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POWhen using TalkBack, what is the preferred way to alert the user when the contents of a TextView have changed?
 

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  1. POWhen using TalkBack, what is the preferred way to alert the user when the contents of a TextView have changed?
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    <p>I have an unlock screen where the user is prompted to enter a four digit pin. If the user enters their pin incorrectly, a previously invisible <code>TextView</code> is shown with an error message. At this point it would be useful for TalkBack to read the contents of the error message out loud.</p> <p>Through some experimentation, I realized I could set <code>android:focusableInTouchMode="true"</code> on the view and programmatically call <a href="http://developer.android.com/reference/android/view/View.html#requestFocus%28%29"><code>View#requestFocus()</code></a>. This works the first time, but fails on subsequent errors since the view already has focus. Also it seems like a bad idea in general to override the current view focus.</p> <p>I then tried invoking <a href="http://developer.android.com/reference/android/view/View.html#announceForAccessibility%28java.lang.CharSequence%29"><code>View#announceForAccessibility(java.lang.CharSequence)</code></a> when the error message is displayed. Apparently this method will <em>silently fail</em> if the view is not currently visible. No problem and otherwise it works perfectly. However, it's only available in API level 16+ (Jelly Bean) which really limits it's usefulness. There has to be a better solution since TalkBack supports API level 7+.</p> <p>I've watched both the 2011 and 2012 Google I/O sessions on accessibility, but neither seem to cover this basic use case. What's the best way to do this?</p> <p><strong>Edit 1:</strong> TLDR; Is there a way to <em>force</em> TalkBack to read some text out loud prior to the introduction of <code>View#announceForAccessibility(java.lang.CharSequence)</code> in Jelly Bean?</p>
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    1. COHow are they entering the PIN? If via an `EditText`, have you considered using `setError()` instead of a separate `TextView`? My guess is that `setError()` will be tied into the a11y framework already.
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    2. COThe layout contains a custom soft keypad that is made up of `Button` views 0-9 that are used to provide input. The digits are not displayed in an `EditText`, so unfortunately `setError()` is not an option. Good idea though. The layout is very similar to the Google Wallet unlock screen layout if that's helpful.
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    3. COfor the record, setError won't yield an announcement of the error text via TalkBack unless the user specifically presses on it (Explore by Touch). The ErrorPopup won't be included in the screens list of views, so navigating by swiping won't reach it. This means the possibly blind user must know that the ErrorPopup exists and where it is displayed or stumble upon it - which is far from reasonable UX.
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