如何使用下载管理器网页视图下载PDF / PPT / DOC文件到SD卡 [英] How to use a download Manager in a webview to download pdf/ppt/doc files to sdcard
问题描述
我的工作，它使用网页视图中打开我的网站（网址：learnportal.me）一个Android应用程序，然后在进入正确的凭据，它会加载其中有多个下载链接（这些普通的HTML页面都是PDF / PPT / DOC文件）。结果
所有这一切都发生在web视图中。
我要的是下载，直接在应用程序中发生的，没有任何重定向到移动设备默认的Web浏览器。
进一步，我所需要的文件被下载到SD卡
这是在MainActivity页我目前工作的......不知道它的正确的，虽然
公共类MainActivity延伸活动{
@燮pressWarnings（德precation）
@燮pressLint（SetJavaScriptEnabled）
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的WebView的WebView =新的WebView（本）;
webview.setWebChromeClient（新WebChromeClient（））;
WebViewClient客户端=新ChildBrowserClient（）;
webview.setWebViewClient（客户端）;
WebSettings设置= webview.getSettings（）;
settings.setJavaScriptEnabled（真）;
//webview.setInitialScale(1）;
//webview.getSettings().setUseWideViewPort(true）;
settings.setJavaScriptCanOpenWindowsAutomatically（假）;
//settings.setBuiltInZoomControls(true）;
settings.setPluginState（PluginState.ON）;
settings.setDomStorageEnabled（真）;
webview.loadUrl（http://learnportal.me）;
//webview.setId(5）;
//webview.setInitialScale(0）;
//webview.requestFocus（）;
// webview.requestFocusFromTouch（）;
的setContentView（web视图）;
}
/ **
*本网页流量的客户端接收有关APPVIEW通知
* /
公共类ChildBrowserClient扩展WebViewClient {
@燮pressLint（{InlinedApi，NewApi}）
@覆盖
公共布尔shouldOverrideUrlLoading（的WebView视图，字符串URL）{
布尔值= TRUE;
字符串延长= MimeTypeMap.getFileExtensionFromUrl（URL）;
如果（延伸！= NULL）{
MimeTypeMap哑剧= MimeTypeMap.getSingleton（）;
字符串mime类型= mime.getMimeTypeFromExtension（扩展）;
如果（mime类型！= NULL）{
如果（mimeType.toLowerCase（）。包含（PPTX）
|| extension.toLowerCase（）。包含（PDF）
|| extension.toLowerCase（）。包含（DOC）
|| extension.toLowerCase（）。包含（PPT））{
下载管理器mdDownloadManager =（下载管理器）MainActivity.this
.getSystemService（Context.DOWNLOAD_SERVICE）;
DownloadManager.Request要求=新DownloadManager.Request（
Uri.parse（URL））;
文件destinationFile =新的文件（Environment.getExternalStorageDirectory（）的getFileName（URL））;
request.setAllowedNetworkTypes（DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE）;
request.setDescription（通过LearnPortal下载..）;
request.setNotificationVisibility（DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED）;
request.setDestinationUri（Uri.fromFile（destinationFile））;
mdDownloadManager.enqueue（请求）;
值= FALSE;
}
}
如果（值）{
view.loadUrl（URL）;
}
}
返回值;
}
@覆盖
公共无效onPageFinished（的WebView视图，字符串URL）{
super.onPageFinished（查看，网址）;
}
/ **
*通知页面已经开始加载主机应用程序。
*
* @参数视图
* web视图开始回调。
* @参数网址
*该网页的网址。
* /
@覆盖
公共无效onPageStarted（的WebView视图，字符串URL，位图图标）{
super.onPageStarted（查看，网址，图标）;
}
}
/ **
*文件的URL名称
*
* @参数网址
* @返回
* /
公众的getFileName字符串（字符串URL）{
串filenameWithoutExtension =;
filenameWithoutExtension =将String.valueOf（System.currentTimeMillis的（））;
返回filenameWithoutExtension;
}
}
HTTP： //developer.android.com/reference/android/webkit/DownloadListener.html
使用DownloadListener并覆盖onDownloadStart
实际下载逻辑检查onDownloadStartNoStream在下面的链接
<一个href=\"https://android.googlesource.com/platform/packages/apps/Browser/+/android-4.4_r1.1/src/com/android/browser/DownloadHandler.java\" rel=\"nofollow\">https://android.googlesource.com/platform/packages/apps/Browser/+/android-4.4_r1.1/src/com/android/browser/DownloadHandler.java
I'm working on an android application which uses a webview to open my site (url: learnportal.me) and then, upon entering the correct credentials, it will load a normal html page which has multiple links to download (those are all pdf/ppt/doc files).
All of this happens inside the webview.
All I want is the downloads to happen directly within the application itself, without any redirection to the default web browser in the mobile device.
Further more, I need the files to be downloaded to the SD card.
This is the MainActivity Page I'm currently working on... not sure if its correct though
public class MainActivity extends Activity {
@SuppressWarnings("deprecation")
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView webview = new WebView(this);
webview.setWebChromeClient(new WebChromeClient());
WebViewClient client = new ChildBrowserClient();
webview.setWebViewClient(client);
WebSettings settings = webview.getSettings();
settings.setJavaScriptEnabled(true);
//webview.setInitialScale(1);
//webview.getSettings().setUseWideViewPort(true);
settings.setJavaScriptCanOpenWindowsAutomatically(false);
//settings.setBuiltInZoomControls(true);
settings.setPluginState(PluginState.ON);
settings.setDomStorageEnabled(true);
webview.loadUrl("http://learnportal.me");
//webview.setId(5);
//webview.setInitialScale(0);
//webview.requestFocus();
// webview.requestFocusFromTouch();
setContentView(webview);
}
/**
* The webview client receives notifications about appView
*/
public class ChildBrowserClient extends WebViewClient {
@SuppressLint({ "InlinedApi", "NewApi" })
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
boolean value = true;
String extension = MimeTypeMap.getFileExtensionFromUrl(url);
if (extension != null) {
MimeTypeMap mime = MimeTypeMap.getSingleton();
String mimeType = mime.getMimeTypeFromExtension(extension);
if (mimeType != null) {
if (mimeType.toLowerCase().contains("pptx")
|| extension.toLowerCase().contains("pdf")
|| extension.toLowerCase().contains("doc")
|| extension.toLowerCase().contains("ppt")){
DownloadManager mdDownloadManager = (DownloadManager) MainActivity.this
.getSystemService(Context.DOWNLOAD_SERVICE);
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(url));
File destinationFile = new File(Environment.getExternalStorageDirectory(),getFileName(url));
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
request.setDescription("Downloading via LearnPortal..");
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setDestinationUri(Uri.fromFile(destinationFile));
mdDownloadManager.enqueue(request);
value = false;
}
}
if (value) {
view.loadUrl(url);
}
}
return value;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
/**
* Notify the host application that a page has started loading.
*
* @param view
* The webview initiating the callback.
* @param url
* The url of the page.
*/
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
}
/**
* File name from URL
*
* @param url
* @return
*/
public String getFileName(String url) {
String filenameWithoutExtension = "";
filenameWithoutExtension = String.valueOf(System.currentTimeMillis());
return filenameWithoutExtension;
}
}
http://developer.android.com/reference/android/webkit/DownloadListener.html
use DownloadListener and override onDownloadStart
for the actual download logic check onDownloadStartNoStream in the below link
这篇关于如何使用下载管理器网页视图下载PDF / PPT / DOC文件到SD卡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！
