Android Power Optimization: May the Power be with you
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This document discusses various techniques to optimize mobile apps for battery performance. It suggests reducing unnecessary background activities, deferring tasks until the phone is charging, batching network requests, limiting location updates and syncing, adjusting for connection type and charge level, and using tools like Battery Historian to monitor battery usage and identify areas for improvement. The overall message is that optimizing for battery life requires understanding how power is consumed and making strategic tradeoffs between features, performance and energy efficiency.
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Android Power Optimization: May the Power be with you
- 1. May The ‘P wer’ be with you - Prajyot Mainkar
- 4. Users Care about their Battery Battery Life WiFi Speed/Quality Touch Screen Screen/Display Size Display Type/ Quality Connectivity Memory Display Resolution 0 10 20 30 40 50 60 70 80 90 100 38% 42% 44% 46% 46% 48% 52% 72% Source: Qualcomm Band Tracker, Market Search Group, US
- 6. WWW.COMPANY.COM Battery is Part of User’s Experience
- 8. ..and this is what it should ends like 20-30% Core Functions 70% ADs, GPS, Analytics Reduce the Battery Consumption
- 9. Where does the power go? CPU RADIOS SCREEN Screen OFF e.g. wakelocks e.g. syncs, n/w activities Background Activities Screen ON
- 10. Design Principal Reduce Defer Coalesce Say Minimum/ lesser background activities If required, defer it to when the phone is plugged in Coalesce it with other activities to reduce wakeup overhead
- 11. Doze ( Marshmallow) Significant Motion Detector is needed for tracking Coalesce
- 12. Doze ( Android N) Significant Motion Detector is needed for tracking
- 13. App Standby System determines the state of an app is idle when the user is not actively using it. It understands the app that is not being touched but also takes into consideration that NONE of these should imply: The user explicitly launches the app. The app has a process currently in the foreground (either as an activity or foreground service, or in use by another activity or foreground service). The app generates a notification that users see on the lock screen or in the notification tray.
- 15. Knowing Your Location More Accurate More Power GPS Provider Less Accurate Less Power Cellular Network Provider Passive Provider To Your App
- 16. setInterval() Dilemma? 120ms 120ms 120ms More Accurate Data? Saving Battery Juice V/s
- 17. Location Flooding 120ms 120ms 120ms setInterval of other apps can affect your app setFastestInterval() setFastestInterval() 20ms 20ms 20ms
- 18. Back off based on User Behaviour Saves Battery Wait 2X Longer Sync Sync Sync Wait 2X Longer Exponential Backoff
- 19. PRIORITY_BALANCED_POWER_ACCURACY Seeking Accuracy? PRIORITY_HIGH_ACCURACY PRIORITY_LOW_POWER PRIORITY_NO_POWER Better Accuracy Better Battery
- 20. Do Less,When You Can Do you really need GPS? Approximation? Ask the User Carry On YesNo YesNo You are Safe! Use Proximation in Action to reduce the resource usage Less time, Less process results but still meeting user’s needs Approximation of Pixels
- 21. 2. Networking for GrowthNetworking for Growth
- 22. The ‘Networking’ Pain More Network More Memory GPS All the Time!
- 23. WWW.COMPANY.COM Sync Less More ‘Power’ to you
- 24. Understanding “Networking” Do Now Server Response Data Push Optimization is Possible
- 25. Think of a good time! Uploading of Files/Songs Cropping of Images Loading of Data
- 26. Sync Smartly
- 27. Say ‘Bye’ to Polling New News? No New News? No New News? No New News available OK
- 28. Prefetch Data A way to avoid number of independent data transfer sessions Allows user to download all the data in a given period in a single burst & connection, at full capacity. Reduces radio activations and bandwidth, improves battery life and latency. e.g Music Player, News reader
- 29. Batch Transfer & Connections Bundle your data transfers and create a pending transfer queue Transfer as much data as possible during each transfer session to limit the number of sessions you require
- 30. Care about Network State WiFi will be fast and Cheap - give priority Avoid connections if NO Network is available. Manipulate Broadcast receivers on demand Are you on Roaming?
- 31. Varying Download pattern Modify the pattern based on connection type.Also, think behaviour type Download more data per session on faster networks ..but involve user in this scene Force a quicker pre-fetch
- 32. Monitor Charge Level & State Dock Types Car Desk Low-End (Analog) Desk High-End (Digital) Desk Maximise app updates and its frequency when battery is charging Avoid updates when charge state is discharging Opt to update the frequency of update when charged with desktop dock than car dock
- 33. Programatically control the features Darker Color, Lesser Consumption Brightness Level have more impact
- 34. WakeLock, Really? Issue/Issues batch? Job Scheduler
- 35. Checking the stats Wakelock Time Network Time
- 37. Gather Insight Action Use the tools that help you gather the information - GPU, CPU or Battery Usage What it means, and how it will impact your program Act on it and repeat! 1 2 3 The LifecycleUnderstanding which tool to use, to understand what data and then where to look into the code
- 38. “Before the battle of the fist comes the battle of the Performance.”
- 39. Pr@jyot Mainkar Director/Androcid Media Pvt. Ltd. (www.androcid.com) @prajyotm /prajyotmainkar +prajyotmainkar Thank you!