Big Red Switch

This app calls killBackgroundProcesses() to the all installed apps and then exits automatically. Please refer to the following URL about killBackgroundProcesses:
https://developer.android.com/reference/android/app/ActivityManager#killBackgroundProcesses(java.lang.String)

NOTES
-- The app is totally bug-free. If it behaves unexpectedly, the expectation is wrong or it is due to Android's specification or bug.