将单个 Json object 作为字符串返回

Question

I am trying to pass a single object:key-value as a JSON response. How to add a single JSON object and return it as a String:

{

"flag":"true"

}

Answer 1

You may try below code

try {
     JSONObject jsonObject = new JSONObject("{\"flag\":\"true\"}");
jsonObject.toString()
}catch (JSONException err){
     Log.d("Error", err.toString());
}

Answer 2

You can try using Maven Jackson databind dependency

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.5</version>
    </dependency>
   // Create a map for your key value json   
    Map<String,String> obj = new HashMap();
    obj.put("flag","true");
    ObjectMapper objectMapper = new ObjectMapper();
    // Convert object into string
    String output = objectMapper.writeValueAsString(obj);
    return output;