All,
I've been writing some code to toggle the screen from "bright" to dark
(off). I've been using this code to turn the screen off:
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 0;
getWindow().setAttributes(lp);
And this to turn it back on:
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.screenBrightness = 1;
getWindow().setAttributes(lp);
The problem is, it's very difficult to wake the screen back up because
of all the power saving things that go into effect when you turn the
screen "off" using brightness = 0; Let me first point out that I'm
not really tied to power constraints in this particular application.
One of my assumptions is that this device (Droid) will be plugged in
when this application is run. Ideally, I'd like to not hammer the
battery if I don't have to, but I'm open to it if it's the only way.
So, back to the issue...when the display is off, pretty much
everything shuts down. For instance, one idea I had was to shake the
display back awake by reading the accelerometer. However, as soon as
the display goes off, my listener that was reading values from the
accelerometer (be it in an activity or a service) stops echoing
values.
I can't register any key listeners because when the display is off, if
I press anything other than the unlock button (e.g. volume up/down,
camera button, etc.) I get the following output in the debugger:
WindowManager: No focus window, dropping: KeyEvent...etc.
In short, it appears that once the display goes dark, the only way to
interact with the user is by hitting the "unlock" button. This isn't
ideal because it's awkwardly placed.
I had *really* hoped to be able to re-activate the device by pressing
anywhere on the touch screen. I can understand that the touch screen
is disabled for power reasons, but I was hoping I could override that
(given I don't mind the power draw). Failing at that, I'd settle for
any of the accessible keys (even the keyboard) reacting to user input
and waking the thing up.
Any thoughts or ideas on this subject?
Thanks for your time.
Wes
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