This document discusses JSON parsing with GSON in Android. It introduces JSON and XML data formats, JSON objects and arrays, and different JSON data types. It then explains how to parse JSON with a JSONObject parser or use GSON for parsing. GSON allows parsing JSON into POJO models using annotations and parsing JSON arrays into collections. It also supports features like date formatting. The document ends by providing a GitHub link for a GSON demo project.

1. Android Developer
GSON
- Andyang

2. JSON
{
"employees": [
{
"firstName": "John",
"lastName": "Doe"
},
{
"firstName": "Anna",
"lastName": "Smith"
}
]
}

3. XML
<employees>
<employee>
<firstName>John</firstName>
<lastName>Doe</lastName>
</employee>
<employee>
<firstName>Anna</firstName>
<lastName>Smith</lastName>
</employee>
</employees>

4. JSON Object & Array
JSON Object {}
JSON Array[]
Key Value pairs "firstName": "John"

5. JSON Data Types
String "name": "Andy"
Boolean “hasMoney": false
int “age": 26
float “height”: 176.1

6. JSON Object Parser
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = new JSONArray(json);
for (int i = 0;sizeOfJSON; i++) {
jsonObject.get("key");
jsonArray.get(i);
………
}

7. How about GSON
Model First
public class Employees {
@SerializedName("firstName") String firstName;
@SerializedName("firstName") String lastName;
geter
setter
….
}

8. JSON Parser
Gson gson = new Gson();
Employees employees = gson.fromJson(json,
Employees.class);

9. GSON Collection Parser
Gson gson = new Gson();
Type type = new
TypeToken<List<Employees>>(){}.getType();
List<Employees> employees
= gson.fromJson(json, type);

10. Powerful Paser
Date fotmat parser
Gson gson = new
GsonBuilder().setDateFormat("yyyy/MM/dd
HH:mm:ss”).create();

11. Live Demo

12. GITHUB
https://github.com/bng86/GsonDemo