Similar to IOS, Android icons are exported at different scale factors.
Please add the option export slices to the standard android sizes:
e.g. if the icons in the designer file are MDPI (this is equiv of ios 1x), then the scale factors for each android sizes are:
xxxhdpi: 4.0 x mdpi size
xxhdpi: 3.0 x mdpi size
xhdpi: 2.0 x mdpi size
hdpi: 1.5 x mdpi size
mdpi: 1.0 (baseline)
ldpi: 0.75 x mdpi size
Taken from: http://developer.android.com/training/multiscreen/screendensities.html
and here: http://stackoverflow.com/questions/18655194/scale-factor-for-xxhdpi-android
Ps: i see in the video, that you have tick boxes for ios 1x, 2x etc, so i assume you could have additional one for android (mdpi, hdpi, xhdpi, xxhdpi):