Get the GraphHopper sources and demo before you proceed.
Download and start android studio.
Open existing Android studio project and then open 'graphhopper/android' not the parent 'graphhopper'
Import project from Gradle, but make sure the 'Gradle project' points to graphhopper/android
- Connect your device in development mode (USB debugging)
- Then hit SHIFT+F10 or click Run->Run 'app' in the menu