Gson – convert from Json to a typed ArrayList

by

You may use TypeToken to load the json string into a custom object.

logs = gson.fromJson(br, new TypeToken<List<JsonLog>>(){}.getType());

Documentation:

Represents a generic type T.

Java doesn’t yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval the type information even at runtime.

For example, to create a type literal for List<String>, you can create an empty anonymous inner class:

TypeToken<List<String>> list = new TypeToken<List<String>>() {};

This syntax cannot be used to create type literals that have wildcard parameters, such as Class<?> or List<? extends CharSequence>.

Kotlin:

If you need to do it in Kotlin you can do it like this:

val myType = object : TypeToken<List<JsonLong>>() {}.type
val logs = gson.fromJson<List<JsonLong>>(br, myType)

Or you can see this answer for various alternatives.

More Related Contents:

  1. Get nested JSON object with GSON using retrofit
  2. How to Parse JSON Array with Gson
  3. How to parse json parsing Using GSON in android
  4. How to parse JSON Array (Not Json Object) in Android
  5. Retrofit Expected BEGIN_OBJECT but was BEGIN_ARRAY
  6. What is the basic purpose of @SerializedName annotation in Android using Gson
  7. Deserializing Generic Types with GSON
  8. Converting json string to java object?
  9. How to convert JSONArray to List with Gson?
  10. Gson turn an array of data objects into json – Android
  11. Retrofit GSON serialize Date from json string into java.util.date
  12. No response from jsonArray request [closed]
  13. “Expected BEGIN_OBJECT but was STRING at line 1 column 1”
  14. How can I convert JSON to a HashMap using Gson?
  15. Gson: How to exclude specific fields from Serialization without annotations
  16. JSON Array iteration in Android/Java
  17. Difference between JSONObject and JSONArray
  18. Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2
  19. Jackson Vs. Gson [closed]
  20. Custom JSON deserializer using Gson
  21. Sending a JSON HTTP POST request from Android
  22. How to decode JSON with unknown field using Gson?
  23. Convert JSONArray to String Array
  24. class A declares multiple JSON fields
  25. google gson LinkedTreeMap class cast to myclass
  26. How to use parameters with HttpPost
  27. Setting Default value to a variable when deserializing using gson
  28. Java GSON: Getting the list of all keys under a JSONObject
  29. Android connection to localhost
  30. Using gson to deserialize specific JSON field of an object

Leave a Comment