As the owner of an Xperia Z3, I found myself missing Stamina Mode after flashing a CM12 ROM. None of the battery apps in the Play Store worked the same way - most of the ones I found merely disabled Wi-Fi/data while the screen was off, along with managing auto-sync, but I still wanted whitelisted apps to be able to access the internet.
I spent a good 12 hours straight working to replicate the basic features of Stamina Mode, and now here we are: Power Nap for Xposed!
Imgur album link for easier viewing: http://imgur.com/a/JvSD8
Compatible with any Android device running 4.1+, with root and Xposed.
Power Nap for Xposed is the best app for saving battery. When your screen is off, Power Nap maximizes your device's deep sleep time by stopping services, alarms and wakelocks from waking the device when the screen is off. This means you can leave Wi-Fi/data on and still get the notifications from apps you have whitelisted, while all others are unable to wake up your device, leading to an increase in your battery life.
Power Nap for Xposed also has a Low Battery Mode, where you can selectively functions to save power when battery level is low.
Power Nap for Xposed is inspired by Sony's Stamina Mode, but accessible for all Android devices 4.1 and higher. This app requires root and Xposed.
Be sure to whitelist any third-party alarm clock app you are using, or it will be prevented from waking up your device!
android.permission.INTERNET: this is for Crashlytics only, which will automatically send me stack trace logs if the app crashes due to something non-Xposed related. No other information is being sent.
android.permission.WRITE_SETTINGS: For Low Battery Mode, to change screen brightness and screen display timeout
android.permission.READ_SYNC_SETTINGS: For Low Battery Mode, to check if auto-sync is on/off
android.permission.WRITE_SYNC_SETTINGS: For Low Battery Mode, to turn on/off auto-sync
android.permission.ACCESS_WIFI_STATE: For Low Battery Mode, to check if Wi-Fi is on/off
android.permission.CHANGE_WIFI_STATE: For Low Battery Mode, to turn on/off Wi-Fi
android.permission.ACCESS_NETWORK_STATE: For Low Battery Mode, to check if mobile data is on/off
android.permission.BLUETOOTH: For Low Battery Mode, to check if Bluetooth is on/off
android.permission.BLUETOOTH_ADMIN: For Low Battery Mode, to turn on/off Bluetooth
android.permission.RECEIVE_BOOT_COMPLETED: For Low Battery Mode, to start a service that monitors the current battery level (if LBM is enabled), when the device is finished booting
To get the app, you can either opt-in for testing on Google Play (and/or join the G+ Alpha testing community if you're interested in helping out by reporting bugs and sharing your experiences), or simply download it directly from the Xposed Module Repository. You may need to change "Versions to be shown" to "Experimental" in the Xposed Installer's Settings to be able to download it using the app.
The latest APK version is also attached to the "Download" tab of this thread, but you will not receive updates using this method.
By using Power Nap, you can expect to see as little as 0.2% battery drain per hour (if you don't have many apps whitelisted) during standby. Results may vary by device and depending on which apps have been whitelisted.
Since it's in Alpha mode, please feel free to leave feedback and report bugs. If you need any clarifications on any aspect of the app, please leave a comment!
NEW ISSUE TRACKER - POST ISSUES HERE
Power Nap for Xposed, Xposed for all devices (see above for details)
Xposed Package Name: net.jzhang.powernap
Current Beta Version: 0.8a
Beta Release Date: 2015-04-09
Last Updated 2016-10-22