[android] Make all models implement 'Serializable'

[dylanmckay]

This allows the models to be passed to Activity objects when creating them,

[cbornet]

In java generators this is an option.

[dylanmckay]

It doesn't look like this is supported by Android, is that correct?

If not, I can add it.

[wing328]

@dylanmckay yes please. Here is the related-code: https://github.com/swagger-api/swagger-codegen/search?l=java&q=serializableModel&utf8=%E2%9C%93

and then you can use the {{#serializableModel}} ... {{/serializableModel}} tag in the template :

swagger-codegen/modules/swagger-codegen/src/main/resources/Java/model.mustache

Line 10 in 48bdae8

{{#serializableModel}}import java.io.Serializable;{{/serializableModel}}

[wing328]

@dylanmckay may I know if you need any help adding the option?

[wing328]

Add ed via #3933 instead.