How to know if Android TalkBack is active?

问题

I'm developing an application that uses TalkBack to guide people through it. However, in those situations I want to have some subtile differences in the layout of the application so navigation is easier and also have extra voice outputs (with TextToSpeech) to help guide the user.

My problem is that I only want those changes and extra outputs if the user has TalkBack active.

Is there any way to know if it is? I didn't find anything specific to access TalkBack settings directly, but I was hoping there was some form of accessing general phone settings that could let me know what I need.

Regards and thanks in advance.

回答1:

For an example, look at isScreenReaderActive() in HomeLauncher.java file in the Eyes-Free shell application (via groups thread).

To sum up: you detect all screen readers with Intents, then query the status provider of each to see if it is active.

If you really want to limit it to TalkBack only, you could try checking the ResolveInfo.serviceInfo.packageName for each result returned from queryIntentServices() to see if it matches the TalkBack package.

回答2:

The recommended way of doing this is to query the AccessibilityManager for the enabled state of accessibility services.

AccessibilityManager am = (AccessibilityManager) getSystemService(ACCESSIBILITY_SERVICE);
boolean isAccessibilityEnabled = am.isEnabled();
boolean isExploreByTouchEnabled = am.isTouchExplorationEnabled();

回答3:

Novoda have released a library called accessibilitools which does this check. It queries the accessibility manager to check if there are any accessibility services enabled that support the "spoken feedback" flag.

AccessibilityServices services = AccessibilityServices.newInstance(context);
services.isSpokenFeedbackEnabled();

回答4:

For me, I solved this problem in this way , it works well in my project:

use getEnabledAccessibilityServiceList() to get all Accessibility service, a service whose status is open will be in this list
Talkback contain a activity named com.android.talkback.TalkBackPreferencesActivity, you can traversing the list to find whether the talkback service is open

The detailed code below：

    private static final String TALKBACK_SETTING_ACTIVITY_NAME = "com.android.talkback.TalkBackPreferencesActivity";

    public static boolean accessibilityEnable(Context context) {
        boolean enable = false;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            try {
                AccessibilityManager manager = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
                List<AccessibilityServiceInfo> serviceList = manager.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_SPOKEN);
                for (AccessibilityServiceInfo serviceInfo : serviceList) {
                    String name = serviceInfo.getSettingsActivityName();
                    if (!TextUtils.isEmpty(name) && name.equals(TALKBACK_SETTING_ACTIVITY_NAME)) {
                        enable = true;
                    }
                }
            } catch (Exception e) {
                if (Logging.isDebugLogging()) {
                    e.printStackTrace();
                }
            }
        }
        return enable;
}

回答5:

    AccessibilityManager am = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
    if (am != null && am.isEnabled()) {
        List<AccessibilityServiceInfo> serviceInfoList = am.getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_SPOKEN);
        if (!serviceInfoList.isEmpty())
            return true;
    }
    return false;

回答6:

Open system setting and go to accessibility and tap to off Talk back option

来源：https://stackoverflow.com/questions/5116867/how-to-know-if-android-talkback-is-active

标签

android

accessibility

talkback

android-accessibility