{
  "employee_id": 1001,
  "name": "Abhishek",
}

build.gradle
compile 'com.android.volley:volley:1.0.0'

MySingleton.class
import android.content.Context;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;

public class MySingleton {

    private static MySingleton mInstance;
    private RequestQueue mRequestQueue;
    private static Context mCtx;

    private MySingleton(Context context) {
        mCtx = context;
        mRequestQueue = getRequestQueue();
    }

    public static synchronized MySingleton getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new MySingleton(context);
        }
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            // getApplicationContext() is key, it keeps you from leaking the
            // Activity or BroadcastReceiver if someone passes one in.
            mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req) {
        getRequestQueue().add(req);
    }

}

MainActivity.class
private void loadJsonObj() {
JsonObjectRequest jsObjRequest = new JsonObjectRequest
			(Request.Method.GET, obj_url, null, new Response.Listener<JSONObject>() {

				@Override
				public void onResponse(JSONObject response) {
					pDialog.dismiss();
					try {
						//Parse the JSON response
						Integer employeeId = response.getInt(KEY_EMPLOYEE_ID);
						String name = response.getString(KEY_NAME);

						//Create String out of the Parsed JSON
						StringBuilder textViewData = new StringBuilder().append("Employee Id: ")
								.append(employeeId.toString()).append(NEW_LINE);
						textViewData.append("Name: ").append(name).append(NEW_LINE);

						//Populate textView with the response
						mTxtDisplay.setText(textViewData.toString());

					} catch (JSONException e) {
						e.printStackTrace();
					}
				}
			}, new Response.ErrorListener() {

				@Override
				public void onErrorResponse(VolleyError error) {
					pDialog.dismiss();

					//Display error message whenever an error occurs
					Toast.makeText(getApplicationContext(),
							error.getMessage(), Toast.LENGTH_SHORT).show();
				}
			});

	// Access the RequestQueue through your singleton class.
	MySingleton.getInstance(this).addToRequestQueue(jsObjRequest);
}