我已打开辅助功能,当我四处导航时,我的设备会说话。
我有一个习惯seekbar
并已实施以下措施:
onTouchEvent
摘抄:
...
case MotionEvent.ACTION_MOVE:
getParent().requestDisallowInterceptTouchEvent(true);
setTouchAngle(pointToAngle(touchX, touchY));
score = getScoreFromAngle(angleStart,touchAngle);
if (onScoreSetListener != null) {
onScoreSetListener.onScorePoll(this, score);
sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED);
}
break;
...
onPopulateAccessibilityEvent
method:
@Override
public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(event);
LogUtils.i(TAG,"onPopulateAccessibilityEvent()",null);
switch (event.getEventType()) {
case AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED:
LogUtils.d(TAG,"dispatchPopulateAccessibilityEvent() TYPE_VIEW_TEXT_CHANGED",null);
event.getText().add(String.valueOf(getScore()));
break;
}
}
我可以看到onPopulateAccessibilityEvent
被叫进来LogCat
成功,但设备没有给出任何反馈。我预计当前的分数会被读回,但什么也没有。
有人有任何见解吗?
如果你要延长ProgressBar
,您可以设置传出的文本TYPE_VIEW_SELECTED
事件。当用户调整搜索栏时,这些信息会自动发送。
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.getText().add(...);
}
然而,看起来你可能已经延长了View
。在这种情况下,您需要使用一个简单的解决方法,并通过发送VIEW_FOCUSED
ICS 上的事件,或使用announceForAccessibility
JellyBean 及以上版本的 API。这需要 support-v4 库,如下所示:
/** The parent context. Used to obtain string resources. */
private final Context mContext;
/**
* The accessibility manager for this context. This is used to check the
* accessibility enabled state, as well as to send raw accessibility events.
*/
private final AccessibilityManager mA11yManager;
/**
* Generates and dispatches an SDK-specific spoken announcement.
* <p>
* For backwards compatibility, we're constructing an event from scratch
* using the appropriate event type. If your application only targets SDK
* 16+, you can just call View.announceForAccessibility(CharSequence).
* </p>
*
* @param text The text to announce.
*/
private void announceForAccessibilityCompat(CharSequence text) {
if (!mA11yManager.isEnabled()) {
return;
}
// Prior to SDK 16, announcements could only be made through FOCUSED
// events. Jelly Bean (SDK 16) added support for speaking text verbatim
// using the ANNOUNCEMENT event type.
final int eventType;
if (Build.VERSION.SDK_INT < 16) {
eventType = AccessibilityEvent.TYPE_VIEW_FOCUSED;
} else {
eventType = AccessibilityEventCompat.TYPE_ANNOUNCEMENT;
}
// Construct an accessibility event with the minimum recommended
// attributes. An event without a class name or package may be dropped.
final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
event.getText().add(text);
event.setEnabled(isEnabled());
event.setClassName(getClass().getName());
event.setPackageName(mContext.getPackageName());
// JellyBean MR1 requires a source view to set the window ID.
final AccessibilityRecordCompat record = new AccessibilityRecordCompat(event);
record.setSource(this);
// Sends the event directly through the accessibility manager. If your
// application only targets SDK 14+, you should just call
// getParent().requestSendAccessibilityEvent(this, event);
mA11yManager.sendAccessibilityEvent(event);
}
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