I am using a webview to submit a form and redirect. When the form is submitted successfully it will print a json response to the console.
My question is how can I get the jsonData String from the client?
chromium: [INFO:CONSOLE(1)] "Callback....jsonData, etc"
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// Insert your code here
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
});
You could extend the WebViewClient class and create a method to intercept the POST request made from clicking the form post button in the HTML in your WebView. Then, make the HTTP POST request in the code, rather than in the WebView and parse the results anyway you wish, then refresh the WebView any way you wish at the end of it all. There is an example of doing so here:
https://github.com/KeejOow/android-post-webview/blob/master/PostWebview/postwebview/src/main/java/com/solidsoftware/postwebview/InterceptingWebViewClient.java
The problem is rather simple.
In the application we want to keep track of the current url being displayed. For that we use shouldOverrideUrlLoading callback from the WebViewClient by saving the url into a class field for every update. Here is the relevant code:
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setDomStorageEnabled(true);
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
mCurrentUrl = url;
// If we don't return false then any redirect (like redirecting to the mobile
// version of the page) or any link click will open the web browser (like an
// implicit intent).
return false;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
...
}
});
mWebView.loadUrl(mInitialUrl);
However, there is at least one scenario, where the callback never gets triggered and the mCurrentUrl field doesnt get updated.
The url: https://m.pandora.net/es-es/products/bracelets/556000
Last updated url (shouldOverrideUrlLoading never gets called when clicking the product): https://m.pandora.net/es-es/products/bracelets
I have tried with callbacks like onPageStarted(), but the url also gets filtered and there doesn't seem to be an accessible one upstream since its protected code.
Reading android documentation about WebView I found this:
https://developer.android.com/guide/webapps/migrating.html#URLs
The new WebView applies additional restrictions when requesting resources and resolving links that use a custom URL scheme. For example, if you implement callbacks such as shouldOverrideUrlLoading() or shouldInterceptRequest(), then WebView invokes them only for valid URLs.
But still doesnt make sense since the above url is generic and should meet the standard.
Any alternative or solution to this?
When you click a product on that web page, it loads the new content in with JavaScript and updates the visible URL in the address bar using the HTML5 History APIs.
From the above MDN article:
This will cause the URL bar to display http://mozilla.org/bar.html, but won't cause the browser to load bar.html or even check that bar.html exists.
These are sometimes called single-page applications. Since the actual loaded page doesn’t change, the WebView callback for page loads isn’t called.
In case you know precisely what kind of HTTP request you want to intercept, you could use the shouldInterceptRequest callback that gets called for each request. It’s likely that the web application loads some data from an API, for example when a product is shown, which you could then detect.
If detecting this isn’t possible, but you’re in control of the web application, you could use the Android JavaScript interface to invoke methods within the Android application directly from the web page.
If you’re not in control of the loaded page, you could still try to inject a local JavaScript file into the web page and observe when the history APIs are used, then call methods in your Android application over the JS interface. I tried observing these events in Chrome with the method described in the previous link and it seems to work fine.
Maybe this helps someone, although the signature in the question is correct, but Android Studio suggests the following method signature:
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
which then never called. It took me a while to notice that the right signature is:
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Sorry if this not 100% fit the question, but I believe this may help someone in the same situation. It's not always easy to notice that the second parameter is different.
Please omit mWebView.getSettings().setDomStorageEnabled(true);
Then again try, if a new url found then will invoke shouldOverrideUrl()
I had the same problem like you, and I've finished with extending of WebViewChromeClient with listening for callback to
public void onReceivedTitle(WebView view, String title)
mWebView.setWebChromeClient(mSWWebChromeClient);
private WebChromeClient mSWWebChromeClient = new WebChromeClient() {
#Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
if (!view.getUrl().equals(mCurrentUrl)) {
mCurrentUrl = view.getUrl();
//make something
}
}
};
For me the problem was below line -
mWebView.getSettings().setSupportMultipleWindows(true);
After removing it shouldOverrideUrlLoading was being called.
after stumbling on this problem and searching for solutions, I've found the one that worked perfectly for me
https://stackoverflow.com/a/56395424/10506087
override fun doUpdateVisitedHistory(view: WebView?, url: String?, isReload: Boolean) {
// your code here
super.doUpdateVisitedHistory(view, url, isReload)
}
Another approach you can try: Catch the url by javascript side. Initialize your webView with this:
webView.addJavascriptInterface(new WebAppInterface(getActivity()), "Android");
After page is completely loaded (You can use an algorithm to check this like this https://stackoverflow.com/a/6199854/4198633), then:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
webView.evaluateJavascript("(function() {return window.location.href;})", new ValueCallback<String>() {
#Override
public void onReceiveValue(String url) {
//do your scheme with variable "url"
}
});
} else {
webView.loadUrl("javascript:Android.getURL(window.location.href);");
}
And declare your WebAppInterface:
public class WebAppInterface {
Activity mContext;
public WebAppInterface(Activity c) {
mContext = c;
}
#JavascriptInterface
public void getURL(final String url) {
mContext.runOnUiThread(new Runnable() {
#Override
public void run() {
//do your scheme with variable "url" in UIThread side. Over here you can call any method inside your activity/fragment
}
});
}
}
You can do something like that to get url, or anything else inside the page.
Add
webView.getSetting().setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
then shouldOverrideUrl will be triggered.
onProgressChanged is always triggered when reloading, loading new page with userclick or XmlHttpRequest.
Compare the URL of previous load and the current load, you'll know it's reloading or loading a new page. This works perfect in my single page Web App.
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{
//a new page was loaded,write this new url to variable
strLastUrl = StrNewUrl;
//do your work here
Log.d("TAG", "A new page or xhr loaded, the new url is : " + strLastUrl);
}
}
super.onProgressChanged(view, progress);
}
});
I've also tried above solutions, but most of them have issue in my case:
doUpdateVisitedHistory sometimes can not return correct url after "#" made by XmlHttpRequest.
My case is a single page web App. The web App uses javascript with
xhr to display new page when user click an item. For example, user is
currently at http://example.com/myapp/index.php , after clicking, the
browser url becomes
http://example.com/myapp/index.php#/myapp/query.php?info=1, but in
this case, doUpdateVisitedHistory returns
http://example.com/myapp//myapp/
onReceivedTitle doesn't work in my case because the response retrieved by XMLHttpRequest does not have <title></title> tag.
The JavascriptInterface method also works, but I'm afraid it will cause
security related issues with javascript.
public class AndroidMobileAppSampleActivity extends Activity {
/** Called when the activity is first created. */
String mCurrentUrl="";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView mWebView = (WebView) findViewById(R.id.mainWebView);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.setWebViewClient(new MyCustomWebViewClient());
mWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
mWebView.loadUrl("https://m.pandora.net/es-es/products/bracelets/556000");
}
private class MyCustomWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
mCurrentUrl = url;
Log.i("mCurrentUrl",""+mCurrentUrl);
view.loadUrl(url);
return true;
}
}
}
try this one...
I am loading an URL in webview. i.e. first I am loading a login page in a Webview. Then after user type username and password and tap login button in webview page, it shows the particular session key for that logon in the webview. Now I want to read that session key and hide that information from user. Is anybody has the idea how to do that?
Thanks.
The same question has been answered multiple times. And all the answers refer to the this post. Though this post has warnings in the end, I could not find any other eaiser way to achive what tou are looking for.
Below is the copy-paste of the code from this post.
final Context myApp = this;
/* An instance of this class will be registered as a JavaScript interface */
class MyJavaScriptInterface
{
#JavascriptInterface
#SuppressWarnings("unused")
public void processHTML(String html)
{
// process the html as needed by the app
}
}
//Edit 1 start
final ProgressDialog pd = ProgressDialog.show(OnlinePaymentActivity.this, "", "Please wait, your transaction is being processed...", true);
//Edit 1 end
final WebView browser = (WebView)findViewById(R.id.browser);
/* JavaScript must be enabled if you want it to work, obviously */
browser.getSettings().setJavaScriptEnabled(true);
/* Register a new JavaScript interface called HTMLOUT */
browser.addJavascriptInterface(new MyJavaScriptInterface(), "HTMLOUT");
/* WebViewClient must be set BEFORE calling loadUrl! */
browser.setWebViewClient(new WebViewClient() {
/////Edit 2 start
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
If(browser.getVisibility() == View.VISIBLE)
{
browser.setVisibility(View.GONE);
}
pd.show();
}
///// Edit 2 end
#Override
public void onPageFinished(WebView view, String url)
{
//Edit 3 start
If(browser.getVisibility() == View.GONE)
{
browser.setVisibility(View.VISIBLE);
}
pd.dismiss();
// Edit 3 end
/* This call inject JavaScript into the page which just finished loading. */
browser.loadUrl("javascript:window.HTMLOUT.processHTML('<head>'+document.getElementsByTagName('html')[0].innerHTML+'</head>');");
}
});
/* load a web page */
browser.loadUrl("http://lexandera.com/files/jsexamples/gethtml.html");
I found a way of doing this. i.e. First I am reading the token in the body text and once the token found, make the webView to invisible. Your suggestion is not applicable for me as sometimes I want to show the login page. i.e. if the user is not login to the particular account, we should show the web view. Once they return the token after login, webview should be hidden.
I load "www.gmail.com" in a webview,after login the a new webpage will be loaded i.e. our gmail account page.
I have to track that url when I submit login details and the new webpage is loading,I don't need any hard coded value to redirect to any webpage,I want to get that url when a webpage is loaded from another webpage,how can I achieve this.Please help me.
This is my code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
title_text=(TextView)findViewById(R.id.urltxt);
showWeb=(WebView)findViewById(R.id.webview_details_body);
showWeb.setWebViewClient(new HelloWeb());
showWeb.getSettings().setBuiltInZoomControls(true);
showWeb.getSettings().setLoadWithOverviewMode(true);//show the webpage in fullsize with all info
showWeb.getSettings().setUseWideViewPort(true);
WebSettings webSettings = showWeb.getSettings();
webSettings.setJavaScriptEnabled(true);
showWebClick();
}
private void showWebClick() {
showWeb.loadUrl("http://www.gmail.com/");
}
public boolean onKeyDown(int keyCode,KeyEvent event){
if((keyCode==KeyEvent.ACTION_DOWN)&&showWeb.canGoBack()){
showWeb.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
public class HelloWeb extends WebViewClient{
#Override
public boolean shouldOverrideUrlLoading(WebView vw,String url){
vw.loadUrl(url);
s=vw.getUrl();
title_text.setText( s);
return super.shouldOverrideUrlLoading(vw, url);
}
}
}
You can achieve this using method getUrl() of webview client.
But, This is not always the same as the URL passed to WebViewClient.onPageStarted because although the load for that URL has begun, the current page may not have changed.
You can refer below link :
http://developer.android.com/reference/android/webkit/WebView.html#getUrl%28%29
So you have to call geturl method on onPageFinished method. It will be good.
#Override
public void onPageFinished(WebView view, String url) {
/*do your stuff here.*/
}
Your webview will most likely call either shouldOverrideUrlLoading or onLoadResource in its webviewclient with an url of its redirect.
If I understand your question correct, try overriding onLoadResource in your WebViewClient and look at the url parameter.
Using onLoadResource will also generate urls for other resources as well, such as images.
I have written a simple helloworld app with a WebView which has a link to CNN on a simple.html page in my asset folder.
cnn.com
How can I capture the click on this on my Activity, stop the WebView from navigating, and then inform the Activity that "http://CNN.com" was clicked?
Then you have to set a WebViewClient to your WebView and override shouldOverrideUrlLoading and onLoadResource methods. Let me give you a simple example:
WebView yourWebView; // initialize it as always...
// this is the funny part:
yourWebView.setWebViewClient(yourWebClient);
// somewhere on your code...
WebViewClient yourWebClient = new WebViewClient(){
// you tell the webclient you want to catch when a url is about to load
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url){
return true;
}
// here you execute an action when the URL you want is about to load
#Override
public void onLoadResource(WebView view, String url){
if( url.equals("http://cnn.com") ){
// do whatever you want
}
}
}