Java – Store JSON objects in a HashMap

I’m below jsonResponse.

In each response, the key and value change.

I want to store count and previousCountDay, keys and values in HashMap.

JSON response:

{
    "count": {
        "2018-03-28 18": 55,
        "2018-03-28 19": 48,
        "2018-03-28 20": 41,
        "2018-03-28 21": 31,
        "2018-03-28 22": 32,
        "2018-03-28 23": 26,
        "2018-03-29 00": 20,
        "2018-03-29 01": 16,
        "2018-03-29 02": 12,
        "2018-03-29 03": 0
    },
    "previousCountDay": {
        "2018-03-27 18": 40,
        "2018-03-27 19": 59,
        "2018-03-27 20": 53,
        "2018-03-27 21": 48,
        "2018-03-27 22": 36,
        "2018-03-27 23": 40,
        "2018-03-28 00": 37,
        "2018-03-28 01": 14,
        "2018-03-28 02": 29,
        "2018-03-28 03": 1
    }, 
    "noOfIntervals": 10,
    "range": [
        "18",
        "19",
        "20",
        "21",
        "22",
        "23",
        "00",
        "01",
        "02",
        "03"
    ]
}

By using GSON, I get the JSON

response, but I only store the range because it comes from the JSON array, and with the range I get the size of the count & previousCountDay.

Here is my Activity class:

 private void JsonRequestOrderVelocity(String dmhw) {
    utils.showDialog();

String url = Constants.VELOCITY_API;
    Log.e("URL", "" + url);

JsonObjectRequest request = new JsonObjectRequest(url, null,
            response -> {
                Log.e("onResponse",""+response);
                try {
                    Gson gson = new Gson();
                    Type listType = new TypeToken<OrderVelocityPojo>() {
                    }.getType();

orderVelocityPojo = gson.fromJson(response.toString(), listType);

Log.e("SIZE",""+orderVelocityPojo.getRange().size());

JSONObject object = response.getJSONObject("count");

Map<String, Integer> countMap = new HashMap<String, Integer>();

store keys and values in HashMap.
                    for(int i=0; i<orderVelocityPojo.getRange().size(); i++){

countMap.put( ); 

}

} catch (Exception e) {
                    Log.e("Exception",""+e);
                    utils.hideDialog();
                    e.printStackTrace();

}
                utils.hideDialog();

}, error -> {

Log.e("error",""+error.getMessage());
        utils.hideDialog();
    });
    request.setRetryPolicy(new DefaultRetryPolicy(
            MY_SOCKET_TIMEOUT_MS,
            DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    AppController.getInstance(this).addToRequestQueue(request);
}

OrderVelocityPojo Pojo class:

import java.util.List;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class OrderVelocityPojo {

@SerializedName("noOfIntervals")
    @Expose
    private Integer noOfIntervals;

@SerializedName("range")
    @Expose
    private List<String> range = null; 

public Integer getNoOfIntervals() {
        return noOfIntervals;
    }

public void setNoOfIntervals(Integer noOfIntervals) {
        this.noOfIntervals = noOfIntervals;
    }

public List<String> getRange() {
        return range;
    }

public void setRange(List<String> range) {
        this.range = range;
    }
}

You can use Gson’s library for this.
You can try converting a JSON object to a hashmap. Here, you’ll provide typeToken as your json type value.

Map<String, Object> hashmap = new Gson().fromJson(
    jsonString, new TypeToken<HashMap<String, Object>>() {}.getType()
);