A Google Volley request subclass to post and get objects parsed using Jackson Basically the same as https://android.googlesource.com/platform/frameworks/volley/+/master/src/com/android/volley/toolbox/JsonRequest.java with Jackson mapping

JacksonJsonRequest.java

import com.android.volley.NetworkResponse;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyLog;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.IOException;

public abstract class JacksonJsonRequest<T> extends Request<T> {

    private ObjectMapper mMapper = new ObjectMapper();

    private static final String PROTOCOL_CHARSET = "utf-8";


    private static final String PROTOCOL_CONTENT_TYPE =
            String.format("application/json; charset=%s", PROTOCOL_CHARSET);

    private final Response.Listener<T> mListener;
    private final T mRequestBody;
    private final Class<T> mClass;

    public JacksonJsonRequest(int method, String url,  T requestBody, Response.Listener<T> listener, 
    	Response.ErrorListener errorListener, Class<T> claz){
        super(method, url, errorListener);

        mListener = listener;
        mRequestBody = requestBody;
        mClass = claz;
    }

    public JacksonJsonRequest(int method, String url,  T requestBody, Response.Listener<T> listener,
                              Response.ErrorListener errorListener, Class<T> claz, ObjectMapper objectMapper){
        this(method, url, requestBody, listener, errorListener, claz);

        mMapper = objectMapper;
    }

    @Override
    protected  Response<T> parseNetworkResponse(NetworkResponse response){
        String jsonString = new String(response.data);
        try {
            T result = mMapper.readValue(jsonString, mClass);
            return Response.success(result, getCacheEntry());
        } catch (IOException e) {
            VolleyLog.d("IOException mapping the json string %s",
                    jsonString);
        }
        return null;
    }

    @Override
    protected void deliverResponse(T response) {
        mListener.onResponse(response);
    }

    @Override
    public String getBodyContentType() {
        return PROTOCOL_CONTENT_TYPE;
    }

    @Override
    public byte[] getBody()  {
        try {
            return mRequestBody == null ? null : mMapper.writeValueAsBytes(mRequestBody);
        } catch (JsonProcessingException e) {
            VolleyLog.wtf("JsonProcessing exception while trying to get the bytes of %s using %s",
                    mRequestBody, PROTOCOL_CHARSET);
        }
        return null;
    }
}