Flight information, indoor maps, weather, hotels, airport information for Tokyo Haneda Airport (HND)

• 3 days worth of arrivals and departures information (yesterday, today and tomorrow)
• Detailed map showing your current location within the airport, location of restaurants, bars, banks, toilets, shops etc.
• General airport information (from Wikipedia) and airport news (from Twitter)
• Facility to locate and book hotels nearby

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.