At least on iOS you can indeed. It's available from UIDevice.
And if you're doing something that sucks up battery, you should know about it and act accordingly.
If you're not doing heavy lifting, It's just not something you should have to think about as an app developer, there are so many other areas to focus on to keep users happy.
Apple has a few WWDC sessions that talk about it I think.
Here's what they have to say in their "performance tuning" section:
The dev bytes cited in the article are specifically focused on Android development. Android provides some interesting framework classes that help with making requests efficiently to the network, both from a power and speed standpoint. A lot of these APIs are really underused (e.g. SyncAdapter) in apps right now, so Google clearly wants more devs to use it since it requires less thinking.
And if you're doing something that sucks up battery, you should know about it and act accordingly.
If you're not doing heavy lifting, It's just not something you should have to think about as an app developer, there are so many other areas to focus on to keep users happy.
Apple has a few WWDC sessions that talk about it I think.
Here's what they have to say in their "performance tuning" section:
https://developer.apple.com/library/ios/documentation/iphone...