下载的APK无法打开

Question

我正在使用此代码通过更新按钮下载apk，并希望在下载完成后打开应用。

这是我当前的代码：

DownloadManager downloadmanager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
Uri uri = Uri.parse("https://www.globalgreyebooks.com/content/books/ebooks/game-of-life.apk");

DownloadManager.Request request = new DownloadManager.Request(uri);
//request.setTitle("My File");
//request.setDescription("Downloading");

request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,"game-of.apk");
downloadmanager.enqueue(request);

使用此代码，该应用仍无法打开。它仅在源之后打开。我将如何去做？