Recently I faced a pretty annoying issue, So I am loading an iframe (youtube video) in my webview and checking if the WebView has finished loading, it works for other contents but not for iFrame, it shows the page loading finished way before the iFrame is fully loaded. I tried in both SetWebChromeClient and SetWebViewClient - In both cases, loading finishes way before the iFrame finishes loading.
I have simple WebView
webView.LoadDataWithBaseURL("https://.", IFRAME_HERE, "text/html", "UTF-8", null);
So Setting webView.SetWebViewClient(new WebViewClientClass()); with the following
public override void OnPageStarted(WebView view, string url, Bitmap favicon)
{
base.OnPageStarted(view, url, favicon);
Log.Info("101029", "STARTED");
}
public override void OnPageFinished(WebView view, string url)
{
base.OnPageFinished(view, url);
Log.Info("101029", "FINISHED");
}
Or setting webView.SetWebChromeClient(new NewClient(ParentLayout, ContentLayout)) with the following
public override void OnProgressChanged(WebView view, int newProgress)
{
base.OnProgressChanged(view, newProgress);
if (newProgress == 100)
{
Log.Info("101029", "Finished");
}
else
{
Log.Info("101029", newProgress.ToString());
}
}
Same things happen, Webview shows loading is finished while the iFrame is still loading. How do I tackle the loading of iFrames to accurately get when the iFrame has finished loading?
any idea? Cheers
EDIT:
I also tried the following for `` (Still no luck)
internal class WebViewClientClass : WebViewClient
{
bool loadingFinished = true;
bool redirect = false;
public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request)
{
if (!loadingFinished)
{
redirect = true;
}
loadingFinished = false;
Android.Net.Uri url = request.Url;
view.LoadUrl(url.ToString());
return true;
}
public override void OnPageStarted(WebView view, string url, Bitmap favicon)
{
base.OnPageStarted(view, url, favicon);
loadingFinished = false;
Log.Info("101029", "loading started");
}
public override void OnPageFinished(WebView view, string url)
{
if (!redirect)
{
loadingFinished = true;
}
if (loadingFinished && !redirect)
{
base.OnPageFinished(view, url);
Log.Info("101029", "loading finised");
}
else
{
redirect = false;
}
}
}
I created a basic webview app...
It has a Progress Bar which hides after the page has loaded completely,
On top of it I created a FAB without library i.e. by using ImageButton...
I want to Show the FAB only after page load & not everytime (e.g Like when Offline)
how to achieve that?
here's the Code pic...
Implement WebViewClient and extend onPageFinished() as follows,
mWebView.setWebViewClient(new WebViewClient() {public void onPageFinished(WebView view, String url) {
// do your stuff here
fab.setVisibility(View.VISIBLE);
}});
here is my solution to hide the progress dialog when page loaded.
webView.setWebViewClient(new WebViewClient() {
private int webViewPreviousState;
private final int PAGE_STARTED = 0x1;
private final int PAGE_REDIRECTED = 0x2;
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
webViewPreviousState = PAGE_STARTED;
if (dialog == null || !dialog.isShowing())
dialog = ProgressDialog.show(MainActivity.this, "", getString(R.string.dialog_loading), true, true,
new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
// relax
}
});
}
#Override
public void onPageFinished(WebView view, String url) {
if (webViewPreviousState == PAGE_STARTED) {
dialog.dismiss();
dialog = null;
}
}
});
}
The question can be a little vague, I have created a webview and showing the webpage of the URL which I get from some server. Now When i navigate to different pages , On one page there is only a button which will send me a different URL , I need that when user is on that page and click on that button the webview should hide and user continue other operation. I have read that addJavascriptInterface is needed to do this , can anyone tell me if this is possible and how to achieve this , any good tutorial will work.
I also tried this but of no use
wv.setOnLongClickListener(new OnLongClickListener() {
#Override
public boolean onLongClick(View v) {
HitTestResult result = wv.getHitTestResult();
if (result.getType() == HitTestResult.UNKNOWN_TYPE) {
Message msg = mHandler.obtainMessage();
wv.requestFocusNodeHref(msg);
}
return false;
}
});
topupWV.setWebViewClient(new WebViewClient());
topupWV.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("XXXXX")) {
try {
URL urls = new URL(url);
query = urls.getQuery();
} catch (MalformedURLException e) {
e.printStackTrace();
}
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
});
}
you can do something like this for detecting click within a webview
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (isNetworkConnected()) {
//DO YOU OPERATION HERE
}
return true;
}
});
My question is different from this one guys..
I wany my progress dialog start when page load starts and end when the page load finished in my webview. My problem is the progress dialog starts and never get dismissed.I have set break points it shows that the progress dialog starts and get dismissed many times then it starts and not get dismissed even after page load completed. My question is why the onPageStarted getting executed many time for a single page loading?
and why onPageFinished not called after completion of page load?
myWebView.setWebViewClient(new WebViewClient(){
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
myWebView.loadUrl(url);
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(myWebView, url, favicon);
Log.d("mytag","Page Loading Started");
//myURLProgressDialog= ProgressDialog.show(WebviewExampleActivity.this, "Page Loading", "Wait for a moment...");
}
#Override
public void onPageFinished(WebView view, String url) {
Log.d("mytag","Page Loading Finished!");
super.onPageFinished(myWebView, url);
//myURLProgressDialog.dismiss();
}
});
My self tagged filtered Log is Like this for loading single page:
10-06 10:32:49.298: DEBUG/mytag(508): Page Loading Started
10-06 10:32:49.998: DEBUG/mytag(508): Page Loading Started
10-06 10:32:50.048: DEBUG/mytag(508): Page Loading Finished!
10-06 10:32:50.048: DEBUG/mytag(508): Page Loading Started
10-06 10:33:00.898: DEBUG/mytag(508): Page Loading Finished!
When I am clicking link on already loaded page it works fine. Here is
Log:
10-06 10:59:25.098: DEBUG/mytag(543): Page Loading Started
10-06 10:59:30.889: DEBUG/mytag(543): Page Loading Finished!
Check whether it is already open with .isShowing().
final ProgressDialog mProgressDialog = new ProgressDialog(this);
mProgressDialog.setMessage("Loading...");
browser.setWebViewClient(new myViewClient(){
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
if(!mProgressDialog.isShowing())
{
mProgressDialog.show();
}
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if(mProgressDialog.isShowing()){
mProgressDialog.dismiss();
}
}
});
If you have ajax calls in the page being loaded, onPageFinished() will be called only when those calls finish.
Better to make those calls with a window.setTimeout(). In that case, UI thread will not be blocked on those calls and onPageFinished() will be called as soon as the main page loads.
Here is a solution. Instead of a loading dialog, i use another webview as splash-screen, but you can change it easily.
The trick is, to look if there is a new "onpagestart" right after the "onpagefinished". If this is the case, don't close the loading and wait for the next "onpagefinished".
myWebView.setWebViewClient(new WebViewClient() {
boolean loadingFinished = true;
boolean redirect = false;
long last_page_start;
long now;
// Load the url
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (!loadingFinished) {
redirect = true;
}
loadingFinished = false;
view.loadUrl(url);
return false;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Log.i("p","pagestart");
loadingFinished = false;
last_page_start = System.nanoTime();
show_splash();
}
// When finish loading page
public void onPageFinished(WebView view, String url) {
Log.i("p","pagefinish");
if(!redirect){
loadingFinished = true;
}
//call remove_splash in 500 miSec
if(loadingFinished && !redirect){
now = System.nanoTime();
new android.os.Handler().postDelayed(
new Runnable() {
public void run() {
remove_splash();
}
},
500);
} else{
redirect = false;
}
}
private void show_splash() {
if(myWebView.getVisibility() == View.VISIBLE) {
myWebView.setVisibility(View.GONE);
myWebView_splash.setVisibility(View.VISIBLE);
}
}
//if a new "page start" was fired dont remove splash screen
private void remove_splash() {
if (last_page_start < now) {
myWebView.setVisibility(View.VISIBLE);
myWebView_splash.setVisibility(View.GONE);
}
}
});
Sometimes happens that when the initial page loads, some script makes a redirect (because it needed a session ID, or something that would make the page load again).
You can check if a different page (or the same one with additional parameters) is loading by logging the url parameter.
I guess that if a new load request is made before the first page finishes loading, then the OnPageFinished method won't be called for that first page.
When a page submit on webview app: onPageStarted Fired, but onPageFinished not Fired so follow code below fixed and exactly
ProgressDialog pd = null;
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
if(pd == null || !pd.isShowing()) {
pd = new ProgressDialog(MainActivity.this);
pd.setTitle("Please wait");
pd.setMessage("App is loading...");
pd.show();
}
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (pd != null) {
pd.dismiss();
}
}
I have a WebView that is loading a page from the Internet. I want to show a ProgressBar until the loading is complete.
How do I listen for the completion of page loading of a WebView?
Extend WebViewClient and call onPageFinished() as follows:
mWebView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
// do your stuff here
}
});
#ian this is not 100% accurate. If you have several iframes in a page you will have multiple onPageFinished (and onPageStarted). And if you have several redirects it may also fail. This approach solves (almost) all the problems:
boolean loadingFinished = true;
boolean redirect = false;
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String urlNewString) {
if (!loadingFinished) {
redirect = true;
}
loadingFinished = false;
webView.loadUrl(urlNewString);
return true;
}
#Override
public void onPageStarted(WebView view, String url) {
loadingFinished = false;
//SHOW LOADING IF IT ISNT ALREADY VISIBLE
}
#Override
public void onPageFinished(WebView view, String url) {
if (!redirect) {
loadingFinished = true;
//HIDE LOADING IT HAS FINISHED
} else {
redirect = false;
}
}
});
UPDATE:
According to the documentation:
onPageStarted will NOT be called when the contents of an embedded frame changes, i.e. clicking a link whose target is an iframe.
I found a specific case like that on Twitter where only a pageFinished was called and messed the logic a bit. To solve that I added a scheduled task to remove loading after X seconds. This is not needed in all the other cases.
UPDATE 2:
Now with current Android WebView implementation:
boolean loadingFinished = true;
boolean redirect = false;
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(
WebView view, WebResourceRequest request) {
if (!loadingFinished) {
redirect = true;
}
loadingFinished = false;
webView.loadUrl(request.getUrl().toString());
return true;
}
#Override
public void onPageStarted(
WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
loadingFinished = false;
//SHOW LOADING IF IT ISNT ALREADY VISIBLE
}
#Override
public void onPageFinished(WebView view, String url) {
if (!redirect) {
loadingFinished = true;
//HIDE LOADING IT HAS FINISHED
} else {
redirect = false;
}
}
});
I am pretty partial to #NeTeInStEiN (and #polen) solution but would have implemented it with a counter instead of multiple booleans or state watchers (just another flavor but I thought might share). It does have a JS nuance about it but I feel the logic is a little easier to understand.
private void setupWebViewClient() {
webView.setWebViewClient(new WebViewClient() {
private int running = 0; // Could be public if you want a timer to check.
#Override
public boolean shouldOverrideUrlLoading(WebView webView, String urlNewString) {
running++;
webView.loadUrl(urlNewString);
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
running = Math.max(running, 1); // First request move it to 1.
}
#Override
public void onPageFinished(WebView view, String url) {
if(--running == 0) { // just "running--;" if you add a timer.
// TODO: finished... if you want to fire a method.
}
}
});
}
I found one elegant solution as well, have not tested it rigorously though:
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if (webView.getProgress() == 100) {
progressBar.setVisibility(View.GONE);
webView.setVisibility(View.VISIBLE);
}
}
If you want show a progress bar you need to listen for a progress change event, not just for the completion of page:
mWebView.setWebChromeClient(new WebChromeClient(){
#Override
public void onProgressChanged(WebView view, int newProgress) {
//change your progress bar
}
});
BTW if you want display just an Indeterminate ProgressBar overriding the method onPageFinished is enough
I have simplified NeTeInStEiN's code to be like this:
mWebView.setWebViewClient(new WebViewClient() {
private int webViewPreviousState;
private final int PAGE_STARTED = 0x1;
private final int PAGE_REDIRECTED = 0x2;
#Override
public boolean shouldOverrideUrlLoading(WebView view, String urlNewString) {
webViewPreviousState = PAGE_REDIRECTED;
mWebView.loadUrl(urlNewString);
return true;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
webViewPreviousState = PAGE_STARTED;
if (dialog == null || !dialog.isShowing())
dialog = ProgressDialog.show(WebViewActivity.this, "", getString(R.string.loadingMessege), true, true,
new OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
// do something
}
});
}
#Override
public void onPageFinished(WebView view, String url) {
if (webViewPreviousState == PAGE_STARTED) {
dialog.dismiss();
dialog = null;
}
}
});
It is easy to understand, OnPageFinished if the previous callback is on onPageStarted, so the page is completely loaded.
for Kotlin users:
webView.webViewClient = object : WebViewClient() {
override fun onPageFinished(view: WebView?, url: String?) {
// do your logic
}
}
there are a lot of methods that you can override though
Use setWebViewClient() and override onPageFinished()
You can trace the Progress Staus by the getProgress method in webview class.
Initialize the progress status
private int mProgressStatus = 0;
then the AsyncTask for loading like this:
private class Task_News_ArticleView extends AsyncTask<Void, Void, Void> {
private final ProgressDialog dialog = new ProgressDialog(
your_class.this);
// can use UI thread here
protected void onPreExecute() {
this.dialog.setMessage("Loading...");
this.dialog.setCancelable(false);
this.dialog.show();
}
#Override
protected Void doInBackground(Void... params) {
try {
while (mProgressStatus < 100) {
mProgressStatus = webview.getProgress();
}
} catch (Exception e) {
}
return null;
}
protected void onPostExecute(Void result) {
if (this.dialog.isShowing()) {
this.dialog.dismiss();
}
}
}
thanks for the answers. It helped me, but I had to improve it a bit for my needs. I had several pagestarts and finishes so I added a timer which checks if atfer the pagefinish is started a new pagestart. Okay, bad explanation. See the code :)
myWebView.setWebViewClient(new WebViewClient() {
boolean loadingFinished = true;
boolean redirect = false;
long last_page_start;
long now;
// Load the url
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (!loadingFinished) {
redirect = true;
}
loadingFinished = false;
view.loadUrl(url);
return false;
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
Log.i("p","pagestart");
loadingFinished = false;
last_page_start = System.nanoTime();
show_splash();
}
// When finish loading page
public void onPageFinished(WebView view, String url) {
Log.i("p","pagefinish");
if(!redirect){
loadingFinished = true;
}
//call remove_splash in 500 miSec
if(loadingFinished && !redirect){
now = System.nanoTime();
new android.os.Handler().postDelayed(
new Runnable() {
public void run() {
remove_splash();
}
},
500);
} else{
redirect = false;
}
}
private void show_splash() {
if(myWebView.getVisibility() == View.VISIBLE) {
myWebView.setVisibility(View.GONE);
myWebView_splash.setVisibility(View.VISIBLE);
}
}
//if a new "page start" was fired dont remove splash screen
private void remove_splash() {
if (last_page_start < now) {
myWebView.setVisibility(View.VISIBLE);
myWebView_splash.setVisibility(View.GONE);
}
}
});
Here's a novel method for detected when a URL has loaded by utilising Android's capability for JavaScript hooks. Using this pattern, we exploit JavaScript's knowledge of the document's state to generate a native method call within the Android runtime. These JavaScript-accessible calls can be made using the #JavaScriptInterface annotation.
This implementation requires that we call setJavaScriptEnabled(true) on the WebView's settings, so it might not be suitable depending on your application's requirements, e.g. security concerns.
src/io/github/cawfree/webviewcallback/MainActivity.java (Jelly Bean, API Level 16)
package io.github.cawfree.webviewcallback;
/**
* Created by Alex Thomas (#Cawfree), 30/03/2017.
**/
import android.net.http.SslError;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.JavascriptInterface;
import android.webkit.SslErrorHandler;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
/** An Activity demonstrating how to introduce a callback mechanism into Android's WebView. */
public class MainActivity extends AppCompatActivity {
/* Static Declarations. */
private static final String HOOK_JS = "Android";
private static final String URL_TEST = "http://www.zonal.co.uk/";
private static final String URL_PREPARE_WEBVIEW = "";
/* Member Variables. */
private WebView mWebView = null;
/** Create the Activity. */
#Override protected final void onCreate(final Bundle pSavedInstanceState) {
// Initialize the parent definition.
super.onCreate(pSavedInstanceState);
// Set the Content View.
this.setContentView(R.layout.activity_main);
// Fetch the WebView.
this.mWebView = (WebView)this.findViewById(R.id.webView);
// Enable JavaScript.
this.getWebView().getSettings().setJavaScriptEnabled(true);
// Define the custom WebClient. (Here I'm just suppressing security errors, since older Android devices struggle with TLS.)
this.getWebView().setWebViewClient(new WebViewClient() { #Override public final void onReceivedSslError(final WebView pWebView, final SslErrorHandler pSslErrorHandler, final SslError pSslError) { pSslErrorHandler.proceed(); } });
// Define the WebView JavaScript hook.
this.getWebView().addJavascriptInterface(this, MainActivity.HOOK_JS);
// Make this initial call to prepare JavaScript execution.
this.getWebView().loadUrl(MainActivity.URL_PREPARE_WEBVIEW);
}
/** When the Activity is Resumed. */
#Override protected final void onPostResume() {
// Handle as usual.
super.onPostResume();
// Load the URL as usual.
this.getWebView().loadUrl(MainActivity.URL_TEST);
// Use JavaScript to embed a hook to Android's MainActivity. (The onExportPageLoaded() function implements the callback, whilst we add some tests for the state of the WebPage so as to infer when to export the event.)
this.getWebView().loadUrl("javascript:" + "function onExportPageLoaded() { " + MainActivity.HOOK_JS + ".onPageLoaded(); }" + "if(document.readyState === 'complete') { onExportPageLoaded(); } else { window.addEventListener('onload', function () { onExportPageLoaded(); }, false); }");
}
/** Javascript-accessible callback for declaring when a page has loaded. */
#JavascriptInterface #SuppressWarnings("unused") public final void onPageLoaded() {
// Display the Message.
Toast.makeText(this, "Page has loaded!", Toast.LENGTH_SHORT).show();
}
/* Getters. */
public final WebView getWebView() {
return this.mWebView;
}
}
res/layout/activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<WebView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/webView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
Essentially, we're appending an additional JavaScript function that is used to test the state of the document. If it's loaded, we launch a custom onPageLoaded() event in Android's MainActivity; otherwise, we register an event listener that updates Android once the page is ready, using window.addEventListener('onload', ...);.
Since we're appending this script after the call to this.getWebView().loadURL("") has been made, it's probable that we don't need to 'listen' for the events at all, since we only get a chance to append the JavaScript hook by making a successive call to loadURL, once the page has already been loaded.
Just to show progress bar, "onPageStarted" and "onPageFinished" methods are enough; but if you want to have an "is_loading" flag (along with page redirects, ...), this methods may executed with non-sequencing, like "onPageStarted > onPageStarted > onPageFinished > onPageFinished" queue.
But with my short test (test it yourself.), "onProgressChanged" method values queue is "0-100 > 0-100 > 0-100 > ..."
private boolean is_loading = false;
webView.setWebChromeClient(new MyWebChromeClient(context));
private final class MyWebChromeClient extends WebChromeClient{
#Override
public void onProgressChanged(WebView view, int newProgress) {
if (newProgress == 0){
is_loading = true;
} else if (newProgress == 100){
is_loading = false;
}
super.onProgressChanged(view, newProgress);
}
}
Also set "is_loading = false" on activity close, if it is a static variable because activity can be finished before page finish.
The renderer will not finish rendering when the OnPageFinshed method is called or the progress reaches 100% so both methods don't guarantee you that the view was completely rendered.
But you can figure out from OnLoadResource method what has been already rendered and what is still rendering. And this method gets called several times.
#Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
// Log and see all the urls and know exactly what is being rendered and visible. If you wanna know when the entire page is completely rendered, find the last url from log and check it with if clause and implement your logic there.
if (url.contains("assets/loginpage/img/ui/forms/")) {
// loginpage is rendered and visible now.
// your logic here.
}
}
this will been called before he start loading the page
(and get the same parameters as onFinished())
#Override
public void onPageCommitVisible(WebView view, String url) {
super.onPageCommitVisible(view, url);
}
Loading url with SwipeRefreshLayout and ProgressBar:
UrlPageActivity.java:
WebView webView;
SwipeRefreshLayout _swipe_procesbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_url_page);
String url = "http://stackoverflow.com/";
_swipe_procesbar = (SwipeRefreshLayout)findViewById(R.id.url_path_swipe_procesbar);
_swipe_procesbar.post(new Runnable() {
#Override
public void run() {
_swipe_procesbar.setRefreshing(true);
}
}
);
webView = (WebView) findViewById(R.id.url_page_web_view);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
_swipe_procesbar.setRefreshing(false);
_swipe_procesbar.setEnabled(false);
}
});
webView.loadUrl(url);
}
activity_url_page.xml:
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/url_path_swipe_procesbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.test.test1.UrlPageActivity">
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/url_page_web_view" />
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
Here's a method which allows you to register a Runnable to be executed once a particular web address has finished loading. We associate each Runnable with a corresponding URL String in a Map, and we use the WebView's getOriginalUrl() method to choose the appropriate callback.
package io.github.cawfree.webviewcallback;
/**
* Created by Alex Thomas (#Cawfree), 30/03/2017.
**/
import android.net.http.SslError;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.webkit.SslErrorHandler;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.util.HashMap;
import java.util.Map;
/** An Activity demonstrating how to introduce a callback mechanism into Android's WebView. */
public class MainActivity extends AppCompatActivity {
/* Member Variables. */
private WebView mWebView;
private Map<String, Runnable> mCallbackMap;
/** Create the Activity. */
#Override protected final void onCreate(final Bundle pSavedInstanceState) {
// Initialize the parent definition.
super.onCreate(pSavedInstanceState);
// Set the Content View.
this.setContentView(R.layout.activity_main);
// Fetch the WebView.
this.mWebView = (WebView)this.findViewById(R.id.webView);
this.mCallbackMap = new HashMap<>();
// Define the custom WebClient. (Here I'm just suppressing security errors, since older Android devices struggle with TLS.)
this.getWebView().setWebViewClient(new WebViewClient() {
/** Handle when a request has been launched. */
#Override public final void onPageFinished(final WebView pWebView, final String pUrl) {
// Determine whether we're allowed to process the Runnable; if the page hadn't been redirected, or if we've finished redirection.
if(pUrl.equals(pWebView.getOriginalUrl())) {
// Fetch the Runnable for the OriginalUrl.
final Runnable lRunnable = getCallbackMap().get(pWebView.getOriginalUrl());
// Is it valid?
if(lRunnable != null) { lRunnable.run(); }
}
// Handle as usual.
super.onPageFinished(pWebView, pUrl);
}
/** Ensure we handle SSL state properly. */
#Override public final void onReceivedSslError(final WebView pWebView, final SslErrorHandler pSslErrorHandler, final SslError pSslError) { pSslErrorHandler.proceed(); }
});
// Assert that we wish to visit Zonal's website.
this.getWebView().loadUrl("http://www.zonal.co.uk/");
// Align a Callback for Zonal; this will be serviced once the page has loaded.
this.getCallbackMap().put("http://www.zonal.co.uk/", new Runnable() { #Override public void run() { /* Do something. */ } });
}
/* Getters. */
public final WebView getWebView() {
return this.mWebView;
}
private final Map<String, Runnable> getCallbackMap() {
return this.mCallbackMap;
}
}
Use this it should help.`var currentUrl = "google.com"
var partOfUrl = currentUrl.substring(0, currentUrl.length-2)
webView.setWebViewClient(object: WebViewClient() {
override fun onLoadResource(WebView view, String url) {
//call loadUrl() method here
// also check if url contains partOfUrl, if not load it differently.
if(url.contains(partOfUrl, true)) {
//it should work if you reach inside this if scope.
} else if(!(currentUrl.startWith("w", true))) {
webView.loadurl("www.$currentUrl")
} else if(!(currentUrl.startWith("h", true))) {
webView.loadurl("https://$currentUrl")
} else { ...}
}
override fun onReceivedSslError(view: WebView?, handler: SslErrorHandler?, error: SslError?) {
// you can call again loadUrl from here too if there is any error.
}
//You should also override other override method for error such as onReceiveError to see how all these methods are called one after another and how they behave while debugging with break point.
}
`
Kotlin solution
First Solution is create webviewclient as private class and it is more efficient.
In the other hand second soltion is sorter :)
First Solution
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val webView : WebView = findViewById(R.id.webView)
webView.webViewClient = MyWebViewClient()
}
private class MyWebViewClient : WebViewClient() {
override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
println("Load Started")
}
override fun onPageFinished(view: WebView, url: String) {
println("Load Finished")
}
}
}
Second Solution
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val webView : WebView = findViewById(R.id.webView)
webView.webViewClient = object : WebViewClient() {
override fun onPageStarted(view: WebView?, url: String?, favicon: Bitmap?) {
println("Load Started")
}
override fun onPageFinished(view: WebView, url: String) {
println("Load Finished")
}
}
}
Both solution actually same. So onPageStarted function run when page started to load in the other hang onPageFinished function works when page loaded entirely. You may want to write your as an example loadFinishedRun() function inside onPageFinished funtion.
Better late than never