Question

我正在开发一个包含webview的应用程序，在显示的webiste内部有一些pdf，xls和ppt文件，一旦触摸（onclick）就必须下载。现在我怎么做，因为我尝试了一些从stackoverflow接近这里，但没有一个工作。我知道我必须使用下载管理器下载它们，我不需要在我的应用程序中显示它们只是为了下载它们。这是我用来显示我的webview的代码和包含这些文件的其中一个页面的截图。

        //Load webview
            moodleweb = (WebView) findViewById(R.id.moodlewebview);
            moodleweb.setWebViewClient(new WebViewClient());
            WebSettings webSettings = moodleweb.getSettings();
            webSettings.setJavaScriptCanOpenWindowsAutomatically(false);
            moodleweb.loadUrl("http://moodle.ubt-uni.net/");
            webSettings.setJavaScriptEnabled(true);
moodleweb.getSettings().setCacheMode(moodleweb.getSettings().LOAD_DEFAULT);
            moodleweb.getSettings().setAppCacheEnabled(true);
            moodleweb.clearCache(false);
            moodleweb.setWebChromeClient(new WebChromeClient(){

                public void onProgressChanged(WebView view, int progress) {

                    progressBar.setProgress(progress);
                    if(progress == 100) {
                        progressBar.setVisibility(View.GONE);
                    }
                }
            });![enter image description here][2]
            backbutton = (Button) findViewById(R.id.backbutton);  
            backbutton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    if(moodleweb.canGoBack()){
                        moodleweb.goBack();
                    }else{
                        finish();
                    }
                }
            });

enter image description here

编辑2

确定@zepar，我按照你的指示行动得到了这个例外。可能是什么问题：

02-18 12:27:51.943    4972-5424/net.prdev.ubtsmismoodle E/MoodleActivity﹕ 
Exception:
    java.io.FileNotFoundException: /sdcard/downloadedFiels/pluginfile.php?file=%2F23496%2Fmod_resource%2Fcontent%2F1%2FOrari%20i%20transportit%20t%C3%AB%20studenteve%20Prizren%20-%20Prishtin%C3%AB%20dhe%20anasjelltas.pdf: open failed: ENOENT (No such file or directory)
            at libcore.io.IoBridge.open(IoBridge.java:456)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:127)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:116)
            at net.prdev.ubtsmismoodle.MoodleActivity$DownloadTask.doInBackground(MoodleActivity.java:145)
            at net.prdev.ubtsmismoodle.MoodleActivity$DownloadTask.doInBackground(MoodleActivity.java:125)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)
     Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
            at libcore.io.Posix.open(Native Method)
            at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
            at libcore.io.IoBridge.open(IoBridge.java:442)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:127)
            at java.io.FileOutputStream.<init>(FileOutputStream.java:116)
            at net.prdev.ubtsmismoodle.MoodleActivity$DownloadTask.doInBackground(MoodleActivity.java:145)
            at net.prdev.ubtsmismoodle.MoodleActivity$DownloadTask.doInBackground(MoodleActivity.java:125)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)

Answer 1

您可以扩展WebViewClient并覆盖shouldOverrideUrlLoading方法。在该方法中，您可以检查是否要处理请求或将其留给WebView。

see the android documentation

修改

参考下面的评论，这是一个例子：

public class MyWebViewClient extends WebViewClient { @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { if (url.endsWith(".pdf") || url.endsWith(".xls") || url.endsWith(".ppt")) { Log.i(TAG, "download: " + url); // In this place you should handle the download return true; } return super.shouldOverrideUrlLoading(view, url); } }

并将类的实例设置为WebView：

moodleweb.setWebViewClient(new MyWebViewClient()); moodleweb.loadUrl("http://moodle.ubt-uni.net/");

<强> EDIT2

下载文件的最简单方法是使用AsyncTask：

private class DownloadTask extends AsyncTask<String, Void, Void> { @Override protected Void doInBackground(String... sUrl) { InputStream input = null; OutputStream output = null; HttpURLConnection connection = null; try { URL url = new URL(sUrl[0]); String filename = url.getFile(); connection = (HttpURLConnection) url.openConnection(); connection.connect(); if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) { Log.e(TAG, "Server didn't return 200. "); // handle error return null; } input = connection.getInputStream(); output = new FileOutputStream("/sdcard/downloadedFiels/" + filename); // where to save file byte data[] = new byte[4096]; int count; while ((count = input.read(data)) != -1) { if (isCancelled()) { return null; } output.write(data, 0, count); } } catch (Exception e) { // handle error Log.e(TAG, "Exception: ", e); } finally { try { if (output != null) output.close(); if (input != null) input.close(); } catch (IOException e) { Log.e(TAG, "IOException: ", e); } if (connection != null) connection.disconnect(); } return null; } }

要下载文件，你必须以url作为参数执行任务：

new DownloadTask().execute(url);

<强> EDIT3

我猜，这是因为路径不存在或无效。尝试介绍一些变化：首先是文件名，我假设url看起来像这样：http://host/file.pdf不是php的参数。这不是正确的方法，但你可以试试这个：

String filename = URLDecoder.decode(sUrl[0].substring(sUrl[0].lastIndexOf("=")), "UTF-8");

和

// where to save file File file = new File("/sdcard/downloadedFiels/" + filename); file.mkdirs(); output = new FileOutputStream(file);

在android webview中下载文件（pdf，ppt，xls）到没有浏览器的下载文件夹

编辑2

1 个答案: