library/src/main/java/com/liulishuo/filedownloader/FileDownloader.java
public boolean unBindServiceIfIdle() {
        // check idle
        if (!isServiceConnected()) {
            return false;
        }

        if (FileDownloadList.getImpl().isEmpty()
                && FileDownloadServiceProxy.getImpl().isIdle()) {
            unBindService();
            return true;
        }

        return false;
    }
public boolean unBindServiceIfIdle() {
        // check idle
        if (!isServiceConnected()) {
            return false;
        }

        if (FileDownloadList.getImpl().isEmpty()
                && FileDownloadServiceProxy.getImpl().isIdle()) {
            unBindService();
            return true;
        }

        return false;
    }
Unbind and stop the downloader service when there is no task running in the FileDownloader.

@return {@code true} if unbind and stop the downloader service successfully, {@code false}
there are some tasks running in the FileDownloader.