Google has in the context of the developer conference I / O 2015 Android M with six major innovations introduced. This includes changes that are to extend the term of Android devices, especially in standby. H has Android M installed on a Nexus 5 and tested the new energy-saving options.
Doze - slumber or dozing in German - is a new mode in Android M, which
will be activated by the system when the device is not loaded and does
not move at the same time. During this phase Android M to put the unit into a sleep mode to consume very little power.
In a permanent deep sleep the device is however not offset, instead it
wakes up in intervals for a short time in order to execute app syncs and
pending tasks.
The Android device is in Doze mode, certain restrictions on the apps installed on the device apply.
Applications no longer have access to the Internet as long as they are not through the Google Cloud Messaging are "tickled awake" high priority as it describes Google. So-called Wake Locks are ignored by the system during active Doze. About a Wake Lock, an app to tell the system that it is reliant on your device to be activated.
Alarms on the Alarm Manager were planned are disabled during execution of Doze.
They exclude those alarms that have been defined in the Alarm Manager
so that they may also be triggered during inactivity, and alarms that
have been set on the method setAlarmClock (), so the alarm clock function. In addition, no wireless scans and synchronizations and tasks during Doze Sync Adapter and the Job Scheduler performed.
Once the device wakes up from Doze, which may be caused by movements
such as the lifting of the telephone, open tasks and synchronizations
are carried out.
App Standby
Another new feature in Android M is the app standby.
With Standby Android App M defined by a certain time each app as
inactive when the OS is not certain signals obtained by the application. One of the signals is, for example, that the user explicitly starts the app.
An app is currently in the foreground, it is as an activity or service,
or is in use by another activity or another foreground service, the app
remains from standby also.
Not to App Standby also occurs if an app triggers an alert that is
displayed on the lock screen, or the filing of notifications. Furthermore, the user always has the choice, an app on the settings of the system explicitly excluded from the App standby.
If the device is not loaded, for apps, which adopts the system that
they are inactive, the network access disabled and exposed
synchronizations and tasks. When you load the previous status will be restored, and these operations are carried out. If the terminal for a long time not being used, inactive applications may according to Google "about once a day" to access the network.
Measurements
To try Doze and Standby app, a was Nexus 5 recorded with the first developer preview of Android M. The test was performed on a Nexus 5 as currently the only compatible with Android Tablet M, which was not available 9 Nexus. For Tablets Doze is probably even more important, because they are less moved than smartphones. Therefore, the values were determined without an active wireless connection in order to emulate this scenario better.
Google is currently planning three preview versions before the third
quarter of this year, the final version of Android M to be delivered. The selection of apps was identical for testing on Android and Android 5.1.1 M Lollipop. The Nexus 5 was sent with the following configuration and the same accounts in both tests:
- is no SIM card
- Bluetooth, NFC, Android Beam disabled
- Wi-Fi, GPS (accuracy) activated
- Status LED and all tones disabled
- other settings to factory state of Android 5.1.1 and M
- configured three IMAP mail accounts, a Gmail account with default settings
- Installed and logged in Facebook and Facebook Messenger
- Talon for Twitter (Plus) installed and registered
- In addition, the following apps off the system apps installed: 9GAG First, AirDroid, Android Wear, BeyondBod, CalDAV Sync, Chrome Beta, Chrome Remote Desktop, Chromecast, ES File Explorer, Feedly, Google handwriting input, Hangouts Dialer, IMDb, Inbox, VLC , Yahoo Weather, Wikipedia
To test both Android installations were connected to a wireless router
type Vodafone Easybox 904 xDSL, who was placed in the same room at a
distance of about three meters without obstacle.
The unit was each with a fresh Android installation and configuration
as well as the aforementioned full battery charge placed on a wooden
table and use until the end of the test after 48 hours to check the
remaining battery capacity.
| Compare standby consumption Nexus 5 after X hours in percent | |||
|---|---|---|---|
| 8 * | 24 * | 48 | |
| Android 5.1.1 | 4.0% | 12.0% | 24.0% |
| Android M DP 1 | 1.5% | 4.5% | 9.0% |
| * Projected value | |||
| Projected maximum term standby | |||
| Android 5.1.1 | 200 hours | ||
| Android M DP 1 | 533 hours | ||
With Android 5.1.1 a standby consumption was established 24 percent of battery capacity on the Nexus 5 to 48 hours. This figure has been projected for a 24-hour day and a typical night of 8 hours down. As a maximum term standby This results in 200 hours. The Nexus 5 with Android M loses in the same period just 9 percent of its battery capacity. This corresponds to a standby period, which has improved by a factor of 2.7. A Nexus 5 could spend in standby when not in use so absolute about 22 days. By comparison, a Nexus 5 with Android 5.1.1 should already after 8 days to the electrical outlet.
Conclusion
Google has managed already to the first developer preview of Android M remarkable.
Thanks to numerous adjustments to the system determined by the H
standby duration of Nexus 5 is not being used well beyond the Android
5.1.1 with lollipop.
Because there still is a preview of the operating system, the measured
values can naturally deteriorate to the final version yet, or even
improve. Nevertheless, the values that Google has clearly optimized in the correct direction. H has thus far been tested only on a smartphone Android M. However, it can already say for tablets that can be expected significantly longer standby runtimes.
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