This app continuously captures camera images in the background for timelapse videos (see video link for a sample).
Delay between images is adjustable down to 1 second.
Normal phone operation can continue with minimal CPU load.
Note: images are saved on SD card as JPEG. Not yet tested on Android 10, which introduced changes to external storage handling.
This app is open-source under GPL. The source code is available at https://github.com/floe/Background-Timelapse
Updated after roughly 7 years! Tested on Android 9, still works.
9Apps 4.9
