发送未链接到浏览辅助活动 [英] Send accessibility event not linked to view

问题描述

我们正在寻找发送访问事件（这将拾起话语提示等）未链接到一个视图。

We're looking to send an accessibility event (which would be picked up by TalkBack etc.) which isn't linked to a view.

例如，我怎么能发送一个访问事件（如对讲系统说数据下载），当一个AsyncTask的完成？

For example, how could I send an accessibility event (e.g. talkback saying "Data downloaded") when a AsyncTask has finished?

推荐答案

它看起来像对讲当前版本忽略的公告，如果AccessibilityEvent.getSource（）返回null，所以你最好使用吐司。这有提供一致的反馈给用户是否他们正在使用话语提示的附加好处。

It looks like the current version of TalkBack ignores announcements if AccessibilityEvent.getSource() returns null, so you're best off using a Toast. This had the added benefit of providing consistent feedback to users whether or not they are using TalkBack.

Toast.makeText(context, /** some text */, Toast.LENGTH_SHORT).show();

通常情况下，虽然，你可以手动创建一个AccessibilityEvent并通过AccessibilityManager发送。

Normally, though, you could manually create an AccessibilityEvent and send it through the AccessibilityManager.

AccessibilityManager manager = (AccessibilityManager) context
        .getSystemService(Context.ACCESSIBILITY_SERVICE);
if (manager.isEnabled()) {
    AccessibilityEvent e = AccessibilityEvent.obtain();
    e.setEventType(AccessibilityEvent.TYPE_ANNOUNCEMENT);
    e.setClassName(getClass().getName());
    e.setPackageName(context.getPackageName());
    e.getText().add("some text");
    manager.sendAccessibilityEvent(e);
}

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