public static CallbackContext getCallbackContext(int requestCode) {
        CallbackContext callbackContext = callbackContexts.get(requestCode);

        // Log error, if no context found
        if (callbackContexts == null) {
            Log.e(TAG, "No context found for request code=" + requestCode);
        }

        return callbackContext;
    }
Gets a callback context for a request code or null if not found.
@return CallbackContext or null if not found.
src/android/util/CallbackContextUtil.java