The viewer app of www.hellowork.go.jp.
It can also save the search result.
https://play.google.com/store/apps/details?id=com.kt3k.app.hw
Put ant.properties at the top of the project with the contents like:
key.store=Key store file
key.store.password=The password for it
key.alias=Key store alias
key.alias.password=The alias password
And then, hit the command
make release
Then you'll get bin/hw-release.apk
as a release build.