Thanks to digiKam's geocorrelation capabilities, you can geotag photos using a GPX file created with apps like Open GPS Tracker. But there is also another way to use your Android device for geotagging. The built-in camera app of most Android devices is capable of geotagging photos. This means that you can take a geotagged snap with the Android camera and then transfer geographical coordinates from it to other photos using digiKam.
This is a companion discussion topic for the original entry at https://www.digikam.org/news/2012-10-29_geotag_photos_with_android_camera_and_digikam/