I have created a web browser using webview in android. My aim is to control the content of the webview before it is loaded. Whenever the content of the webview makes a request to any domain server, it has to pass through shoulInterceptRequest(). If the url is pointing to any video uploading sites(youtube.com, vimeo.com), I can change it to some Access Denied url so that video will not be loaded.
#Override
public WebResourceResponse shouldInterceptRequest(final WebView view, String url) {
try {
if (access.permission(url)) {
return super.shouldInterceptRequest(view, url);
}
} catch (Exception e) {
e.printStackTrace();
}
return getResponseData();
}
private WebResourceResponse getResponseData() {
try {
String str = "Access Denied";
InputStream data = new ByteArrayInputStream(str.getBytes("UTF-8"));
return new WebResourceResponse("text/css", "UTF-8", data);
} catch (IOException e) {
return null;
}
}
But shoulInterceptRequest() is availabe from API 11. I NEED it to work from API 8.
Is there any alternative way to implement it ? I need to block the url if it is potinting to any video uploading sites BEFORE LOADING ANY DATA.
How about using the http://developer.android.com/reference/android/webkit/WebViewClient.html#shouldOverrideUrlLoading(android.webkit.WebView, java.lang.String) event?
You can block the url and then call http://developer.android.com/reference/android/webkit/WebView.html#loadUrl(java.lang.String) to show anything you want (and even run arbitrary javascript with the "javascript:do_something()" notation)
Related
I am working on a project right now where I use jsoup in a class with the function retrieveMedia in order to return an ArrayList filled with data from the webpage. I run it in a thread since you shouldn't be connecting to URLs from the main thread. I run it and join it. However, it doesn't work (I tested the same code in Eclipse separate from Android Studio and it worked fine). It seems that no matter what I do I can't get jsoup to connect to the webpage. Below is my class MediaRetriever.
public class MediaRetreiever {
public ArrayList<Media> retrieveMedia() {
ArrayList<Media> mediaOutput = new ArrayList<Media>(); //Store each scraped post
Thread downloadThread = new Thread(new Runnable() {
public void run() {
Document doc = null;
try {
doc = Jsoup.connect(<Website Im connecting to>).timeout(20000).get();
} catch (IOException e) {
System.out.println("Failed to connect to webpage.");
mediaOutput.add(new Media("Failed to connect", "oops", "", "oh well"));
return;
}
Elements mediaFeed = doc.getElementById("main").getElementsByClass("node");
for (Element e : mediaFeed) {
String title, author, imageUrl, content;
title=e.getElementsByClass("title").text().trim();
author=e.getElementsByClass("content").tagName("p").select("em").text().trim();
content=e.getElementsByClass("content").text().replace(author,"").trim();
Media media = new Media(title, author, "", content);
mediaOutput.add(media);
}
}
});
downloadThread.start();
try {
downloadThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
return mediaOutput;
}
}
Running this class's method from another class and it doesn't ever connect. Any ideas?
Since you say that the problem persists only in Android, it looks like that you should add the user agent string to your request - first get the user agent string of a browser that displays correctly the site, and then add it to the request:
doc = Jsoup.connect(<Website Im connecting to>)
.userAgent("your-user-agent-string")
.timeout(20000).get();
And as a sidenote - if you are catching exception, don't print your own error message - print the original message, it may be very useful.
I have pdf file stored on my firebase storage, and its link in firebase real-time database, how can I open it inside my android app (android studio, JAVA). Not using INTENT , but directly inside my app.
You can use android-pdfView, see this blog post.
It demonstrates the basic usage of the library to display pdf onto the view with vertical and horizontal swipe.
pdfView = (PDFView) findViewById(R.id.pdfView);
pdfView.fromFile(new File("/storage/sdcard0/Download/pdf.pdf")).defaultPage(1).enableSwipe(true).onPageChange(this).load();
There are also other libraries like Android PDF Viewer,
VuDroid etc.
Also Android API 19 provides feasibility now to present pdf content inside an app and thus no need of 3rd party SDKs.
you can find details here.
If you want to load the file using a URL then you can use a webview.
WebView webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
String pdf = "http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf";
webview.loadUrl("http://docs.google.com/gview?embedded=true&url=" + pdf);
Found the answer with little research :-
no need of webview or Intent which opens another app
Library :-
implementation 'com.github.barteksc:android-pdf-viewer:2.8.2'
xml code :-
<com.github.barteksc.pdfviewer.PDFView
android:visibility="visible"
android:id="#+id/pdfView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
JAVA code :-
{
String pdfurl="firebase_access_token_of_pdf_file";
pdfView = (PDFView) findViewById(R.id.pdfView);
new RetrivePDFfromUrl().execute(pdfUrl);
}
// create an async task class for loading pdf file from URL.
class RetrivePDFfromUrl extends AsyncTask<String, Void, InputStream> {
#Override
protected InputStream doInBackground(String... strings) {
// we are using inputstream
// for getting out PDF.
InputStream inputStream = null;
try {
URL url = new URL(strings[0]);
// below is the step where we are
// creating our connection.
HttpURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
if (urlConnection.getResponseCode() == 200) {
// response is success.
// we are getting input stream from url
// and storing it in our variable.
inputStream = new BufferedInputStream(urlConnection.getInputStream());
}
} catch (IOException e) {
// this is the method
// to handle errors.
e.printStackTrace();
return null;
}
return inputStream;
}
#Override
protected void onPostExecute(InputStream inputStream) {
// after the execution of our async
// task we are loading our pdf in our pdf view.
pdfView.fromStream(inputStream).load();
}
}
}
I'm developing a stream video app in Android with MediaPlayer. The problem is that I need to show the current bitrate, but I haven't found any valid suggestions on how to do get it?
Here is how I'm setting the video url to play:
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(VIDEO_PATH);
mediaPlayer.prepare();
mediaPlayer.init();
} catch (IOException e) {
e.printStackTrace();
}
I don't know if the only way to get that working is using ExoPlayer (which I've read it may be possible)
Any suggestions?
Thanks!
Apparently you cannot do this with MediaPlayer but you can use MediaMetadataRetriever, which is available since API level 10, i.e., quite a while ago.
int getBitRate(String url) {
final MediaMetadataRetriever mmr = new MediaMetadataRetriever();
try {
mmr.setDataSource(url, Collections.EMPTY_MAP);
return Integer.parseInt(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_BITRATE));
} catch (NumberFormatException e) {
return 0;
} finally {
mmr.release();
}
}
The disadvantage this can have is that you will make an extra HTTP request for getting the metadata (only an RTT if you are streaming from an URI; if you are reading from an file descriptor it could be more serious). Hopefully no big deal.
I'm using Flying Saucer to create a pdf from xhtml, hosted on a tomcat server. Most of the images included in the pdf are publicly available (logos and so on), but some of them are protected behind a login (that is, they are streamed through a servlet if the user is logged in).
When I paste the url in the browser, the image is of course displayed fine, because the browser sends the session with the request. But when Flying Saucer renders the pdf, it doesn't include the protected image because it doesn't know anything about the session.
So, my question is; is there any way to include the byte streams for Flying Saucer to resolve, just as it is possible to add resolvable fonts? I have tried something like this, but there is no easy way to set the UAC on the ITextRenderer, and it complained every time i tried.
You can set the UserAgentCallback this way, and Flying Saucer will use it to resolve the urls (tested, works with Release 8):
ITextRenderer renderer = new ITextRenderer();
renderer.getSharedContext().setUserAgentCallback(new MyUAC());
MyUAC should extend the NaiveUserAgent, and override the resolveAndOpenStream method as the other page suggests.
I overrode ITextUserAgent as well - from the source, looks like that's what ITextRenderer uses. You have to provide the output device in the constructor, which you can get from the renderer object. One other gotcha was you have to set the "shared context" explicitly using the setter method - otherwise you will get an NPE during rendering. Here is the code to set up the object:
ITextRenderer renderer = new ITextRenderer();
MyUserAgentCallback uac = new MyUserAgentCallback(renderer.getOutputDevice());
uac.setSharedContext(renderer.getSharedContext());
renderer.getSharedContext().setUserAgentCallback(uac);
Also, here is the basic idea of MyUserAgentCallback, using basic authentication:
private static class MyUserAgentCallback extends ITextUserAgent
{
public MyUserAgentCallback(ITextOutputDevice outputDevice)
{
super(outputDevice);
}
#Override
protected InputStream resolveAndOpenStream(String uri)
{
if (_isProtectedResource(uri))
{
java.io.InputStream is = null;
uri = resolveURI(uri);
try {
URL url = new URL(uri);
String encoding = new BASE64Encoder().encode ("username:password".getBytes());
URLConnection uc = url.openConnection();
uc.setRequestProperty ("Authorization", "Basic " + encoding);
is = uc.getInputStream();
Log.debug("got input stream");
}
catch (java.net.MalformedURLException e) {
Log.error("bad URL given: " + uri, e);
}
catch (java.io.FileNotFoundException e) {
Log.error("item at URI " + uri + " not found");
}
catch (java.io.IOException e) {
Log.error("IO problem for " + uri, e);
}
return is;
}
else
{
return super.resolveAndOpenStream(uri);
}
}
private boolean _isProtectedResource(String uri)
{
// does this require authentication?
}
}
I want to be able to launch native and J2ME applications through my application using the content handler API (JSR 211) on a Nokia 6212.
At the moment, I am unable to do so, as it always states that there is "No Content Handler Found" and throws a javax.microedition.content.ContentHandlerException.
At the moment, I am trying to get the phone to launch its browser and go to a certain website, just to test that I can use the framework. I have tried many different Invocation objects:
//throw exceptions
new Invocation("http://www.somesite.com/index.html",
"application/internet-shortcut");
new Invocation("http://www.google.co.uk","text/html");
// a long shot, I know
new Invocation("http://www.somesite.com/text.txt","text/plain");
// massive long shot
new Invocation("http://www.google.co.uk","application/browser");
//appears to download the link and content (and definitely does in the Nokia
// emulator) and then throws an exception
new Invocation("http://www.google.co.uk");
new Invocation("http://www.somesite.com/index.html");
Below is the code that I have been using, please bear in mind the parameters often changed to generate the different Invocation objects.
/*
* Invokes an application using the Content Handler API
*/
public void doInvoke(String url, String mime, String payload){
Registry register = Registry.getRegistry(this.getClass().getName());
Invocation invoke = new Invocation(url, mime, null, false,
ContentHandler.ACTION_OPEN);
boolean mustQuit = false;
try {
mustQuit = register.invoke(invoke);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (ContentHandlerException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if(mustQuit){
this.quit();
}
}
Try this:
Registry register = Registry.getRegistry(this.getClass().getName());
You must call Registry.getRegistry for the MIDlet inheritor. Just use your MIDlet for getting the class name.