Monday, December 13, 2010

Re: [android-developers] Querying battery status synchronously

Sorry, there isn't a way to do this.  The best you can do is query the current battery level (which is part of a sticky broadcast so the last reported value is always available).

On Mon, Dec 13, 2010 at 6:11 PM, Thomas Okken <thomas_okken@yahoo.com> wrote:
I'm working on an app that needs to adapt its behavior to the current
battery status. When there's plenty of juice left in the battery, it
may perform certain tasks in a way that maximizes responsiveness, but
also drains a lot of power, while in a low-battery situation, it
should automatically adjust its behavior in a way that maximizes
battery life, even if that makes certain tasks run more slowly.

My question is this: I know how my app can be informed when the
battery *starts* running low, by registering a BroadcastReceiver with
a BATTERY_STATUS_LOW intent. I've implemented this, and I've verified
that it works; at the exact moment that the OS pops up the low-battery
warning, my app also receives the broadcast, and goes into low battery
mode.

So far, so good... But what can I do to find out if the battery was
low before my app was even launched?

It seems like the app never gets the BATTERY_STATUS_LOW intent message
if the battery was low before the app was even launched. I can't seem
to find an API that lets me query the battery status *right now*, i.e.
without having to register a receiver that will only get notified when
the battery status *changes*.

Is there a way to find out *immediately* whether the battery status is
"LOW" or "OKAY"?

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Dianne Hackborn
Android framework engineer
hackbod@android.com

Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails.  All such questions should be posted on public forums, where I and others can see and answer them.

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