library/src/main/java/com/liulishuo/filedownloader/FileDownloader.java
public boolean clear(final int id, final String targetFilePath) {
        pause(id);

        if (FileDownloadServiceProxy.getImpl().clearTaskData(id)) {
            // delete the task data in the filedownloader database successfully or no data with the
            // id in filedownloader database.
            final File intermediateFile = new File(FileDownloadUtils.getTempPath(targetFilePath));
            if (intermediateFile.exists()) {
                //noinspection ResultOfMethodCallIgnored
                intermediateFile.delete();
            }

            final File targetFile = new File(targetFilePath);
            if (targetFile.exists()) {
                //noinspection ResultOfMethodCallIgnored
                targetFile.delete();
            }

            return true;
        }

        return false;
    }
public boolean clear(final int id, final String targetFilePath) {
        pause(id);

        if (FileDownloadServiceProxy.getImpl().clearTaskData(id)) {
            // delete the task data in the filedownloader database successfully or no data with the
            // id in filedownloader database.
            final File intermediateFile = new File(FileDownloadUtils.getTempPath(targetFilePath));
            if (intermediateFile.exists()) {
                //noinspection ResultOfMethodCallIgnored
                intermediateFile.delete();
            }

            final File targetFile = new File(targetFilePath);
            if (targetFile.exists()) {
                //noinspection ResultOfMethodCallIgnored
                targetFile.delete();
            }

            return true;
        }

        return false;
    }
Clear the data with the provided {@code id}.
Normally used to deleting the data in filedownloader database, when it is paused or in
downloading status. If you want to re-download it clearly.
<p/>
<strong>Note:</strong> YOU NO NEED to clear the data when it is already completed downloading
because the data would be deleted when it completed downloading automatically by
FileDownloader.
<p>
If there are tasks with the {@code id} in downloading, will be paused first;
If delete the data with the {@code id} in the filedownloader database successfully, will try
to delete its intermediate downloading file and downloaded file.

@param id             the download {@code id}.
@param targetFilePath the target path.
@return {@code true} if the data with the {@code id} in filedownloader database was deleted,
and tasks with the {@code id} was paused; {@code false} otherwise.