This is a bit late but I had to do exactly the same thing today. So, based on my research and when using gson-2.0 you really don’t want to use the registerTypeHierarchyAdapter method, but rather the more mundane registerTypeAdapter. And you certainly don’t need to do instanceofs or write adapters for the derived classes: just … Read more
I did this research the last week and I ended up with the same 2 libraries. As I’m using Spring 3 (that adopts Jackson in its default Json view ‘JacksonJsonView‘) it was more natural for me to do the same. The 2 lib are pretty much the same… at the end they simply map to … Read more
This is a well-known issue and based on this answer you could add setLenient: Gson gson = new GsonBuilder() .setLenient() .create(); Retrofit retrofit = new Retrofit.Builder() .baseUrl(BASE_URL) .client(client) .addConverterFactory(GsonConverterFactory.create(gson)) .build(); Now, if you add this to your retrofit, it gives you another error: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 … Read more
It seems that you need to define formats for both date and time part or use String-based formatting. For example: Gson gson = new GsonBuilder() .setDateFormat(“EEE, dd MMM yyyy HH:mm:ss zzz”).create(); or using java.text.DateFormat Gson gson = new GsonBuilder() .setDateFormat(DateFormat.FULL, DateFormat.FULL).create(); or do it with serializers: I believe that formatters cannot produce timestamps, but this … Read more
You state in the comments that the returned JSON is this: { “dstOffset” : 3600, “rawOffset” : 36000, “status” : “OK”, “timeZoneId” : “Australia/Hobart”, “timeZoneName” : “Australian Eastern Daylight Time” } You’re telling Gson that you have an array of Post objects: List<Post> postsList = Arrays.asList(gson.fromJson(reader, Post[].class)); You don’t. The JSON represents exactly one Post … Read more
you could try reading the gson value like this: try { AssetManager assetManager = getAssets(); InputStream ims = assetManager.open(“file.txt”); Gson gson = new Gson(); Reader reader = new InputStreamReader(ims); GsonParse gsonObj = gson.fromJson(reader, GsonParse.class); }catch(IOException e) { e.printStackTrace(); } Assuming that you are just receiving this one block and not a list. And also this … Read more
There’s a simple solution: Gson’s RuntimeTypeAdapterFactory (from com.google.code.gson:gson-extras:$gsonVersion). You don’t have to write any serializer, this class does all work for you. Try this with your code: ObixBaseObj lobbyObj = new ObixBaseObj(); lobbyObj.setIs(“obix:Lobby”); ObixOp batchOp = new ObixOp(); batchOp.setName(“batch”); batchOp.setIn(“obix:BatchIn”); batchOp.setOut(“obix:BatchOut”); lobbyObj.addChild(batchOp); RuntimeTypeAdapterFactory<ObixBaseObj> adapter = RuntimeTypeAdapterFactory .of(ObixBaseObj.class) .registerSubtype(ObixBaseObj.class) .registerSubtype(ObixOp.class); Gson gson2=new GsonBuilder().setPrettyPrinting().registerTypeAdapterFactory(adapter).create(); Gson gson = … Read more
You can parse the JSONArray directly, don’t need to wrap your Post class with PostEntity one more time and don’t need new JSONObject().toString() either: Gson gson = new Gson(); String jsonOutput = “Your JSON String”; Type listType = new TypeToken<List<Post>>(){}.getType(); List<Post> posts = gson.fromJson(jsonOutput, listType); Hope that helps.
You would write a custom deserializer that returns the embedded object. Let’s say your JSON is: { “status”:”OK”, “reason”:”some reason”, “content” : { “foo”: 123, “bar”: “some value” } } You’d then have a Content POJO: class Content { public int foo; public String bar; } Then you write a deserializer: class MyDeserializer implements JsonDeserializer<Content> … Read more
Late to the party, but you can use a converter. RestAdapter restAdapter = new RestAdapter.Builder() .setEndpoint(“https://graph.facebook.com”) .setConverter(new DynamicJsonConverter()) // set your static class as converter here .build(); api = restAdapter.create(FacebookApi.class); Then you use a static class which implements retrofit’s Converter: static class DynamicJsonConverter implements Converter { @Override public Object fromBody(TypedInput typedInput, Type type) throws ConversionException … Read more