Android JSON parse multiple objects

Question

I have JSON as such:

{
  "Temperature": {
    "Name": "Temperature",
    "Value": "26.19",
    "Unit": "C"
  },
  "Humidity": {
    "Name": "Humidity",
    "Value": "29.38%",
    "Unit": "%"
  }
}

and I want to save it into List of objects of same type. Here is my class:

public class Measurement {
    private String name;
    private String value;
    private String unit;

    public Measurement(String name, String value, String unit){
        this.name = name;
        this.value = value;
        this.unit = unit;
    }

    public String getName() {
        return name;
    }

    public String getValue() {
        return value;
    }

    public String getUnit() {
        return unit;
    }

    @Override
    public String toString(){
        return name + " = " + value + unit;
    }
}

I have tried it usng gson like this:

Type measurementListType = new TypeToken<ArrayList<Measurement>>(){}.getType();

List<Measurement> msm = new Gson().fromJson(json, measurementListType);

but that gives error

Expected BEGIN_ARRAY but was BEGIN_OBJECT

Provided JSON is just an example, it could have any number of objects, but they would all have to follow same structure. How can I parse them into List? Any help is greatly appreciated.

Vitor M. Barbosa · Accepted Answer · 2018-03-05 21:35:31Z

1

For that JSON you're showing to be an array of objects, it needs to be sorrounded by square brackets, like this:

[{
    "Temperature": {
        "Name": "Temperature",
        "Value": "26.19",
        "Unit": "C"
    },
    "Humidity": {
        "Name": "Humidity",
        "Value": "29.38%",
        "Unit": "%"
    }
}]

From there you can have one or multiple objects inside the array.

answered Mar 5, 2018 at 21:35

Vitor M. Barbosa

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1 Comment

somik07 Over a year ago

So I changed JSON format to [ { "Name": "Temperature", "Value": "26.19", "Unit": "C" }, { "Name": "Humidity", "Value": "29.38%", "Unit": "%" } ] and it worked. I will accept your answer as it helped me understand what was wrong. Thank you.

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