at which a view's text was traversed.</li>
		* </ul>
		* </p>
		* <p>
		* <b>View scrolled</b> - represents the event of scrolling a view. If
		* the source is a descendant of {@link android.widget.AdapterView} the
		@@ -579,6 +596,11 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		*/
		public static final int TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED = 0x00010000;

		/**
		* Represents the event of traversing the text of a view at a given granularity.
		*/
		public static final int TYPE_VIEW_TEXT_TRAVERSED_AT_GRANULARITY = 0x00020000;

		/**
		* Mask for {@link AccessibilityEvent} all types.
		*
		@@ -597,6 +619,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		* @see #TYPE_VIEW_SCROLLED
		* @see #TYPE_VIEW_TEXT_SELECTION_CHANGED
		* @see #TYPE_ANNOUNCEMENT
		* @see #TYPE_VIEW_TEXT_TRAVERSED_AT_GRANULARITY
		*/
		public static final int TYPES_ALL_MASK = 0xFFFFFFFF;

		@@ -610,6 +633,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		private int mEventType;
		private CharSequence mPackageName;
		private long mEventTime;
		int mGranularity;

		private final ArrayList<AccessibilityRecord> mRecords = new ArrayList<AccessibilityRecord>();

		@@ -627,6 +651,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		void init(AccessibilityEvent event) {
		super.init(event);
		mEventType = event.mEventType;
		mGranularity = event.mGranularity;
		mEventTime = event.mEventTime;
		mPackageName = event.mPackageName;
		}
		@@ -743,6 +768,27 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		mPackageName = packageName;
		}

		/**
		* Sets the text granularity that was traversed.
		*
		* @param granularity The granularity.
		*
		* @throws IllegalStateException If called from an AccessibilityService.
		*/
		public void setGranularity(int granularity) {
		enforceNotSealed();
		mGranularity = granularity;
		}

		/**
		* Gets the text granularity that was traversed.
		*
		* @return The granularity.
		*/
		public int getGranularity() {
		return mGranularity;
		}

		/**
		* Returns a cached instance if such is available or a new one is
		* instantiated with its type property set.
		@@ -831,6 +877,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		protected void clear() {
		super.clear();
		mEventType = 0;
		mGranularity = 0;
		mPackageName = null;
		mEventTime = 0;
		while (!mRecords.isEmpty()) {
		@@ -847,6 +894,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		public void initFromParcel(Parcel parcel) {
		mSealed = (parcel.readInt() == 1);
		mEventType = parcel.readInt();
		mGranularity = parcel.readInt();
		mPackageName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel);
		mEventTime = parcel.readLong();
		mConnectionId = parcel.readInt();
		@@ -897,6 +945,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		public void writeToParcel(Parcel parcel, int flags) {
		parcel.writeInt(isSealed() ? 1 : 0);
		parcel.writeInt(mEventType);
		parcel.writeInt(mGranularity);
		TextUtils.writeToParcel(mPackageName, parcel, 0);
		parcel.writeLong(mEventTime);
		parcel.writeInt(mConnectionId);
		@@ -953,6 +1002,7 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		builder.append("EventType: ").append(eventTypeToString(mEventType));
		builder.append("; EventTime: ").append(mEventTime);
		builder.append("; PackageName: ").append(mPackageName);
		builder.append("; Granularity: ").append(mGranularity);
		builder.append(super.toString());
		if (DEBUG) {
		builder.append("\n");
		@@ -1033,6 +1083,8 @@ public final class AccessibilityEvent extends AccessibilityRecord implements Par
		return "TYPE_VIEW_ACCESSIBILITY_FOCUSED";
		case TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED:
		return "TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED";
		case TYPE_VIEW_TEXT_TRAVERSED_AT_GRANULARITY:
		return "TYPE_CURRENT_AT_GRANULARITY_CHANGED";
		default:
		return null;
		}

core/java/android/view/accessibility/AccessibilityNodeInfo.java

+142 −65

Original line number	Diff line number	Diff line
		@@ -102,7 +102,7 @@ public class AccessibilityNodeInfo implements Parcelable {
		public static final int ACTION_CLEAR_SELECTION = 0x00000008;

		/**
		* Action that clicks on the node info.
		* Action that long clicks on the node info.
		*/
		public static final int ACTION_CLICK = 0x00000010;

		@@ -122,78 +122,105 @@ public class AccessibilityNodeInfo implements Parcelable {
		public static final int ACTION_CLEAR_ACCESSIBILITY_FOCUS = 0x00000080;

		/**
		* Action that requests from the node to go to the next entity in its content
		* at a given granularity. For example, move to the next word, link, etc.
		* <p>
		* <strong>Arguments:</strong>
		* <ul>
		* <li>
		* {@link #ACTION_ARGUMENT_GRANULARITY}
		* </li>
		* <li>
		* </p>
		* Action that requests to go to the next entity in this node's text
		* at a given granularity. For example, move to the next character, word, etc.
		* <p>
		* <strong>Arguments:</strong> {@link #ACTION_ARGUMENT_GRANULARITY_INT}<br>
		* <strong>Example:</strong>
		* <code><pre><p>
		* // Assume the first granularity was presented to the user and she is
		* // making an explicit action to traverse the node at that granularity.
		* CharSequence granularity = info.getGranularity(0);
		* Bundle arguments = new Bundle();
		* arguments.putCharSequence(AccessibilityNodeInfo.ACTION_ARGUMENT_GRANULARITY, granularity);
		* arguments.putInt(AccessibilityNodeInfo.ACTION_ARGUMENT_GRANULARITY_INT,
		* AccessibilityNodeInfo.GRANULARITY_CHARACTER);
		* info.performAction(AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY, arguments);
		* </code></pre></p>
		* </li>
		* </ul>
		* </p>
		* @see #setGranularities(CharSequence[])
		*
		* @see #setGranularities(int)
		* @see #getGranularities()
		*
		* @see #GRANULARITY_CHARACTER
		* @see #GRANULARITY_WORD
		* @see #GRANULARITY_LINE
		* @see #GRANULARITY_PARAGRAPH
		* @see #GRANULARITY_PAGE
		*/
		public static final int ACTION_NEXT_AT_GRANULARITY = 0x00000100;

		/**
		* Action that requests from the node to go to the previous entity in its content
		* at a given granularity. For example, move to the next word, link, etc.
		* <p>
		* <strong>Arguments:</strong>
		* <ul>
		* <li>
		* {@link #ACTION_ARGUMENT_GRANULARITY}
		* </li>
		* <li>
		* </p>
		* Action that requests to go to the previous entity in this node's text
		* at a given granularity. For example, move to the next character, word, etc.
		* <p>
		* <strong>Arguments:</strong> {@link #ACTION_ARGUMENT_GRANULARITY_INT}<br>
		* <strong>Example:</strong>
		* <code><pre><p>
		* // Assume the first granularity was presented to the user and she is
		* // making an explicit action to traverse the node at that granularity.
		* CharSequence granularity = info.getGranularity(0);
		* Bundle arguments = new Bundle();
		* arguments.putCharSequence(AccessibilityNodeInfo.ACTION_ARGUMENT_GRANULARITY, granularity);
		* info.performAction(AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY, arguments);
		* arguments.putInt(AccessibilityNodeInfo.ACTION_ARGUMENT_GRANULARITY_INT,
		* AccessibilityNodeInfo.GRANULARITY_CHARACTER);
		* info.performAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY, arguments);
		* </code></pre></p>
		* </li>
		* </ul>
		* </p>
		* @see #setGranularities(CharSequence[])
		*
		* @see #setGranularities(int)
		* @see #getGranularities()
		*
		* @see #GRANULARITY_CHARACTER
		* @see #GRANULARITY_WORD
		* @see #GRANULARITY_LINE
		* @see #GRANULARITY_PARAGRAPH
		* @see #GRANULARITY_PAGE
		*/
		public static final int ACTION_PREVIOUS_AT_GRANULARITY = 0x00000200;

		/**
		* Argument for which content granularity to be used when traversing the node content.
		* Action to move to the next HTML element of a given type. For example, move
		* to the BUTTON, INPUT, TABLE, etc.
		* <p>
		* <strong>Actions:</strong>
		* <ul>
		* <li>
		* {@link #ACTION_PREVIOUS_AT_GRANULARITY}
		* </li>
		* <li>
		* <strong>Arguments:</strong> {@link #ACTION_ARGUMENT_HTML_ELEMENT_STRING}<br>
		* <strong>Example:</strong>
		* <code><pre><p>
		* Bundle arguments = new Bundle();
		* arguments.putString(AccessibilityNodeInfo.ACTION_ARGUMENT_HTML_ELEMENT_STRING, "BUTTON");
		* info.performAction(AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT, arguments);
		* </code></pre></p>
		* </p>
		*/
		public static final int ACTION_NEXT_HTML_ELEMENT = 0x00000400;

		/**
		* Action to move to the previous HTML element of a given type. For example, move
		* to the BUTTON, INPUT, TABLE, etc.
		* <p>
		* <strong>Arguments:</strong> {@link #ACTION_ARGUMENT_HTML_ELEMENT_STRING}<br>
		* <strong>Example:</strong>
		* <code><pre><p>
		* Bundle arguments = new Bundle();
		* arguments.putString(AccessibilityNodeInfo.ACTION_ARGUMENT_HTML_ELEMENT_STRING, "BUTTON");
		* info.performAction(AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT, arguments);
		* </code></pre></p>
		* </p>
		*/
		public static final int ACTION_PREVIOUS_HTML_ELEMENT = 0x00000800;

		/**
		* Argument for which text granularity to be used when traversing the node text.
		* <p>
		* <strong>Type:</strong> int<br>
		* <strong>Actions:</strong> {@link #ACTION_NEXT_AT_GRANULARITY},
		* {@link #ACTION_PREVIOUS_AT_GRANULARITY}
		* </li>
		* </ul>
		* </p>
		*/
		public static final String ACTION_ARGUMENT_GRANULARITY = "ACTION_ARGUMENT_GRANULARITY";
		public static final String ACTION_ARGUMENT_GRANULARITY_INT = "ACTION_ARGUMENT_GRANULARITY_INT";

		/**
		* Argument for which HTML element to get moving to the next/previous HTML element.
		* <p>
		* <strong>Type:</strong> String<br>
		* <strong>Actions:</strong> {@link #ACTION_NEXT_HTML_ELEMENT},
		* {@link #ACTION_PREVIOUS_HTML_ELEMENT}
		* </p>
		*/
		public static final String ACTION_ARGUMENT_HTML_ELEMENT_STRING =
		"ACTION_ARGUMENT_HTML_ELEMENT_STRING";

		/**
		* The input focus.
		@@ -205,6 +232,33 @@ public class AccessibilityNodeInfo implements Parcelable {
		*/
		public static final int FOCUS_ACCESSIBILITY = 2;

		// Granularities

		/**
		* Granularity bit for traversing the text of a node by character.
		*/
		public static final int GRANULARITY_CHARACTER = 0x00000001;

		/**
		* Granularity bit for traversing the text of a node by word.
		*/
		public static final int GRANULARITY_WORD = 0x00000002;

		/**
		* Granularity bit for traversing the text of a node by line.
		*/
		public static final int GRANULARITY_LINE = 0x00000004;

		/**
		* Granularity bit for traversing the text of a node by paragraph.
		*/
		public static final int GRANULARITY_PARAGRAPH = 0x00000008;

		/**
		* Granularity bit for traversing the text of a node by page.
		*/
		public static final int GRANULARITY_PAGE = 0x00000010;

		// Boolean attributes.

		private static final int PROPERTY_CHECKABLE = 0x00000001;
		@@ -308,7 +362,7 @@ public class AccessibilityNodeInfo implements Parcelable {
		private final SparseLongArray mChildNodeIds = new SparseLongArray();
		private int mActions;

		private CharSequence[] mGranularities;
		private int mGranularities;

		private int mConnectionId = UNDEFINED;

		@@ -532,28 +586,28 @@ public class AccessibilityNodeInfo implements Parcelable {
		}

		/**
		* Sets the granularities for traversing the content of this node.
		* Sets the text granularities for traversing the text of this node.
		* <p>
		* <strong>Note:</strong> Cannot be called from an
		* {@link android.accessibilityservice.AccessibilityService}.
		* This class is made immutable before being delivered to an AccessibilityService.
		* </p>
		*
		* @param granularities The granularity names.
		* @param granularities The bit mask with granularities.
		*
		* @throws IllegalStateException If called from an AccessibilityService.
		*/
		public void setGranularities(CharSequence[] granularities) {
		public void setGranularities(int granularities) {
		enforceNotSealed();
		mGranularities = granularities;
		}

		/**
		* Gets the granularities for traversing the content of this node.
		* Gets the granularities for traversing the text of this node.
		*
		* @return The count.
		* @return The bit mask with granularities.
		*/
		public CharSequence[] getGranularities() {
		public int getGranularities() {
		return mGranularities;
		}

		@@ -1339,8 +1393,6 @@ public class AccessibilityNodeInfo implements Parcelable {
		parcel.writeLong(mParentNodeId);
		parcel.writeInt(mConnectionId);

		parcel.writeCharSequenceArray(mGranularities);

		SparseLongArray childIds = mChildNodeIds;
		final int childIdsSize = childIds.size();
		parcel.writeInt(childIdsSize);
		@@ -1360,6 +1412,8 @@ public class AccessibilityNodeInfo implements Parcelable {

		parcel.writeInt(mActions);

		parcel.writeInt(mGranularities);

		parcel.writeInt(mBooleanProperties);

		parcel.writeCharSequence(mPackageName);
		@@ -1392,7 +1446,7 @@ public class AccessibilityNodeInfo implements Parcelable {
		mContentDescription = other.mContentDescription;
		mActions= other.mActions;
		mBooleanProperties = other.mBooleanProperties;
		mGranularities = (other.mGranularities) != null ? other.mGranularities.clone() : null;
		mGranularities = other.mGranularities;
		final int otherChildIdCount = other.mChildNodeIds.size();
		for (int i = 0; i < otherChildIdCount; i++) {
		mChildNodeIds.put(i, other.mChildNodeIds.valueAt(i));
		@@ -1411,8 +1465,6 @@ public class AccessibilityNodeInfo implements Parcelable {
		mParentNodeId = parcel.readLong();
		mConnectionId = parcel.readInt();

		mGranularities = parcel.readCharSequenceArray();

		SparseLongArray childIds = mChildNodeIds;
		final int childrenSize = parcel.readInt();
		for (int i = 0; i < childrenSize; i++) {
		@@ -1432,6 +1484,8 @@ public class AccessibilityNodeInfo implements Parcelable {

		mActions = parcel.readInt();

		mGranularities = parcel.readInt();

		mBooleanProperties = parcel.readInt();

		mPackageName = parcel.readCharSequence();
		@@ -1449,7 +1503,7 @@ public class AccessibilityNodeInfo implements Parcelable {
		mParentNodeId = ROOT_NODE_ID;
		mWindowId = UNDEFINED;
		mConnectionId = UNDEFINED;
		mGranularities = null;
		mGranularities = 0;
		mChildNodeIds.clear();
		mBoundsInParent.set(0, 0, 0, 0);
		mBoundsInScreen.set(0, 0, 0, 0);
		@@ -1482,6 +1536,29 @@ public class AccessibilityNodeInfo implements Parcelable {
		}
		}

		/**
		* Gets the human readable granularity symbolic name.
		*
		* @param granularity The action.
		* @return The symbolic name.
		*/
		private static String getGranularitySymbolicName(int granularity) {
		switch (granularity) {
		case GRANULARITY_CHARACTER:
		return "GRANULARITY_CHARACTER";
		case GRANULARITY_WORD:
		return "GRANULARITY_WORD";
		case GRANULARITY_LINE:
		return "GRANULARITY_LINE";
		case GRANULARITY_PARAGRAPH:
		return "GRANULARITY_PARAGRAPH";
		case GRANULARITY_PAGE:
		return "GRANULARITY_PAGE";
		default:
		throw new IllegalArgumentException("Unknown granularity: " + granularity);
		}
		}

		private boolean canPerformRequestOverConnection(long accessibilityNodeId) {
		return (mWindowId != UNDEFINED
		&& getAccessibilityViewId(accessibilityNodeId) != UNDEFINED
		@@ -1529,11 +1606,13 @@ public class AccessibilityNodeInfo implements Parcelable {
		builder.append("; virtualDescendantId: " + getVirtualDescendantId(mSourceNodeId));
		builder.append("; mParentNodeId: " + mParentNodeId);

		CharSequence[] granularities = mGranularities;
		int granularities = mGranularities;
		builder.append("; granularities: [");
		for (int i = 0, count = granularities.length; i < count; i++) {
		builder.append(granularities[i]);
		if (i < count - 1) {
		while (granularities != 0) {
		final int granularity = 1 << Integer.numberOfTrailingZeros(granularities);
		granularities &= ~granularity;
		builder.append(getGranularitySymbolicName(granularity));
		if (granularities != 0) {
		builder.append(", ");
		}
		}
		@@ -1570,7 +1649,6 @@ public class AccessibilityNodeInfo implements Parcelable {
		builder.append("; scrollable: " + isScrollable());

		builder.append("; [");

		for (int actionBits = mActions; actionBits != 0;) {
		final int action = 1 << Integer.numberOfTrailingZeros(actionBits);
		actionBits &= ~action;
		@@ -1579,7 +1657,6 @@ public class AccessibilityNodeInfo implements Parcelable {
		builder.append(", ");
		}
		}

		builder.append("]");

		return builder.toString();

services/java/com/android/server/accessibility/AccessibilityManagerService.java

+38 −4

Original line number	Diff line number	Diff line
		@@ -1554,7 +1554,7 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
		IAccessibilityInteractionConnection connection = null;
		synchronized (mLock) {
		final boolean permissionGranted = mSecurityPolicy.canPerformActionLocked(this,
		resolvedWindowId, action);
		resolvedWindowId, action, arguments);
		if (!permissionGranted) {
		return false;
		} else {
		@@ -1702,7 +1702,16 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
		\| AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS
		\| AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS
		\| AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY
		\| AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY;
		\| AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY
		\| AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT
		\| AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT;

		private static final int VALID_GRANULARITIES =
		AccessibilityNodeInfo.GRANULARITY_CHARACTER
		\| AccessibilityNodeInfo.GRANULARITY_WORD
		\| AccessibilityNodeInfo.GRANULARITY_LINE
		\| AccessibilityNodeInfo.GRANULARITY_PARAGRAPH
		\| AccessibilityNodeInfo.GRANULARITY_PAGE;

		private static final int RETRIEVAL_ALLOWING_EVENT_TYPES =
		AccessibilityEvent.TYPE_VIEW_CLICKED
		@@ -1752,10 +1761,12 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
		return canRetrieveWindowContent(service) && isRetrievalAllowingWindow(windowId);
		}

		public boolean canPerformActionLocked(Service service, int windowId, int action) {
		public boolean canPerformActionLocked(Service service, int windowId, int action,
		Bundle arguments) {
		return canRetrieveWindowContent(service)
		&& isRetrievalAllowingWindow(windowId)
		&& isActionPermitted(action);
		&& isActionPermitted(action)
		&& isActionArgumentsValid(action, arguments);
		}

		public boolean canRetrieveWindowContent(Service service) {
		@@ -1779,6 +1790,29 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
		return (VALID_ACTIONS & action) != 0;
		}

		private boolean isActionArgumentsValid(int action, Bundle arguments) {
		switch (action) {
		case AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY:
		case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY: {
		if (arguments.size() == 1) {
		final int granularity = arguments.getInt(
		AccessibilityNodeInfo.ACTION_ARGUMENT_GRANULARITY_INT);
		return (granularity & VALID_GRANULARITIES) != 0
		&& Integer.bitCount(granularity) == 1;
		}
		} break;
		case AccessibilityNodeInfo.ACTION_NEXT_HTML_ELEMENT:
		case AccessibilityNodeInfo.ACTION_PREVIOUS_HTML_ELEMENT: {
		if (arguments.size() == 1) {
		String element = arguments.getString(
		AccessibilityNodeInfo.ACTION_ARGUMENT_HTML_ELEMENT_STRING);
		return !TextUtils.isEmpty(element);
		}
		} break;
		}
		return false;
		}

		private void enforceCallingPermission(String permission, String function) {
		if (OWN_PROCESS_ID == Binder.getCallingPid()) {
		return;