Develop Reference

Display a pdf with dynamic generating url in WebView / Google Docs

so I just started with Android programming and I am trying to make a little app using WebView. There is a url that redirects you to a pdf, I know WebView does not render pdf. So I want to use intent and display the pdf in Google Docs. However, the pdf address is randomly generated so I cant link it with
WebView.loadUrl("http://docs.google.com/gview?embedded=true&url=" + pdfURL);
How can I send an intent to Google Docs without using the exact pdf address?

I don't know what "randomly generated" means.
But the first thing that comes to my mind is to set a WebViewClient and override shouldOverrideUrlLoading:
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.endsWith(".pdf") == true) {
view.loadUrl("http://docs.google.com/gview?embedded=true&url=" + url);
return true;
}
return false;
}
});
Some more info in this thread.

Android webview - how to skip url?

I have a webview with custom webview client. I'm intercepting requests with:
#Override
public WebResourceResponse shouldInterceptRequest(WebView view, String url) {
// ...
}
sometimes I'm getting informations about custom events from webview in a form of a link:
xyz://do-something
When it happens I want webview to ignore it. But 'shouldInterceptRequest' has to return something and when I'm returning 'null' instead of my page it shows: 'unknown url xyz://do-something'. How can I deal with that? How can I intercept the link but disable action on webview side?

You just need to do a string comparison from the site that you are in and the site that you want to go to.
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().equals("www.example.com")) {
// This is my web site, so do not override; let my WebView load the page
return false;
}
// Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}

webview manual url redirection (manually set url's to show and skip)

Im using a webview to display a website.
The page iam opening using loadurl method is the login page,
on successful login redirection occurs to a particular page .
I want to skip that page i.e dont want to show that page rather show the webpage after that
eg If my webview starts with webpage A
on login success it shows webpage B
and then next page is webpage C
i want after Login success in page A it should go automatically to webpage C
current code im using
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url)
.getHost()
.equals("https://www.test.com")) {
web.loadUrl("https://www.test1.com");
}
return false;
}
so any tips/pointers as to how i do this?
thanks

Read this
You just need to do a string comparison from the site that you are in and the site that you want to go to.
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().equals("www.example.com")) {
// This is my web site, so do not override; let my WebView load the page
return false;
}
// Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}

PDF display in Android using WebView

I'm trying to display PDF in Android using WebView, I'm using google docs for this purpose. It was working fine till this morning. But all of a sudden it's throwing 502 error.
Is there any alternative to display PDF's in WebView.
This is the URL I have been using to render PDF in WebView
https://docs.google.com/gview?embedded=true&url=+URL
It looks like https://docs.google.com/gview?embedded=true&url= is down.

Try this way
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
if (url.endsWith(".pdf"))
{
// Load "url" in google docs
String googleDocs = "https://docs.google.com/viewer?url=";
mWebView.loadUrl(googleDocs + url);
}
else
{
// Load all other urls normally.
view.loadUrl(url);
}
return true;
}
UPDATE try this
webview.loadUrl("http://docs.google.com/gview?embedded=true&url=" + url);

shouldOverrideUrlLoading in WebView for Android not running

-Edit: Solution Found-
Figured it out after some heavy searching - one person (I literally mean one) said they instead used onPageLoad(); which worked perfectly for my purposes. The difference is that onPageLoad() runs later than shouldOverrideUrlLoading, but It doesn't make a difference in my code.
I'm trying to set up Twitter authorization with OAuth for an Android app, and thus far I can successfully send the user to the authorization URL, however, what I am trying to do now is intercept the redirect to the callback (which would just lead to a 404 error, our callback URL isn't going to have an associated page on our servers). What I'm attempting to do is check if the URL is our callback, then extract the OAuth Verifier from the URL. I setup my WebView with this code:
view = (WebView)findViewById(R.id.twitterWbVw);
view.setWebViewClient(new WebViewClient(){
#Override
public boolean shouldOverrideUrlLoading(WebView wView, String url)
{
String urlHolder;
String[] verifExtrctr;
urlHolder = url.substring(0, url.indexOf('?'));
System.out.println("url");
if(urlHolder.equalsIgnoreCase(CALLBACK_URL))
{
verifExtrctr = urlHolder.split("?");
verifExtrctr = verifExtrctr[2].split("=");
if(verifExtrctr[0].equalsIgnoreCase("oauth_verifier"))
{
params[5] = verifExtrctr[1];
return true;
}
else
{
System.out.println("Inocorrect callback URL format.");
}
}
else
{
wView.loadUrl(url);
}
return true;
}
});
view.loadUrl(urlAuthorize.toExternalForm());
Thing is even System.out.println("url");(which I'm using to debug)doesn't run! So I'm pretty much dry on ideas, and can't find anyone with a similar problem. The authorization URL goes through fine, and I can successfully authorize the app, however the redirect to the callback URL for some reason never get's intercepted. Any help would be appreciated, this is in my onResume() if that matters.

After some research I conclude that despite what most of the tutorials out there say, shouldOverrideUrlLoading() does not get called when:
You load a URL like
loadUrl("http://www.google.com");
The browser redirects the user automatically via an HTTP Redirect. (See the comment from #hmac below regarding redirects)
It does however, get called when you you click on a link inside a webpage inside the webview. IIRC the twitter authorization uses an HTTP Redirect.. Bummer, this would be helpful if it worked how all the tutorials say it does. I think this is from a very old version the Android API...
You might want to consider overriding the onProgressChanged method of a WebChromeClient like here: How to listen for a WebView finishing loading a URL? or the onPageFinished() method of the WebViewClient.

I've found what I think is a reasonable way to do this thanks to the previous answer and comments pointing me in the right direction.
What I did is override onPageStarted and onPageFinished in a custom WebViewClient.
The code goes something like this...
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
if (pendingUrl == null) {
pendingUrl = url;
}
}
#Override
public void onPageFinished(WebView view, String url) {
if (!url.equals(pendingUrl)) {
Log.d(TAG, "Detected HTTP redirect " + pendingUrl + "->" + url);
pendingUrl = null;
}
}
And of course along with the Log.d you would put any specific code you want to run upon detecting the redirect.

For people stumbling across this, when the method shouldOverrideUrlLoading(WebView view, WebResourceRequest request) is not being called, look up your minSdkVersion. If you use below API 24 you should use shouldOverrideUrlLoading(WebView view, String url).