private static void populateEventFromJSON(AccessibilityEvent event, JSONObject message) {
final JSONArray textArray = message.optJSONArray("text");
if (textArray != null) {
for (int i = 0; i < textArray.length(); i++) event.getText().add(textArray.optString(i));
}
event.setContentDescription(message.optString("description"));
event.setEnabled(message.optBoolean("enabled", true));
event.setChecked(message.optBoolean("checked"));
event.setPassword(message.optBoolean("password"));
event.setAddedCount(message.optInt("addedCount", -1));
event.setRemovedCount(message.optInt("removedCount", -1));
event.setFromIndex(message.optInt("fromIndex", -1));
event.setItemCount(message.optInt("itemCount", -1));
event.setCurrentItemIndex(message.optInt("currentItemIndex", -1));
event.setBeforeText(message.optString("beforeText"));
if (Versions.feature14Plus) {
event.setToIndex(message.optInt("toIndex", -1));
event.setScrollable(message.optBoolean("scrollable"));
event.setScrollX(message.optInt("scrollX", -1));
event.setScrollY(message.optInt("scrollY", -1));
}
if (Versions.feature15Plus) {
event.setMaxScrollX(message.optInt("maxScrollX", -1));
event.setMaxScrollY(message.optInt("maxScrollY", -1));
}
}
@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
boolean populated = false;
// This is an exceptional case which occurs when a window gets the
// focus and sends a focus event via its focused child to announce
// current focus/selection. CarouselAdapter fires selection but not focus
// events so we change the event type here.
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {
event.setEventType(AccessibilityEvent.TYPE_VIEW_SELECTED);
}
// we send selection events only from CarouselAdapter to avoid
// generation of such event for each child
View selectedView = getSelectedView();
if (selectedView != null) {
populated = selectedView.dispatchPopulateAccessibilityEvent(event);
}
if (!populated) {
if (selectedView != null) {
event.setEnabled(selectedView.isEnabled());
}
event.setItemCount(getCount());
event.setCurrentItemIndex(getSelectedItemPosition());
}
return populated;
}
// BEGIN_INCLUDE (on_populate_accessibility_event)
@Override
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(event);
// Detect what type of accessibility event is being passed in.
int eventType = event.getEventType();
// Common case: The user has interacted with our view in some way. State may or may not
// have been changed. Read out the current status of the view.
//
// We also set some other metadata which is not used by TalkBack, but could be used by
// other TTS engines.
if (eventType == AccessibilityEvent.TYPE_VIEW_SELECTED
|| eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
event.getText().add("Mode selected: " + Integer.toString(mActiveSelection + 1) + ".");
event.setItemCount(SELECTION_COUNT);
event.setCurrentItemIndex(mActiveSelection);
}
// When a user first focuses on our view, we'll also read out some simple instructions to
// make it clear that this is an interactive element.
if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
event.getText().add("Tap to change.");
}
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setScrollable(isScrollableForAccessibility());
View selectedView = getSelectedView();
if (selectedView != null) {
event.setEnabled(selectedView.isEnabled());
}
event.setCurrentItemIndex(getSelectedItemPosition());
event.setFromIndex(getFirstVisiblePosition());
event.setToIndex(getLastVisiblePosition());
event.setItemCount(getCount());
}