JsonUtils, JSON parsing made easy. Simply pass the json object and the path to the key you want, and it will return value if available, otherwise it will return null. Works well with simple JSONObject and Gson's JsonObject.

JsonUtils.java

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.Iterator;
import java.util.Map;

public class JsonUtils {

    /**
     * get value for key
     *
     * @param jsonObject jsonObject
     * @param key        key for value. for inner object key must be followed by parent and period "."
     *                   for ex: {"name": {"firstName": { ... } } } name.firstName
     * @return JsonElement (JsonObject or JsonArray)
     */
    public static JsonElement getJsonObjectForKey(JsonObject jsonObject, String key) {
        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
            String keyName = entry.getKey();

            if (key.contains(keyName)) {
                if (key.contains(".")) {
                    String newKey = key.substring(key.indexOf(".") + 1);
                    if (entry.getValue() instanceof JsonObject) {
                        return getJsonObjectForKey((JsonObject) entry.getValue(), newKey);
                    }
                } else {
                    return entry.getValue();
                }
            }
        }
        return null;
    }

    public static Object getJsonObjectForKey(JSONObject jsonObject, String key) {

        Iterator iterator = jsonObject.keys();

        while (iterator.hasNext()) {
            // get key
            String keyName = (String) iterator.next();
            // get value of that key
            try {
                Object object = jsonObject.get(keyName);
                if (key.contains(keyName)) {
                    if (key.contains(".")) {
                        String newKey = key.substring(key.indexOf(".") + 1);
                        if (object instanceof JSONObject) {
                            return getJsonObjectForKey((JSONObject) object, newKey);
                        }
                    } else {
                        return object;
                    }
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

Assuming that any key doesn't contain dot "."