This app is an widget for logging your location.
Put an widget of OneTapLog on home screen, and just tap it. App will log your location with timestamp.
You can create a CSV file of logs in Setting. So send it to PC, and use it with text editors or something else.
App also has AutoRecording mode, which automatically log your location by set intervals.
If your device's OS is greater than Android4.2, you can tap widget without unlocking device, since you can put an widget on lock screen.
Any feedbacks with device name and OS version are welcomed!