java - Android Webview 应用程序无法下载图像

Question

我有一个带有下载按钮的 Webview Android 应用程序，该应用程序尝试从 S3 存储桶下载图像。大约半年前，一切正常，但突然就停止工作了。如果我转到网站的浏览器变体，一切仍然有效。所以我认为这与应用程序有关。

我有一个 addDownloadListener 并添加到 Android list 中。

下面是我的 addDownloadListener:

私有(private)无效addDownloadListener() { TurbolinksSession.getDefault(此) . Activity (这个) .适配器(这个) .view(turbolinksView) .getWebView() .setDownloadListener(new DownloadListener() {

        @Override
        public void onDownloadStart(String url, String userAgent,
                                    String contentDisposition, String mimeType,
                                    long contentLength) {

            String filename = URLUtil.guessFileName(url, contentDisposition, mimeType);
            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));

            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
            dm.enqueue(request);
            Toast.makeText(getApplicationContext(), "Download is gestart", //To notify the Client that the file is being downloaded
                    Toast.LENGTH_LONG).show();

        }
    });
}

当我单击链接时，这是日志猫中的输出:

E: [] mConsumerName == NULL!!!!!!2019-05-10 11:00:53.606 ? E:onTransact中代码为:103

2019-05-10 10:45:51.840 ？ E: win=Window{104d4cf u0 com.app.name.here.MainActivity} destroySurfaces: appStopped=true win.mWindowRemovalAllowed=false win.mRemoveOnExit=false

Answer 1

出于某种原因，我不知道 addDownloadListener 从未被激活，所以这就是它从未下载图像的原因。所以我做了一个解决办法。在 MainActivity 中，我有这个函数:visitProposeToLocationWithAction，它检查应用程序发出的新请求是否保留在我们的 web View 中。因此，我在该函数中使用以下几行创建了 if else 语句:

public void visitProposedToLocationWithAction(String location, String action) {
    if(location.contains(AMAZON_URL)) {

        String url = location;
        DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));



        request.allowScanningByMediaScanner();
        request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
        request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "Downloads");
        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        dm.enqueue(request);
        Toast.makeText(getApplicationContext(), "Download is gestart", //To notify the Client that the file is being downloaded
                Toast.LENGTH_LONG).show();

    } else {
        Intent intent = new Intent(this, MainActivity.class);
        intent.putExtra(INTENT_URL, location);
        this.startActivity(intent);
    }
}

所以现在当我向保存图像的位置发出请求时，它会下载它们。