Develop Reference

Android webview - shouldOverrideUrlLoading() not called in some jsp pages

I've been developing hybrid apps for many companies with mobile websites.
And as a matter of fact, there are some websites made with using jsp.
I already had the knowledge that iframes and javascripts xhr requests will not fire webViewClient's shouldOverrideUrlLoading override function. I'm fine with that.
But today I learned that SOME actions such as:
JSP Page Redirects
Link Clicks within a JSP page
JSP/JS induced URL Loads
will not ALWAYS fire this function.
Hence, shouldOverrideUrlLoading() does not fire, when the webView is asked to load a page that it cannot load(i.e. "intent://...",) it shows an error page.
Has anyone encountered this kind of behaviour and is there any solution to work around it ?
Below is the code I'm using to invoke activities, where urls with 'intent:' protocol (which will fail because this function never gets called when above actions are performed)
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// ... omitted ...
if ( url.startsWith("intent:") ) {
Intent intent = null;
try {
intent = Intent.parseUri(url, Intent.URI_INTENT_SCHEME);
// The following flags launch the app outside the current app
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
try {
getActivity().startActivity(intent);
} catch (ActivityNotFoundException e) {
e.printStackTrace();
}
} catch (URISyntaxException e) {
e.printStackTrace();
}
return true;
}
}
ps. please notice that every other websites' page loads will perfectly call shouldOverrideUrlLoading().
I couldn't find any JSP related bugs on android webViews so I'm asking one.
ps. I am happily willing to provide sample websites that some gracious readers will try on.. but the website's written in Korean so I doubt it will help.
Thank you!

Your problem might not related to JSP, the real problem may be shouldOverrideUrlLoading() itself. In this case, using shouldOverrideUrlLoading() may not be a good idea, so why not try another perspective?
I've encountered many problems when using
shouldOverrideUrlLoading() loading XmlHttpRequest. At the end, I
came up with the idea using onProgressChanged() and it solved all
my problems. I've written a similar answer here.
I tried adding your code into my own webview project and tested it with some JSP sites, and looks like it always work. I also added loadUrl() after other activities are invoked, so after pressing the back button, the loading error page will not be displayed again. So try this one :
First declare a global variable to store last URL.
String strLastUrl = null;
Then override onProgressChanged(WebView view, int progress)
mWebView.setWebChromeClient(new MyWebChromeClient(){
#Override
public void onProgressChanged(WebView view, int progress) {
if (progress == 100) {
//A fully loaded url will come here
String StrNewUrl = view.getUrl();
if(TextUtils.equals(StrNewUrl,strLastUrl)){
//same page was reloaded, not doing anything
}else{
String strOldUrl = null;
//save old url to variable strOldUrl before overwriting it
strOldURL = strLastUrl;
//a new page was loaded,overwrite this new url to variable
strLastUrl = StrNewUrl;
if ( strLastUrl.startsWith("intent:") ) {
Log.d("TAG", "intent triggered");
Intent intent = null;
try {
intent = Intent.parseUri(strLastUrl, Intent.URI_INTENT_SCHEME);
// The following flags launch the app outside the current app
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP);
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
e.printStackTrace();
}
//reload the page before invoking other activities
view.loadUrl(strOldURL);
} catch (URISyntaxException e) {
e.printStackTrace();
}
}
}
}
super.onProgressChanged(view, progress);
}
});

Android twitter callback URL error

Okay so I am creating a twitter clone, the only problem I am having right now is that the callback URL is getting me back to the app but instead giving me a page not found error.
I saw some similar questions here in stackoverflow and followed the steps.
I am getting the Authentication URL using the code:
public String beginAuthorization(){
try{
if(null==currentRequestToken){
currentRequestToken = twitter.getOAuthRequestToken(TWITTER_CALLBACK_URL);
}
return currentRequestToken.getAuthenticationURL();
}catch (TwitterException te){
te.printStackTrace();
}
return null; }
Next I am retrieving the Access Token using the code:
public void setAccessToken(Uri uri) {
if (uri != null && uri.toString().startsWith(TWITTER_CALLBACK_URL)) {
String verifier = uri.getQueryParameter("oauth_token");
try {
AccessToken accessToken = twitter.getOAuthAccessToken(app.currentRequestToken, verifier);
//shared prefs
SharedPreferences.Editor e = yambaSharedPrefs.edit();
e.putString(PREF_KEY_OAUTH_TOKEN, accessToken.getToken());
e.putString(PREF_KEY_OAUTH_SECRET, accessToken.getTokenSecret());
//store log in status
e.putBoolean(PrefSharedTwitterLoggedIn, true);
e.apply();
Intent intent = new Intent(this, StatusActivity.class);
startActivity(intent);
} catch (TwitterException e) {
e.printStackTrace();
}
} }
My Callback URL looks like this:
public static final String OAUTH_CALLBACK_SCHEME = "twitter4j-MiYAMBA";public static final String OAUTH_CALLBACK_HOST = "callback";public static final String TWITTER_CALLBACK_URL = OAUTH_CALLBACK_SCHEME + "://" + OAUTH_CALLBACK_HOST;
I have also added the callback URL in the intent filter, like:
data android:host="callback" android:scheme="twitter4j-MiYAMBA"
Now I am not sure where the problem might be.
Also here is how the control flows through out the app:
StatusActivity is launched when the app is run, it checks if AccessToken are set or not using a function isAuthorised() which is defined in an Android application class named YAMBAapp, if it is defined then it begins the setup of layout, that is making buttons and stuff visible else it passes the control to a function beginAuthorization(), which starts an Activity named AuthorizationActivity, which gets the Authentication URL and passes it to the WebView, all of this is done in the function onResume, in this function I call another function setAccessToken and pass the 'uri' that has has data using:
uri = getIntent().getData();
setAccessToken(uri);
I have pasted the code for setAccessToken above.
Also in the manifest I have defined the "data" item in the intent filter of "AuthorizationActivity" and not the "StatusActivity", though it has no effect what so ever.
Please help, I really am stuck for few days now :)

First thing first, when you launch twitter authentication using default web browser, you will never return back to your main application, once access tokens are received and hence page not found, as url being invalid.
What you need is to load authenticaton using a web view through your own app, now you can override few functioanlities here like when being redirected. here you need to do final processing and terminate web view, which will result into control coming back to your own application rather then seeing page not found in browser.
Example: Here is how you oveerride an webview mechanism, now you create an actvity with theme like dialog or whatever, and load this webview in it with twitter auth url, once user authtenticate himself shouldOverrideUrlLoading will be called, here you retrive back verifier and quit..
webView.setWebViewClient( new WebViewClient()
{
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url)
{
// your url pattern here
if( url.contains("callback://twitter4j-MiYAMBA"))
{
Uri uri = Uri.parse( url );
// you get the verifier here
String oauthVerifier = uri.getQueryParameter( "oauth_verifier" );
// Do whateever u want here
..oauthVerifier.
//
// Finish this task, so you return back to activity from where it started
finish();
return true;
}
return false;
}
});
I guess this would be enough to finish rest of implementation. more info here '
http://daiwei.lu/2014/01/22/twitter-oauth-flow-on-android/

Autologin google, redirection webview not working

In Android i have a webview that lead to an google authentication form. When the authentication form is loaded in the webview it will call onReceivedLoginRequest:
public void onReceivedLoginRequest(final AuthenticationWebView client, final WebView view, final String realm,
final String account, final String args) {
...
}
When this method is called i get the Accounts stored on the device and let the user choose one and use that one to retrieve an authtoken:
mAccountManager.getAuthToken(account, mAuthToken, null, mWebViewActivity, this, null);
It all works perfectly fine (i think) and the next step looks good also:
final String result = bundle.getResult().getString(AccountManager.KEY_AUTHTOKEN);
if (result != null) {
// authentication succeeded, new url given as result for redirection
mWebView.loadUrl(result);
} else {
onLoginFailed();
}
A new method is called and returns the new url for redirection which i load in the webview. The result String returns a new adress which looks good but does nothing, it doens't log in but i don't get any message error either from the webview.
Url:
https://accounts.google.com/MergeSession?args=..&uberauth=WILL_NOT_SIGN_IN&source=AndroidWebLogin
I modified the url a bit with (triple)dots, don't know how secure it is and it was not such an interesting part of the url.
Anyone know why the url will not redirect me to the website behind it? When i use this url in my browser it recognizes my account, i only have to fill in my password and it redirects me correctly.
I use a native Android webview and i inject it with javascript but this only happens on the page after the login.
The settings i added to the webview are:
mSettings = getSettings();
mSettings.setJavaScriptEnabled(true);
mSettings.setDomStorageEnabled(true);
mSettings.setAllowFileAccess(true);
mSettings.setGeolocationEnabled(true);

How to establish communication between webview and html page in worklight?

I'm working on making a browser as a hybrid app using worklight framework for Android. I implemented my address bar as an input element which received the user input and pass the arguments to the webview to load the page.
However, I cannot figure out how to do the reverse: whenever the user click on a link in webview, I want the address bar to change to the new location.

Are you implementing a native page that is opened? If so, take a look at ChildBrowser, that basically does the same thing. It has a TextView being used as an address bar. You may decide to use it, or get the bits and pieces you want out of it. Regardless, I would image what you want to do something like this. By overriding the onLoadResource in the WebViewClient, you should be able to grab the url and change your TextBox.
In response to the comment below: inside your environment's main js file in the wlEnvInit() function:
function wlEnvInit(){
wlCommonInit();
// Environment initialization code goes here
document.onclick=manageLinks;
}
Then in this function get the url and set the text of your input element:
function manageLinks(event) {
var link = event.target;
//go up the family tree until we find the A tag
while (link && link.tagName != 'A') {
link = link.parentNode;
}
if (link) {
var url = link.href;
console.log("url = " + url);
//You can decide if you want to separate external or
//internal links, depending on your application
var linkIsExternal = ((url.indexOf('http://') == 0) || (url.indexOf('https://') == 0));
if (linkIsExternal) {
myInput.setText(url);
return false;
}
}
return true;
}
Inside of your WebView, inside the plugin, intercept the URL like this:
webview.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
//use this area to set your input. Depending on how you
//implemented your plugin, you may need to return this value
//back to your main activity
Toast.makeText(cordova.getActivity(), "Loading: " + url, Toast.LENGTH_LONG).show();
}
});

Have you try to get the url from the href of and assign to the input variable and do the get/post? I know that it is possible in SDK i figure it dont will be harder in a framework. You can store the hiperlinks in a array with a parser or something similar.
example pseudocode:
When_hiperlink_clicked: //could be like a listener (search about it)
url = hiperlink.getURL("myHiperlink");
myinput.setText(url);
execute_input_bar_action();
Is difficult to figure out without code or something more, sorry.

WebView.loadUrl(url) does nothing

I recently wrote up a simple Twitter app for Android to learn the ropes of the Twitter API and OAuth.
The app's main activity simply asks for a username to follow. It then calls another activity which handles the OAuth & Twitter API calls. It redirects the user to an authorization page, which then returns to the app after the user finishes.
It used to work just fine, but now for some reason when I call webview.loadUrl(authorizationURL), NOTHING happens. I never changed anything that would affect the WebView stuff though... Here's my code:
#Override
public void onResume() {
super.onResume();
try {
if(weNeedCredentials()) {
obtainCredentials();
}
follow(mUsername);
} catch (OAuthException oae) {
// omitted
}
}
private boolean weNeedCredentials() {
// assume the method returns true
}
private void obtainCredentials() {
final Token requestToken = mOauthService.getRequestToken();
String authUrl = mOauthService.getAuthorizationUrl(requestToken);
// I verified that authUrl is the correct url (and != null)
final WebView oauthView = (WebView) findViewById(R.id.oauthview);
oauthView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if(someCondition) {
oauthView.setVisibility(View.GONE);
doOtherStuff();
return true;
}
return super.shouldOverrideUrlLoading(view, url);
}
});
oauthView.getSettings().setJavaScriptEnabled(true);
oauthView.loadUrl(authUrl);
}
Here's my layout xml file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<WebView
android:id="#+id/oauthview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
and also I included the proper Internet permissions in the Manifest.
A WebViewCoreThread is running for the life of the app, and a WebViewWorkerThread pops in later, but no WebView ever comes up (not even a white screen). The app never blocks either. It continues running as if the loadUrl() line were simply commented out.
I've tested on my phone (Droid X2) as well as an emulator, both with the same results. Any help would be greatly appreciated.
Thanks in advance!

It continues running as if the loadUrl() line were simply commented out.
It will always "continue running as if the loadUrl() line were simply commented out". loadUrl() is asynchronous and does not block.
Off the cuff, either:
weNeedCredentials() is returning false, or
follow() is replacing the UI, or
Twitter is doing a redirect, and someCondition is true, so you are making the WebView be GONE right away
there are issues with the URL that you are loading