[Android]：触发AccessibilityEvent时，TalkBack不讲话 [英] [Android]: TalkBack doesn't speak when AccessibilityEvent is triggered

问题描述

我正在创建一个自定义视图（扩展View类），并使用Accessibility API来了解其工作原理。
下面是我的代码，其中：

I'm creating a custom view (extending View class) and playing with Accessibility API to understand, how it works. Below is my code, where:

1. 我检查了 MotionEvent 等于 ACTION_HOVER_ENTER ，然后在其中发送 TYPE_VIEW_HOVER_ENTER 类型的AccessibilityEvent。


2. 我在 onPopulateAccessibilityEvent 中捕获了我的 AccessibilityEvent 。然后，我将自定义文本添加到活动文本中，只需添加即可。



1. I check for MotionEvent equal to ACTION_HOVER_ENTER and then inside it send AccessibilityEvent of type TYPE_VIEW_HOVER_ENTER.
2. I'm catching my AccessibilityEvent in onPopulateAccessibilityEvent. Then I'm adding my custom text into event's text, which is added just fine.

结果是，当我将鼠标悬停在我的视图上时，一切都很好（由我的日志确认），但是TalkBack却没有说我的自定义文字。我可以使话语提示说出自定义文本的唯一方法是使用 setContentDescription（自定义文本...）。

As a result, when I hover over my view, all is working fine (confirmed by my logs), but TalkBack doesn't say my custom text. The only way I was able to make TalkBack to say custom text is to use setContentDescription("custom text...").

但是，据我理解API的方式，应该可以根据 MotionEvent 以及相应的 AccessibilityType 类型。

But, the way I understand the API, it should be possible to set different text depending on the type of MotionEvent and correspondingly a type of AccessibilityType.

我的问题-有人可以向我解释一下，我怎么做话语提示说出我的自定义文字，我可以根据事件类型设置该文字吗？

My question - can someone explain to me please, how can I make TalkBack to speak my custom text, which I can set depending on type of event?

@Override
    public boolean onHoverEvent(MotionEvent event) {
        final int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_HOVER_ENTER:
                Log.d("test", "onHoverEvent: ACTION_HOVER_ENTER"); // <-- this is triggered correctly on hover enter
                sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER);
                return true;
        }
        return super.onHoverEvent(event);
    }

    @Override
    public void onPopulateAccessibilityEvent(AccessibilityEvent event) {
        super.onPopulateAccessibilityEvent(event);
        if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_HOVER_ENTER) {
            Log.d("test", "onPopulateAccessibilityEvent");
            CharSequence text = "this is a test";
            Log.d("test", "text before: " + event.getText()); // text before is empty, i.e. "[]"
            event.getText().add(text);
            Log.d("test", "text after: " + event.getText()); // text after is "[this is a test]", but TalkBack is silent
        }
    }

推荐答案

请参考此答案

您可以尝试通过以下方式启用/禁用辅助功能设置。

You may try to enable/disable accessibility setting in following way.

Settings.Secure.putString(getContentResolver(), 
    Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, "pkgname/classname");
Settings.Secure.putString(getContentResolver(), 
    Settings.Secure.ACCESSIBILITY_ENABLED, "1");

其中pkgname是您的包名称，classname是您的可访问性服务的类名称。

Where the pkgname is your package name and the classname is the class name of your accessibility service.

如果您需要启用多个服务，或者不想破坏以前的设置，则可以使用：分隔其他服务。

If you need to enable several services or you don't want to destory the previous settings you might want to use : to seperate other services.

另外，您可能需要作为系统应用程序运行，并且可能需要以下权限

Also you might need to run as a system application and you might need the following permissions

<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />

这可能不适用于某些版本的Android。

this might not work on some versions of Android.

另请参考其他答案此问题

PS。如果它不起作用，也许您可​​以在/data/data/com.android.providers.settings/databases/settings.db/secure中找到运气，这就是Android存储安全设置的地方。

PS. If it doesn't work, maybe you could find some luck in /data/data/com.android.providers.settings/databases/settings.db/secure, that's where Android stores secure settings.

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