使用下载管理器类，从的WebView下载文件 [英] Use DownloadManager class to download file from WebView
问题描述
我这个小code这里的时候，点击的WebView链接是一个链接到一个文件，在这种情况下.MP4。这code将进入默认的Web浏览器，并请求应用程序，可以查看此文件类型。
I have this little code here when click a link on webview that is a link to a file, in this case .mp4. this code will go to default web browser and request app that can view this file type.
myWebView.setDownloadListener(new DownloadListener() {
public void onDownloadStart(String url, String userAgent,
String contentDisposition, String mimetype,
long contentLength) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}
});
我要的是当我点击该文件链接，它创建要求气象下载或查看文件的对话框。如果点击下载，我想使用下载管理器类来处理它，并下载该文件的背景和警报完成时。如果单击视图，我想创建意图索要应用程序，可以不用去的Web浏览器查看此文件。
What i want is when i click that file link, it create a dialog that ask weather to download or view the file. If click download, i want to use DownloadManager class to handle it and download that file in the background and alert when completed. And if click view, i want to create intent that ask for app that can view this file without going to the web browser.
private class MyWebViewClient extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(WebView view, final String url) {
if (url.endsWith(".mp4")) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage(R.string.dialog_title)
.setCancelable(false)
.setPositiveButton(R.string.dialog_download, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setDescription("Some descrition");
request.setTitle("Some title");
// in order for this if to run, you must use the android 3.2 to compile your app
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "name-of-the-file.ext");
// get download service and enqueue file
DownloadManager manager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
})
.setNegativeButton(R.string.dialog_play, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
WebView myWebView = (WebView) findViewById(R.id.webview);
myWebView.setDownloadListener(new DownloadListener() {
public void onDownloadStart(String url, String userAgent,
String contentDisposition, String mimetype,
long contentLength) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.parse(url), "video/mp4");
startActivity(intent);
}
});
}
});
AlertDialog alert = builder.create();
alert.show();
}
return false;
}
}
现在我得到这个code，提示用户下载或播放，用户点击的MP4文件。但是当我点击播放或下载这是工作，直到我点击链接的第二次，有什么不对的code以上，如果任何人都可以解决此请。谢谢。
Now i got this code that prompt user to download or play mp4 file that the user clicked. But when i click Play or Download it is work until i click the link the second time, what's wrong with the code above if anyone can correct this please. thanks.
我很新至Android开发和Java中，如果任何人都可以指导我通过这个它会帮助我学得更快。而且也对不起我的英语水平...
I'm very new to Android developing and java, if anyone could guide me through this it will help me learn faster. And also sorry for my English...
推荐答案
该问题的解决方案依赖于拦截你的WebView试图加载的URL。创建 WebViewClient 并覆盖shouldOverrideUrlLoading方式：
The solution to your problem relies on intercepting the URL that your webview is trying to load. Create a WebViewClient and overwrite the shouldOverrideUrlLoading method:
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.endsWith(".mp3")) { //or whatever other extension
//Prompt user for action (save or view)
}
return false;
}
然后，根据用户选择什么，启动一个<一href="http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog">AsyncTask下载处理下载文件，或启动的意图进行查看。
Then, depending on what the user chooses, start an AsyncTask for downloading to handle downloading the file, or launch the intent for viewing.
这篇关于使用下载管理器类，从的WebView下载文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
