Hibernate

Changes 1.33 : Added an experimental feature for geeks: the effect of "force stop" action can be enabled for deep hibernation by means of a helper shell script for ADB. Please find details on the dedicated page - http://wifiline.blogspot.com/p/hard-killing-background-processes-on.html.
On Android 5+, do not forget to re-enable the Hibernate's accessibility service.

APK Description:

Hibernate is a small utility which allows you to hibernate selected background processes. It "kills" them by means of "killBackgroundProcesses" used internally by Android to free up resources. This method differs from killing applications in the system list of running processes in the way, that it allows applications to save their state before exit, so when you return to the hibernated process back, it will be restored to its previous state.

The utility can be usefull for developers who need to test how their applications behave while being unloaded and re-loaded by the system, as well as for other users searching for a way of system optimization on-the-fly.

THIS IS NOT A TASK KILLER. The app does actually freeze selected tasks, unloading them from operating memory and preventing further CPU usage, BUT the tasks remain in the system list of "running" tasks. According to Android documentation (citation): "Note that "running" does not mean any of the task's code is currently loaded or activity -- the task may have been frozen by the system, so that it can be restarted in its previous state when next brought to the foreground." And this is the Hibernate who instructs the system to freeze selected tasks. Please, note that you may see the button "Force stop" still enabled in the "App info" system dialog for hibernated tasks. This is because they are frozen, not removed. Unlike to the hibernation, the "stopping" does forcedly and completely destroy the app. This makes a big difference.

The app DOES NOT REQUIRE rooting you device. It is designed to work without SuperUser privileges.

The app supports a service mode allowing for automatic background hibernating of specified processes. Attention: use the service mode with a caution. If some of hibernated processes are recreated constantly by themselves, the service may exhaust the battery.

The service is configured in the settings dialog. Among other things you can enable or disable service notifications about varios events.

Use the Status dialog to edit the list of currently hibernated processes.

More details on the site. FAQ is also available at http://wifiline.blogspot.com/p/hibernate-faq.html.

If you think you found a bug, please contact me via e-mail and provide as many details as possible. There exist too many different devices and Android flavours, so I can't test the app on all of them. We could try to solve your specific problems together, instead of dumb downvoting of the app.

WARNING! It is strongly recommended to not hibernate apps which are installed as widgets on your launcher or lock screen.

WARNING! On Android 5+ active tasks can not be monitored anymore by system design. As a workaround, Hibernate does now provide a special accessibility service, which must be enabled manually by user in the system Accessibility settings. Without this hibernation service will not function properly on Android 5+.

Screenshots: