[BRLTTY] New Android apk.

[Robert Pösel]

Hi,

quick comment about notification: It shouldn't be showed when BRLTTY 
service is disabled. Currently when I enable BRLTTY service, 
notification is showed, when I disable it, it hides the notification for 
a moment, but in few seconds shows it again (with text "Waiting").

And similar situation with "Release Braille Device" option. When BRLTTY 
is disabled and I open its settings and change the option, notification 
gets showed.

Note when I set "Release Braille Device" to true and then disable BRLTTY 
service as a whole, notification is hide and won't show up automatically 
unless I start the service again (which is correct) or until I change 
the "Release Braille Device" option again (which is wrong as described 
above).

Another small issue is that notification icon is all black (at least on 
newer Android versions), because Android shows notification icons only 
in single color (either pixel is black, or fully transparent) and as 
your icon is normal (full color, not transparent) bitmap, it shows all 
pixels as black.

Also, perhaps you already know this, but since Android API 20 you can 
show up to 3 actions (buttons) on notification, e.g., you can add action 
to quickly switch the "Release Braille Device" option. See 
https://developer.android.com/reference/android/app/Notification.Builder.html#addAction(android.app.Notification.Action)

Robert