https://github.com/google/gson
compile 'com.google.code.gson:gson:2.8.2'
https://github.com/square/okhttp
compile 'com.squareup.okhttp3:okhttp:3.9.0'
https://github.com/square/okio
compile 'com.squareup.okio:okio:1.13.0'
https://github.com/square/retrofit
compile 'com.squareup.retrofit2:retrofit:2.3.0'
https://github.com/square/retrofit/tree/master/retrofit-converters/gson
compile 'com.squareup.retrofit2:converter-gson:latest.version'
Okhttp + Gson を使ったJavaによるWebAPI入門
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