buildConfigField "String[]", "URL_ARRAY",
        "{" +
        ""http:someurl"," +
        ""http:someurl"," +
        ""http:someurl"" +
        "}"

buildConfigField "java.util.Map<String, String>", "NAME_MAP",
                 "new java.util.HashMap<String, " +
                 "String>() {{ put("name", "John"); put("name1",  "John"); put("name2", " +
                ""John"); }}"

HashMap<String, String> name = (HashMap<String, String>) BuildConfig.NAME_MAP;

buildConfigField "java.util.Set<String>", "MY_SET", "new java.util.HashSet<String>() {{ add("a"); }};"

nonNullStringArray=new String[]{ n
    "foo",n
    "bar"n}

buildConfigField "String[]", "nonNullStringArray", (project.findProperty("nonNullStringArray") ?: "new String[]{}")

buildConfigField "String[]", "nullableStringArray", (project.findProperty("nullableStringArray") ?: "null")