Android Service Fails To Connect To Server When The Activities Are In The Background

this is my first post on stackoverflow so I hope I am doing everything correctly. I am developing my first android App and I am experiencing weird behavior on some devices. I have

Solution 1:

It may be related some kind of "Battery optimization" which could prevent background apps from accessing the network -- see, for example, https://www.reddit.com/r/Xiaomi/comments/4r6eld/does_battery_optimization_ever_work_for/

after i had some problems with background apps on MIUI, i figured it hat something to do with the battery saver feature in MIUI. When i just set "Manage apps' battery usage" to standard, the background apps rarely work, even if they have autorun permission. "Rarely work" means: Google Inbox does not sync, Google Maps does not track, some location based apps (like Rain Alarm) do not show rain notifications, and so on.

I had to set EVERY of these apps to the exception list, so that the battery optimization does not affect them. [...]

So, it may be that Xiaomi users (and users whose devices have similar functionality) need to manually add your app to a whitelist.

I don't know if "optimization" settings like these are on by default -- I would certainly hope they aren't.

Solution 2:

Check following permission added in manifest file

<uses-permissionandroid:name="android.permission.INTERNET" /><uses-permissionandroid:name="android.permission.ACCESS_NETWORK_STATE"/>