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Start by adding a scheduled period. You might be happy with just one time period that starts in the morning by turning on mobile data, Wi-Fi and the ringer sound and ends when you normally go to bed when the ringer and the network radios should be switched off.
Press the + Button at the bottom of the main screen. A dialog will open where you can add the required details for the scheduled period:
This option saves battery power and reduces mobile data usage. Interval connection turns off Wi-Fi or Mobile Data when the device is not used and only re-connects at regular intervals for a short duration (interval and duration can be changed in settings) to fetch new messages. It is also turned on when the device is unlocked. This option can be enabled for Wi-Fi or Mobile Data during the active times of a period. For Wi-Fi on android 4.4.2 (KitKat) this option should be used with care (see the known issue at the bottom of the page).
The red dot in the lower right corner of a scheduled period indicates that the scheduled period is currently active. This is also the case if it was activated manually.
Long-press on a scheduled period to show the context menu:
Long-press on the item to see the context menu. Then chose 'Activate now'.
Long-press on the item to see the context menu. Then chose 'Skip next occurrence'. The skip-icon will be shown in the lower right of the period. If the scheduled period is already active, it will not be switched off (or switched on if it is a period that switches things off).
If you want to temporarily override the re-connecting behaviour and keep Wi-Fi or mobile data always on or always off then long-press the active period and un-check the respective interval connection entry. The interval connection symbol will turn black as a result:
Long-press on a schedule to see the context menu. Then chose 'Move up' or 'Move down'.
Starting with Jelly Bean Android does not allow to change flight mode through code unless the phone is rooted. However, you can schedule silent mode. To minimize battery drain by cell standby make sure to keep the phone in a location with good reception. At some point in the future we might provide a version for rooted phones that includes this option.
Network Scheduler needs to be notified after a reboot of the device to schedule the configured periods. However, on Android this is not supported for apps on the SD card. Additionally, Network Scheduler uses Android AlarmManager to be notified to start / stop a configured schedule. This is also not possible for apps on the SD card. This is the documentation by google.
No. There is no service constantly running in the background. Network Scheduler is notified by the system when it's time to switch a sensor on or off. To limit the power consumption of Network Scheduler even further you can specify a long connect interval, such as once every hour for the interval-connection feature. But even with a 15 minutes interval the battery use is negligible.
Prevent phone from sleeping: Wake up the phone when it is time to switch a radio on or off
Control vibration: Vibrate to notify that a radio is going to be switched off soon, if configured (see Settings)
Run at startup: Re-scheduling the switch-on/-off times is necessary after a reboot of the device
Access Bluetooth settings, pair with Bluetooth devices: Toggle Bluetooth radio
View network connections: Check if Wi-Fi is connected (for the 'Keep Wi-Fi connected' setting), Check if Mobile Data is enabled
View Wi-Fi connections: Check if Wi-Fi is enabled or not
Change network connectivity: Toggle Mobile Data
Connect and disconnect from Wi-Fi: Toggle Wi-Fi
Modify or delete the contents of your SD card: Write / Delete Log File
This is a known issue on Android 4.4.2. I'm having this issue on my Nexus 7 (2012). Apparently all battery saver apps suffer from this. You can improve your situation with the following setting:
In the device settings go to the advanced Wi-Fi settings and check 'Scanning always available'. This will have some effect on the battery, especially when location service and other apps require a location. On the other hand this might save energy because the alternative is using the GPS sensor which might have an even greater effect on the battery.