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【Android】RetrofitのGETリクエストで配列を渡したい

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サーバー側で、Parameters: {"hoges"=>["1", "2", "3"]} みたいな感じで、配列を受け取りたい。
POSTやPUTだと、

@Field("hoges[]") List<String> hoges

とできるが、GETだとできない。公式にものっていない。

https://github.com/square/retrofit/issues/472
Jake本人による説明があった。
インターフェースで可変長引数を使えば良い。

インターフェース側
@GET("/hoges.json")
    public Observable<Hoges> getHoges(@Query("hoges[]") String... hoges);
呼び出し側
String[] hoges = {"1", "2", "3"};
observable = restAdapter.create(RetrofitApi.class)
                    .getHoges(hoges);
生成されるリクエスト
/hoges.json?hoges[]=1&hoges[]=2&hoges[]=3
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