Lists all files from the internal storage @return The list of internal storage files

Synchronizes the start/stop button image with the current recorder state @param running Decides whether to show the play or stop icon

Outputs the accumulated data

Returns the current lux @return

Registers a new light sensor listener Registers a new one if one is already active @param context @return

Start tracking

This detects which event occured in the current frame

Calculate the mean of one fram @param buffer @return

Calculates the var of one frame @param buffer @return

This method gets called when new monitoring data is available and should be persisted Note that the data might not be complete, but arrives in chunks

Writes the data to the filename location @param data @param filename

Stop listening for light changes @param context

Start tracking the brightness @param context @return boolean if the sensor was registered correctly