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I would like to create an android app that checks the external battery state (charge via micro USB).
I have checked the BatteryManager, UsbAccessory and UsbManager classes it seems non functional.
So any hints?
Thank you.
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Check battery life & useOpen your phone's Settings app. Under "Battery," see how much charge you have left, and about how long it will last. For details, tap Battery. For a graph and list of battery use, tap Battery Usage.
Go to the activity_main. xml file, which represents the UI of the project. Add a Button, so whenever the user will click on the Button a Toast message with battery percentage will be popped up on the screen.
Select Search on the taskbar, type Command prompt, press and hold (or right-click) Command prompt, and then select Run as administrator > Yes. At the command prompt, type powercfg /batteryreport, then press Enter. The battery report will be an HTML file that's stored in a folder on your PC.
Android has a few hidden codes that you can punch into your Phone app to access testing menus. One of these displays a variety of info about your device, including its battery health. To see it, open your dialer and type *#*#4636#*#*.
As far as the phone is concerned, an external battery is just a power source like a normal charger. There is no communication; in fact these external batteries short-circuit the two data pins of the USB port to signal their prescence. Since they also contain circuitry to produce constant 5v output voltage the phone has not even a theoretical chance of knowing the battery state. I'm sorry but you are fighting a losing battle here, you will only be able to tell whether the phone is still receiving sufficient power from the external battery or not.
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