public static void sendLoadProgressDetail(@Nullable final Handler handler, @StringRes final int resourceId) {
        if (handler != null) {
            handler.obtainMessage(UPDATE_LOAD_PROGRESS_DETAIL, CgeoApplication.getInstance().getString(resourceId)).sendToTarget();
        }
    }
Check if a handler has been disposed.

@param handler a handler, or null
@return true if the handler is not null and has been disposed
main/src/main/java/cgeo/geocaching/utils/DisposableHandler.java