在 Webview 中下载 pdf 不起作用（错误只能下载 HTTP/HTTPS Uri: Blob）

Question

我为我的网站制作了带有 webview 的 android 应用程序，但是当我尝试下载 pdf 文件时，我总是收到错误 java.lang.IllegalArgumentException: Can only download HTTP/HTTPS URIs: blob:http://lapor.infokanimsambas.com/a0d3f9a5-81ce-434d-99a3-52ae66348ea2 我正在使用下载监听器，这是我的代码：

@SuppressLint({"SetJavaScriptEnabled", "WrongViewCast"})
@Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    webView = (WebView) findViewById(R.id.os_view);
    assert webView != null;
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setAllowFileAccess(true);

    if(Build.VERSION.SDK_INT >= 21){
        webSettings.setMixedContentMode(0);
        webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
    }else {
        webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
    }

    webView.setWebViewClient(new Callback());
    webView.loadUrl(webview_url);
    webView.setDownloadListener(new DownloadListener() {
        @Override
        public void onDownloadStart(String url, String userAgent, String contentDisposition, String mimetype, long contentLength) {
            DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
            request.setMimeType(mimetype);
            String cookies = CookieManager.getInstance().getCookie(url);
            request.addRequestHeader("cookie", cookies);
            request.addRequestHeader("User-Agent", userAgent);
            request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimetype));
            request.allowScanningByMediaScanner();
            request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
            request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
                    url, contentDisposition, mimetype));
            DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
            dm.enqueue(request);
            Toast.makeText(getApplicationContext(), "Downloading FIle", Toast.LENGTH_LONG).show();
        }
    });

这是错误日志：

2021-04-15 09:13:16.790 6870-6870/mgks.os.fileup E/AndroidRuntime: FATAL EXCEPTION: main
Process: mgks.os.fileup, PID: 6870
java.lang.IllegalArgumentException: Can only download HTTP/HTTPS URIs: blob:http://lapor.infokanimsambas.com/a0d3f9a5-81ce-434d-99a3-52ae66348ea2
    at android.app.DownloadManager$Request.<init>(DownloadManager.java:468)
    at mgks.os.fileup.MainActivity$1.onDownloadStart(MainActivity.java:149)
    at Cs.handleMessage(chromium-TrichromeWebViewGoogle.apk-stable-410410681:156)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7656)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

谁能帮帮我？？？

Answer 1

除了使用 webview 之外，您还可以使用操作视图意图直接跳转到浏览器并在其中传递 url，或者您可以尝试 volley 库