Android 如何使用“确定”按钮显示下载完整弹出窗口

我在Android Studio中使用webView制作了应用程序，我的应用程序包含所有图像，因此我在应用程序中也实现了下载按钮，但当有人单击下载按钮时，它只是下载图像，我想在下载完成时显示弹出窗口，类似这样的情况， 下载完成并在“确定”按钮下方

这是我的下载代码

 Uri source = Uri.parse(url);
                // Make a new request pointing to the .apk url
                DownloadManager.Request request = new DownloadManager.Request(source);
                // appears the same in Notification bar while downloading
                request.setDescription("Description for the DownloadManager Bar");
                request.setTitle("PunjabiDharti.jpg");
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
                    request.allowScanningByMediaScanner();
                    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                }
                // save the file in the "Downloads" folder of SDCARD
                request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "PunjabiDharti.jpg");
                // get download service and enqueue file
                DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
                manager.enqueue(request);

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如何显示弹出窗口？

首先，在build.gradle中添加MaterialDialog的依赖项

创建广播接收器处理程序

现在注册接收机

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谢谢先生，它的作品：XD现在我可以显示插页广告后点击确定？

dependencies {
    // ... other dependencies here
    implementation 'com.afollestad.material-dialogs:core:0.9.6.0'
}

BroadcastReceiver downloadListener = new BroadcastReceiver(){
    public void onReceive(Context ct, Intent intent){
        new MaterialDialog.Builder(this)
              .title("Download Completed")
              .content("Download Successfully Completed")
              .positiveText("OK")
              .show();
    }
};

registerReceiver(downloadListener, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));