android.view.accessibility.AccessibilityEvent Java Examples

@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    // Dispatch scroll events from this ViewPager.
    if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED) {
        return super.dispatchPopulateAccessibilityEvent(event);
    }

    // Dispatch all other accessibility events from the current page.
    final int childCount = getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = getChildAt(i);
        if (child.getVisibility() == VISIBLE) {
            final ItemInfo ii = infoForChild(child);
            if (ii != null && ii.position == mCurItem &&
                    child.dispatchPopulateAccessibilityEvent(event)) {
                return true;
            }
        }
    }

    return false;
}
 

private int getClickType(AccessibilityEvent event) {
    int type = event.getEventType();
    long time = event.getEventTime();
    long id = getSourceNodeId(event);
    if (type != TYPE_VIEW_CLICKED) {
        mLastClickTime = time;
        mLastSourceNodeId = -1;
        return type;
    }
    if (id == -1) {
        mLastClickTime = time;
        mLastSourceNodeId = -1;
        return type;
    }
    if (type == TYPE_VIEW_CLICKED && time - mLastClickTime <= double_click_interval && id == mLastSourceNodeId) {
        mLastClickTime = -1;
        mLastSourceNodeId = -1;
        return TYPE_VIEW_DOUBLD_CLICKED;
    } else {
        mLastClickTime = time;
        mLastSourceNodeId = id;
        return type;
    }
}
 

@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    // Dispatch scroll events from this ViewPager.
    if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED) {
        return super.dispatchPopulateAccessibilityEvent(event);
    }

    // Dispatch all other accessibility events from the current page.
    final int childCount = getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = getChildAt(i);
        if (child.getVisibility() == VISIBLE) {
            final ItemInfo ii = infoForChild(child);
            if (ii != null && ii.position == mCurItem &&
                    child.dispatchPopulateAccessibilityEvent(event)) {
                return true;
            }
        }
    }

    return false;
}
 

/**
 * Constructs and returns an {@link AccessibilityEvent} populated with
 * information about the specified item.
 *
 * @param virtualViewId The virtual view id for the item for which to
 *            construct an event.
 * @param eventType The type of event to construct.
 * @return An {@link AccessibilityEvent} populated with information about
 *         the specified item.
 */
private AccessibilityEvent getEventForVirtualViewId(int virtualViewId, int eventType) {
    final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);

    // Ensure the client has good defaults.
    event.setEnabled(true);
    event.setClassName(mHost.getClass().getName() + DEFAULT_CLASS_NAME);

    // Allow the client to populate the event.
    populateEventForVirtualViewId(virtualViewId, event);

    if (event.getText().isEmpty() && TextUtils.isEmpty(event.getContentDescription())) {
        throw new RuntimeException(
                "You must add text or a content description in populateEventForItem()");
    }

    // Don't allow the client to override these properties.
    event.setPackageName(mHost.getContext().getPackageName());

    // Virtual view hierarchies are only supported in API 16+.
    final AccessibilityRecordCompat record = new AccessibilityRecordCompat(event);
    record.setSource(mHost, virtualViewId);

    return event;
}
 

void selectionChanged() {
    if (mOnItemSelectedListener != null) {
        if (mInLayout || mBlockLayoutRequests) {
            // If we are in a layout traversal, defer notification
            // by posting. This ensures that the view tree is
            // in a consistent state and is able to accomodate
            // new layout or invalidate requests.
            if (mSelectionNotifier == null) {
                mSelectionNotifier = new SelectionNotifier();
            }
            post(mSelectionNotifier);
        } else {
            fireOnSelected();
        }
    }

    // we fire selection events here not in View
    if (mSelectedPosition != ListView.INVALID_POSITION && isShown() && !isInTouchMode()) {
        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
    }
}
 

private void updateAmPmControl() {
    if (is24HourView()) {
        if (mAmPmSpinner != null) {
            mAmPmSpinner.setVisibility(View.GONE);
        } else {
            mAmPmButton.setVisibility(View.GONE);
        }
    } else {
        int index = mIsAm ? Calendar.AM : Calendar.PM;
        if (mAmPmSpinner != null) {
            mAmPmSpinner.setValue(index);
            mAmPmSpinner.setVisibility(View.VISIBLE);
        } else {
            mAmPmButton.setText(mAmPmStrings[index]);
            mAmPmButton.setVisibility(View.VISIBLE);
        }
    }
    mDelegator.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
}
 

/**
 * set text into input text at USSD widget
 *
 * @param event AccessibilityEvent
 * @param data  Any String
 */
private static void setTextIntoField(AccessibilityEvent event, String data) {
    USSDController ussdController = USSDController.instance;
    Bundle arguments = new Bundle();
    arguments.putCharSequence(
            AccessibilityNodeInfo.ACTION_ARGUMENT_SET_TEXT_CHARSEQUENCE, data);

    for (AccessibilityNodeInfo leaf : getLeaves(event)) {
        if (leaf.getClassName().equals("android.widget.EditText")
                && !leaf.performAction(AccessibilityNodeInfo.ACTION_SET_TEXT, arguments)) {
            ClipboardManager clipboardManager = ((ClipboardManager) ussdController.context
                    .getSystemService(Context.CLIPBOARD_SERVICE));
            if (clipboardManager != null) {
                clipboardManager.setPrimaryClip(ClipData.newPlainText("text", data));
            }

            leaf.performAction(AccessibilityNodeInfo.ACTION_PASTE);
        }
    }
}
 

@Override
public void onAccessibilityEvent(AccessibilityEvent event) {
    switch (event.getEventType()) {
        case AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED:
            Parcelable parcelable = event.getParcelableData();
            if (parcelable instanceof Notification) {
                if (Device.hasJellyBeanMR2Api()) {
                    // No need to use the accessibility service
                    // instead of NotificationListener.
                    return;
                }

                Notification notification = (Notification) parcelable;
                OpenNotification openNotification = OpenNotification.newInstance(notification);
                NotificationPresenter.getInstance().postNotificationFromMain(this, openNotification, 0);
            }
            break;
    }
}
 

@Override
public void setSelected(final boolean selected) {
  final boolean changed = isSelected() != selected;

  super.setSelected(selected);

  if (changed && selected && Build.VERSION.SDK_INT < 16) {
    // Pre-JB we need to manually send the TYPE_VIEW_SELECTED event
    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
  }

  // Always dispatch this to the child views, regardless of whether the value has
  // changed
  if (textView != null) {
    textView.setSelected(selected);
  }
  if (iconView != null) {
    iconView.setSelected(selected);
  }
  if (customView != null) {
    customView.setSelected(selected);
  }
}
 

@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    // ViewPagers should only report accessibility info for the current page,
    // otherwise things get very confusing.

    // TODO: Should this note something about the paging container?

    final int childCount = getChildCount();
    for (int i = 0; i < childCount; i++) {
        final View child = getChildAt(i);
        if (child.getVisibility() == VISIBLE) {
            final ItemInfo ii = infoForChild(child);
            if (ii != null && ii.position == mCurItem &&
                    child.dispatchPopulateAccessibilityEvent(event)) {
                return true;
            }
        }
    }

    return false;
}
 

private void updateAmPmControl() {
    if (is24Hour()) {
        if (mAmPmSpinner != null) {
            mAmPmSpinner.setVisibility(View.GONE);
        } else {
            mAmPmButton.setVisibility(View.GONE);
        }
    } else {
        int index = mIsAm ? Calendar.AM : Calendar.PM;
        if (mAmPmSpinner != null) {
            mAmPmSpinner.setValue(index);
            mAmPmSpinner.setVisibility(View.VISIBLE);
        } else {
            mAmPmButton.setText(mAmPmStrings[index]);
            mAmPmButton.setVisibility(View.VISIBLE);
        }
    }
    mDelegator.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
}
 

private void scheduleAnnouncement(AccessibilityEvent event, EventId eventId) {
  // Scrolling a ViewPager2 also scrolls its tabs. Suppress the tab scroll announcement if the
  // scheduled announcement originates from a page scroll, so the page position announcement isn't
  // stopped. There's only a small possibility that this suppressed event comes from an unrelated
  // HorizontalScrollView within the 500ms time frame.
  if (Role.getSourceRole(eventToAnnounce) == Role.ROLE_PAGER) {
    if (Role.getSourceRole(event) == Role.ROLE_HORIZONTAL_SCROLL_VIEW) {
      return;
    }
  }
  clearCachedEvent();
  eventToAnnounce = AccessibilityEvent.obtain(event);
  this.eventId = eventId;

  delayHandler.removeMessages();
  delayHandler.delay(
      (Role.getSourceRole(event) == Role.ROLE_PAGER)
          ? DELAY_PAGE_FEEDBACK
          : DELAY_SCROLL_FEEDBACK,
      null);
}
 

void selectionChanged() {
    if (mOnItemSelectedListener != null) {
        if (mInLayout || mBlockLayoutRequests) {
            // If we are in a layout traversal, defer notification
            // by posting. This ensures that the view tree is
            // in a consistent state and is able to accomodate
            // new layout or invalidate requests.
            if (mSelectionNotifier == null) {
                mSelectionNotifier = new SelectionNotifier();
            }
            post(mSelectionNotifier);
        } else {
            fireOnSelected();
        }
    }

    // we fire selection events here not in View
    if (mSelectedPosition != ListView.INVALID_POSITION && isShown() && !isInTouchMode()) {
        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
    }
}
 

/**
 * Called when the user clicks on a day. Handles callbacks to the
 * {@link OnDayClickListener} if one is set.
 *
 * @param day the day that was clicked
 */
private boolean onDayClicked(int day) {
    if (!isValidDayOfMonth(day) || !isDayEnabled(day)) {
        return false;
    }

    if (mOnDayClickListener != null) {
        final Calendar date = Calendar.getInstance();
        date.set(mYear, mMonth, day);

        mOnDayClickListener.onDayClick(this, date);
    }

    // This is a no-op if accessibility is turned off.
    mTouchHelper.sendEventForVirtualView(day, AccessibilityEvent.TYPE_VIEW_CLICKED);
    return true;
}
 

@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(host, event);
    event.setClassName(RecyclerView.class.getName());
    if (host instanceof RecyclerView) {
        RecyclerView rv = (RecyclerView) host;
        if (rv.getLayoutManager() != null) {
            rv.getLayoutManager().onInitializeAccessibilityEvent(event);
        }
    }
}
 

private AccessibilityNodeInfoCompat getNodeFromEvent(
        AccessibilityEvent event) {
    AccessibilityNodeInfo node = event.getSource();
    if (node != null) {
        return new AccessibilityNodeInfoCompat(node);
    } else {
        return null;
    }
}
 

@Override
public boolean performAction(int virtualViewId, int action, Bundle arguments) {
    if (virtualViewId == View.NO_ID) {
        return ViewCompat.performAccessibilityAction(mParentView, action, arguments);
    }

    final T item = getItemForId(virtualViewId);
    if (item == null) {
        return false;
    }

    boolean handled = false;

    switch (action) {
        case AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS:
            if (mFocusedItemId != virtualViewId) {
                mFocusedItemId = virtualViewId;
                sendEventForItem(item, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
                handled = true;
            }
            break;
        case AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS:
            if (mFocusedItemId == virtualViewId) {
                mFocusedItemId = INVALID_ID;
                sendEventForItem(item, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
                handled = true;
            }
            break;
    }

    handled |= performActionForItem(item, action, arguments);

    return handled;
}
 

/**
 * Whether a scroll event should not be sent to the Compositor.
 *
 * <p>TODO: Consider adding a flag to ScrollEventInterpretation for not playing
 * earcons if dropping the events here causes issues or if more flexibility is needed.
 */
private boolean shouldDropScrollEvent(AccessibilityEvent event, long currentTimeInMillis) {
  // Dropping events may cause weird rhythms when scrolling, e.g. if we're getting an event every
  // 300ms and we reject at the 250ms mark.
  return lastScrollEventWasRecent(currentTimeInMillis)
      || isAutomaticMediaScrollEvent()
      || !isValidScrollEvent(event);
}
 

public void onNotificationChanged(AccessibilityEvent event) {
    List<CharSequence> texts = event.getText();
    if (texts.isEmpty())
        return;
    for (CharSequence text : texts) {
        String string = text + "";
        Log.w(TAG, "Notification text: " + string);
        if (string.equals("你的帐号在电脑登录"))
            return;

        StringBuilder builder = new StringBuilder(string);
        int i1 = string.indexOf("[特别关注]");
        int i2 = string.indexOf("[有新回复]");
        if (i1 != -1 && i1 + 6 < string.length())
            builder.delete(i1, i1 + 6);
        if (i2 != -1 && i2 + 6 < string.length())
            builder.delete(i2, i2 + 6);
        string = builder.toString();

        int i = string.indexOf(':');
        if (i < 1) {
            Log.d(TAG, "Notification does not contains ':'");
            return;
        }
        title = string.substring(0, i);
        message = string.substring(i + 2);
        subName = title;
        //是群消息
        int j = title.indexOf('(');
        if (j > 0 && title.charAt(i - 1) == ')') {
            message = string.substring(i + 1);
            subName = title.substring(0, j);
            title = title.substring(j + 1, i - 1);
        }

        addMsg(true);
    }
}
 

public static boolean isFromVolumeControlPanel(AccessibilityEvent event) {
  // Volume slider case.
  // TODO: Find better way to handle volume slider.
  CharSequence sourceClassName = event.getClassName();
  boolean isVolumeInAndroidP =
      BuildVersionUtils.isAtLeastP()
          && TextUtils.equals(sourceClassName, VOLUME_CONTROLS_CLASS_IN_ANDROID_P);
  boolean isVolumeInAndroidO =
      BuildVersionUtils.isAtLeastO()
          && (!BuildVersionUtils.isAtLeastP())
          && TextUtils.equals(sourceClassName, DIALOG_CLASS_NAME);
  return isVolumeInAndroidO || isVolumeInAndroidP;
}
 

@Override
public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child,
        AccessibilityEvent event) {
    if (!filter(child)) {
        return super.onRequestSendAccessibilityEvent(host, child, event);
    }
    return false;
}
 

@Override
public boolean requestSendAccessibilityEvent(
        ViewParent parent, View child, AccessibilityEvent event) {
    // Emulate what ViewRootImpl does in ICS and above.
    if (child == null) {
        return false;
    }
    final AccessibilityManager manager = (AccessibilityManager) child.getContext()
            .getSystemService(Context.ACCESSIBILITY_SERVICE);
    manager.sendAccessibilityEvent(event);
    return true;
}
 

/**
 * Processes an <code>event</code> by asking the {@link Compositor} to match it against its rules
 * and in case an utterance is generated it is spoken. This method is responsible for recycling of
 * the processed event.
 *
 * @param event The event to process.
 */
private void processAndRecycleEvent(AccessibilityEvent event, EventId eventId) {
  if (event == null) {
    return;
  }
  LogUtils.d(TAG, "Processing event: %s", event);

  eventFilter.sendEvent(event, eventId);

  event.recycle();
}
 

VariableDelegate createLocalVariableDelegate(
    @Nullable AccessibilityEvent event,
    @Nullable AccessibilityNodeInfoCompat node,
    @Nullable EventInterpretation interpretation) {
  VariableDelegate delegate = mGlobalVariables;
  if (event != null) {
    delegate =
        new EventVariables(mContext, delegate, event, event.getSource(), mUserPreferredLocale);
  }

  if (interpretation != null) {
    delegate =
        new InterpretationVariables(mContext, delegate, interpretation, mUserPreferredLocale);
  }

  // Node variables is constructed last. This ensures that child nodes it creates have access to
  // top level global variables.
  if (node != null) {
    delegate =
        new NodeVariables(
            mContext,
            mLabelManager,
            nodeMenuProvider,
            delegate,
            AccessibilityNodeInfoCompat.obtain(node),
            mUserPreferredLocale);
  }
  return delegate;
}
 

@Override
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        super.onPopulateAccessibilityEvent(event);
    }
    final CharSequence cdesc = getContentDescription();
    if (!TextUtils.isEmpty(cdesc)) {
        event.getText().add(cdesc);
    }
}
 

@Override
public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(host, event);
    event.setClassName(ViewPager.class.getName());
    final AccessibilityRecordCompat recordCompat = AccessibilityRecordCompat.obtain();
    recordCompat.setScrollable(canScroll());
    if (event.getEventType() == AccessibilityEventCompat.TYPE_VIEW_SCROLLED
            && mAdapter != null) {
        recordCompat.setItemCount(mAdapter.getCount());
        recordCompat.setFromIndex(mCurItem);
        recordCompat.setToIndex(mCurItem);
    }
}
 

/**
 * Opens the drawer immediately.
 *
 * @see #toggle()
 * @see #close()
 * @see #animateOpen()
 */
public void open() {
    openDrawer();
    invalidate();
    requestLayout();

    sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
}
 

void dispatchOnDrawerClosed(View drawerView) {
    final LayoutParams lp = (LayoutParams) drawerView.getLayoutParams();
    if (lp.knownOpen) {
        lp.knownOpen = false;
        if (mListener != null) {
            mListener.onDrawerClosed(drawerView);
        }
        sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    }
}
 

@Override
public boolean handleMessage(Message msg) {
    switch(msg.what) {
        case MSG_VIEW_SCROLLED:
            mMsgViewScrolledQueued = false;
            mEventSender.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED);
            break;
        default:
            throw new IllegalStateException(
                    "AccessibilityInjector: unhandled message: " + msg.what);
    }
    return true;
}
 

@Override
public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
    if (super.onRequestSendAccessibilityEvent(child, event)) {
        // Add a record for ourselves as well.
        AccessibilityEvent record = AccessibilityEvent.obtain();
        onInitializeAccessibilityEvent(record);
        // Populate with the text of the requesting child.
        child.dispatchPopulateAccessibilityEvent(record);
        event.appendRecord(record);
        return true;
    }
    return false;
}