Assumes one main obb file and no patch obb file.

haxelib dev android-expansion android-expansion
cd android-expansion
cd samples/DisplayingABitmap/
haxelib run nme test android -gradle

You should see an orange NME logo. Now close the app. For testing we're going to use 'android-expansion push' which assumes you have Android 6.0 on your phone, go ahead and update the OS if you're under 6.0.

haxelib run android-expansion zip io.nme.samples.displayingabitmap 181 main-expansion
haxelib run android-expansion push io.nme.samples.displayingabitmap 181

Open the app, you should now see a Pink NME logo. Now look at the sample to see how it works.

open project.nmml
open Source/Main.hx

Test to make sure your app can launch without the obb file. You can remove the obb file using adb shell.

adb shell
cd /mnt/shell/emulated/obb
ls
cd io.nme.samples.displayingabitmap
rm main.180.io.nme.samples.displayingabitmap.obb

Once your APK and OBB file are ready through Google Play you should also test that your app properly downloads the obb file when it has been removed.