添加依赖

build.gradle

 //Gson解析
implementation 'com.squareup.retrofit2:converter-gson:2.0.2'

通过Gson将Json字符串转对象

String prames = "{'name':'大哥'，'age':'30'}"
JsonObject jsonObject = new JsonParser().parse(prames).getAsJsonObject();
String name = jsonObject.get("name").getAsString();
String age = jsonObject.get("age").getAsString();

通过Gson将Json对象转字符串

 Map<String,String> map = new HashMap<String, String>();
 map.put("name","大哥");
 map.put("age","122");
String jsonString = new Gson().toJson(map);