This gulp task takes the asset output from Generate Mobile Assets in the Sketch plugin sketch-mobile-assets, optimizes them, and then sorts them in the output folders for iOS and Android that you define.

• You use Sketch
• You are designing for iOS and Android at the same time (one file creates assets for both platforms)
• You use sketch-mobile-assets to export your assets
• You are familiar with the command line, NPM, and Gulp

Install gulp with these instructions

• npm install gulp-imagemin
• npm install imagemin-pngquant
• npm install merge-stream

• source absolute path to your asset output folder (where you save your assets from Generate Mobile Assets)
• ios absolute path to your asset directory for your iOS project
• android absolute path to your asset directory for your Android project. optimize-assets will sort the files into the appropriate drawable Android folders

In the directory that contains gulpfile.js, run gulp in the terminal

Oh yeah!!!