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copied!<p>Assuming that the different possible JSON requests you may have are not extremely different to each other, I suggest a different approach, simpler in my opinion.</p> <p>Let's say that you have these 3 different JSON requests:</p> <pre><code>{ "type":"LOGIN", "username":"someuser", "password":"somepass" } //////////////////////////////// { "type":"SOMEREQUEST", "param1":"someValue", "param2":"someValue" } //////////////////////////////// { "type":"OTHERREQUEST", "param3":"someValue" } </code></pre> <p>Gson allows you to have a single class to <em>wrap</em> all the possible responses, like this:</p> <pre><code>public class Request { @SerializedName("type") private String type; @SerializedName("username") private String username; @SerializedName("password") private String password; @SerializedName("param1") private String param1; @SerializedName("param2") private String param2; @SerializedName("param3") private String param3; //getters & setters } </code></pre> <p>By using the annotation <code>@SerializedName</code>, when Gson try to parse the JSON request, it just look, for each named attribute in the class, if there's a field in the JSON request with the same name. If there's no such field, the attribute in the class is just set to <code>null</code>. </p> <p>This way you can parse many different JSON responses using only your <code>Request</code> class, like this:</p> <pre><code>Gson gson = new Gson(); Request request = gson.fromJson(jsonString, Request.class); </code></pre> <p>Once you have your JSON request parsed into your class, you can transfer the data from the <em>wrap</em> class to a concrete <code>XxxxRequest</code> object, something like:</p> <pre><code>switch (request.getType()) { case "LOGIN": LoginRequest req = new LoginRequest(request.getUsername(), request.getPassword()); break; case "SOMEREQUEST": SomeRequest req = new SomeRequest(request.getParam1(), request.getParam2()); break; case "OTHERREQUEST": OtherRequest req = new OtherRequest(request.getParam3()); break; } </code></pre> <p>Note that this approach gets a bit more tedious if you have many different JSON requests and those requests are very different to each other, but even so I think is a good and very simple approach...</p>

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