Am I doing something wrong? The first time my app runs this code it
runs it from the Configuration page and it works just fine, the second
time it comes up with a nullpointerexception, the code is this:
IntentFilter batteryLevelFilter = new
IntentFilter(Intent.ACTION_BATTERY_CHANGED);
rawlevel = registerReceiver(null,
batteryLevelFilter).getIntExtra("level", -1);
I know that registerReceiver doesn't like to run from the
AppWidgetProvider, so is it something to do with the class being
called by the onUpdate()? I don't know if I need to do anything
special but I can't seem to get it to run this line of code to save my
life.
Also as a side note I tried using this
int rawlevel = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
and it can't resolve BatteryManager.EXTRA_LEVEL even after importing
BatteryManager and setting the minSDK to 8.
On Feb 3, 8:30 pm, AndroidDevTime <[email protected]> wrote:
> what are the power battery performance implications of maintaining a
> service? Will this drain the battery more to keep a service up and
> running? Especially if you bind to the service from the widget to
> call service functions?
>
> On Feb 3, 3:39 pm, Mark Murphy <[email protected]> wrote:
>
>
>
>
>
>
>
> > 2011/2/3 Jeffrey <[email protected]>:
>
> > > Thank you, one last issue that I'm having, you said to get the battery
> > > level to call registerReceiver with a null broadcast receiver, but
> > > when I try the following code I get a nullpointerexception:
>
> > > int rawlevel = registerReceiver(null,
> > > batteryLevelFilter).getIntExtra("level", -1);
>
> > > I'm not sure if thats right or not. When I was running a broadcast
> > > receiver it grabbed the context and the code was as such:
>
> > > int rawlevel = intent.getIntExtra("level", -1);
>
> > > which worked but since I no longer use the broadcast receiver to grab
> > > the intent I can't seem to figure out how to get it into a manageable
> > > variable.
>
> > There are two possibilities:
>
> > 1. Your batteryLevelFilter is incorrect
>
> > 2. Your code is being called before an ACTION_BATTERY_CHANGED
> > broadcast has been sent
>
> > Since #2 is conceivable, depending on when you are setting up your
> > alarms, be sure to handle a null response to registerReceiver().
>
> > Also, I would use BatteryManager.EXTRA_LEVEL instead of "level".
> > That's a change I need to make in one of my own examples, one of these
> > days...
>
> > --
> > Mark Murphy (a Commons
> > Guy)http://commonsware.com|http://github.com/commonsguyhttp://commonsware.com/blog|http://twitter.com/commonsguy
>
> > Android Training...At Your Office:http://commonsware.com/training
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