Android 如何有效地显示进度条？

在我的XML中，我有这个进度条，但在下载结束后，它会旋转。如何将这个进度条与我的下载代码连接起来

   <ProgressBar
    android:id="@+id/progress_bar"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    style="@android:style/Widget.ProgressBar.Large"
    android:layout_alignParentTop="true"
    android:layout_toLeftOf="@+id/button"
    android:layout_toStartOf="@+id/button"
    android:layout_marginTop="153dp" />

---

如果我想显示如下图所示的下载百分比，也可以使用进度条查看此You need ProgressDialog with AsyncTask：查看此You need ProgressDialog with AsyncTask:

   downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);

          Uri uri = Uri.parse(downloadFileUrl);
    DownloadManager.Request request = new DownloadManager.Request(uri);



    nameOfFile = URLUtil.guessFileName(urlChar, null,
            MimeTypeMap.getFileExtensionFromUrl(urlChar));
    Log.e("url char", urlChar);

    request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, nameOfFile);


    request.setVisibleInDownloadsUi(true);   


    myDownloadReference = downloadManager.enqueue(request);
    getProgressPercentaged();
}