问题
Background
Starting with some Android version (don't remember which), Android has the ability to show battery stats and mobile-data-usage (3G...) of the installed apps, so that the user will be aware of such a thing and will be able to think if the app should stay or not.
I'm talking about those:
The question
I've seen some apps on the play store that somehow fetch this data and show it to the user.
How do they do it?
How can I get the battery stats and mobile data usage of a specific app?
Is there a tutorial about this?
The only thing I've found is getting the status of the battery (charging/not charging,...).
来源：https://stackoverflow.com/questions/23312038/how-to-get-battery-mobile-data-usage-of-specific-apps