This question already has answers here:
Opening webview not in new browser
(9 answers)
Closed 7 years ago.
Activity.java code:
package net.pocketcraftgaming.pocketcraftgaming;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebView;
import android.view.Menu;
import android.view.MenuItem;
public class WebMainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_main);
String url ="http://www.pocketcraftgaming.net/";
WebView view =(WebView) this.findViewById(R.id.webView);
view.getSettings().setJavaScriptEnabled(true);
view.loadUrl(url);
}
}
Tell me if I need to show my AndroidManifest.xml or activity.xml
please reply soon!
In case you are not bound to only webview, you can have a look into this.
Chrome Custom Tab
Here you can find more about Custom Tab.
You have to set up WebViewClient . Add this:
this.mWebView.setWebViewClient(new WebViewClient(){
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url){
view.loadUrl(url);
return true;
}
});
Try this way.
put this in oncreate method.
String URL ="http://www.pocketcraftgaming.net/";
if (URL.startsWith("http://")) {
} else {
URL = "http://" + getIntent().getStringExtra("WebUrl").trim();
}
// this is method.
LoadURLinWebView(URL);
this is Load URL method.
private void LoadURLinWebView(String uRL2) {
// TODO Auto-generated method stub
WebView Wv_onlywebview =(WebView) this.findViewById(R.id.Wv_onlywebview);
Wv_onlywebview.getSettings().setJavaScriptEnabled(true);
Wv_onlywebview.setWebChromeClient(new WebChromeClient());
Wv_onlywebview.setWebViewClient(new WebViewClient() {
ProgressDialog progressDialog;
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
// Show loader on url load
public void onLoadResource(WebView view, String url) {
if (progressDialog == null) {
progressDialog = new ProgressDialog(
Webview_Only_Activity.this);
progressDialog.show();
} else {
progressDialog.dismiss();
}
}
public void onPageFinished(WebView view, String url) {
if (progressDialog.isShowing()) {
progressDialog.dismiss();
progressDialog = null;
}
}
});
Wv_onlywebview.loadUrl(uRL2);
}
try this
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));
startActivity(browserIntent);
I’m trying to override url loading when clicking on a link on an app WebView.
The page loads but the WebView will keep it’s last scroll position and content size.
Is there some parameter I forgot to set on the WebView to reset the content size and the scroll position on next load?
Here’s how I’m using it:
#SuppressLint("SetJavaScriptEnabled")
#AfterViews
protected void afterViews() {
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebClient());
webView.setWebChromeClient(new ChromeClient());
webView.loadUrl(url);
}
public class WebClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
boolean isValidEmail = url.startsWith("mailto:") && Patterns.EMAIL_ADDRESS.matcher(url.substring("mailto:".length())).matches();
boolean isValidPhone = url.startsWith("tel:") && Patterns.PHONE.matcher(url.substring("tel:".length())).matches();
if (url.startsWith("about:")) {
return super.shouldOverrideUrlLoading(view, url);
}
if (isValidEmail) {
Intent sendIntent = new Intent(Intent.ACTION_SENDTO, Uri.parse(url));
startActivity(Intent.createChooser(sendIntent, ""));
} else {
if (isValidPhone) {
Intent dialIntent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
startActivity(Intent.createChooser(dialIntent, ""));
} else {
WebViewActivity.this.setPageTitle(url);
webView.loadUrl(url);
}
}
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
//..
}
}
public class ChromeClient extends WebChromeClient {
#Override
public void onProgressChanged(WebView view, int progress) {
//...
}
}
Thanks.
Did you try to set scroll position in onPageFinished?
#Override
public void onPageFinished(WebView view, String url) {
// other code...
view.scrollTo(0,0);
}
That should set WebView content back to top, and not on old scroll position
Edit 1:
Sometimes if the page loads for a long time this won't work properly, so we must wait for page to get fully loaded:
#Override
public void onPageFinished(WebView view, String url) {
view.postDelayed(new Runnable() {
#Override
public void run() {
webView.scrollTo(0, 0);
}
// Delay the scrollTo to make it work
}, 300);
}
Please note that webView this time is not the WebView from the method onPageFinished, but the WebView fetched from the layout (same one as in afterViews() method).
#Bojan Kopanja, my sincere apologies for misleading.
It turns out I had the webview inside a pull to refresh listener with a scrollview and removing that got rid of the problem.
Thanks for your help nevertheless.
I have a real big problem implementing loading a intent from inside shouldOverrideUrlLoading.
I believe it has to do with the way i have structured my application.
Here is my code:
VariablesStorage.class
public class VariablesStorage
{
private static VariablesStorage instance;
public static Context webViewContext;
public WebView webView;
public static void initInstance()
{
if (instance == null)
{
// Create the instance
instance = new VariablesStorage();
}
}
public static VariablesStorage getInstance()
{
// Return the instance
return instance;
}
private VariablesStorage()
{
}
public void loadWebView() {
webView.getSettings().setJavaScriptEnabled(true);
if (isOnline())
{
webView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("inapp://")) {
Intent intent = new Intent(this,profilepictureview.class);
intent.putExtra("img",Uri.parse(url).getHost().toString());
startActivity(intent);
}else
{
view.getContext().startActivity(
new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
}
return true;
}
#Override
public void onReceivedError( WebView view, int errorCode, String description, String failingUrl)
{
}
#Override
public void onPageFinished(WebView view, String url) {
if(mProgress.isShowing()) {
mProgress.dismiss();
}
}
});
webView.loadUrl(Url);
}else
{
webView.loadData(customHtml, "text/html;charset=utf-8", "UTF-8");
}
}
}
and my webview activity where i call VariablesStorage.getInstance().loadWebView();
WebViewActivity.class
public class WebViewActivity extends Activity {
SharedPreferences pref;
TextView textView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.webviewtab);
VariablesStorage.getInstance().webViewContext = this;
VariablesStorage.getInstance().webView = (WebView) findViewById(R.id.webView);
VariablesStorage.getInstance().loadWebView();
}
So when i am adding this code inside shouldOverrideUrlLoading
Intent intent = new Intent(this,profilepictureview.class);
intent.putExtra("img",Uri.parse(url).getHost().toString());
startActivity(intent);
i am getting this error:
The constructor Intent(new WebViewClient(){}, Class<profilepictureview>) is undefined
Any help implementing this one?
Thanks.
As the error says, Intent doesn't have a constructor that takes WebViewClient(){} as a parameter which is what this is referring to in this situation. See Intent Constructors
What you probably want is
Intent intent = new Intent(webViewContext,profilepictureview.class);
but you will want to initialize webViewContext first.
Edit
startActivity also, needs a Context. Try this
webViewContext.startActivity(intent);
Keeping a static reference to an activity's context is going to cause you problems. All views (including WebView) have getContext(), so use view.getContext() rather than 'this' or 'webViewContext' when creating the Intent.
Also, you're trying to start an activity named 'profilepictureview', which sounds more like a View rather than an Activity?
I want to get a return value from Javascript in Android. I can do it with the iPhone, but I can't with Android. I used loadUrl, but it returned void instead of an object. Can anybody help me?
Same as Keith but shorter answer
webView.addJavascriptInterface(this, "android");
webView.loadUrl("javascript:android.onData(functionThatReturnsSomething)");
And implement the function
#JavascriptInterface
public void onData(String value) {
//.. do something with the data
}
Don't forget to remove the onData from proguard list (if you have enabled proguard)
Here's a hack on how you can accomplish it:
Add this Client to your WebView:
final class MyWebChromeClient extends WebChromeClient {
#Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
Log.d("LogTag", message);
result.confirm();
return true;
}
}
Now in your javascript call do:
webView.loadUrl("javascript:alert(functionThatReturnsSomething)");
Now in the onJsAlert call "message" will contain the returned value.
Use addJavascriptInterface() to add a Java object to the Javascript environment. Have your Javascript call a method on that Java object to supply its "return value".
Here's what I came up with today. It's thread-safe, reasonably efficient, and allows for synchronous Javascript execution from Java for an Android WebView.
Works in Android 2.2 and up. (Requires commons-lang because I need my code snippets passed to eval() as a Javascript string. You could remove this dependency by wrapping the code not in quotation marks, but in function(){})
First, add this to your Javascript file:
function evalJsForAndroid(evalJs_index, jsString) {
var evalJs_result = "";
try {
evalJs_result = ""+eval(jsString);
} catch (e) {
console.log(e);
}
androidInterface.processReturnValue(evalJs_index, evalJs_result);
}
Then, add this to your Android activity:
private Handler handler = new Handler();
private final AtomicInteger evalJsIndex = new AtomicInteger(0);
private final Map<Integer, String> jsReturnValues = new HashMap<Integer, String>();
private final Object jsReturnValueLock = new Object();
private WebView webView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
webView = (WebView) findViewById(R.id.webView);
webView.addJavascriptInterface(new MyJavascriptInterface(this), "androidInterface");
}
public String evalJs(final String js) {
final int index = evalJsIndex.incrementAndGet();
handler.post(new Runnable() {
public void run() {
webView.loadUrl("javascript:evalJsForAndroid(" + index + ", " +
"\"" + StringEscapeUtils.escapeEcmaScript(js) + "\")");
}
});
return waitForJsReturnValue(index, 10000);
}
private String waitForJsReturnValue(int index, int waitMs) {
long start = System.currentTimeMillis();
while (true) {
long elapsed = System.currentTimeMillis() - start;
if (elapsed > waitMs)
break;
synchronized (jsReturnValueLock) {
String value = jsReturnValues.remove(index);
if (value != null)
return value;
long toWait = waitMs - (System.currentTimeMillis() - start);
if (toWait > 0)
try {
jsReturnValueLock.wait(toWait);
} catch (InterruptedException e) {
break;
}
else
break;
}
}
Log.e("MyActivity", "Giving up; waited " + (waitMs/1000) + "sec for return value " + index);
return "";
}
private void processJsReturnValue(int index, String value) {
synchronized (jsReturnValueLock) {
jsReturnValues.put(index, value);
jsReturnValueLock.notifyAll();
}
}
private static class MyJavascriptInterface {
private MyActivity activity;
public MyJavascriptInterface(MyActivity activity) {
this.activity = activity;
}
// this annotation is required in Jelly Bean and later:
#JavascriptInterface
public void processReturnValue(int index, String value) {
activity.processJsReturnValue(index, value);
}
}
On API 19+, the best way to do this is to call evaluateJavascript on your WebView:
webView.evaluateJavascript("foo.bar()", new ValueCallback<String>() {
#Override public void onReceiveValue(String value) {
// value is the result returned by the Javascript as JSON
}
});
Related answer with more detail: https://stackoverflow.com/a/20377857
The solution that #Felix Khazin suggested works, but there is one key point missing.
The javascript call should be made after the web page in the WebView is loaded. Add this WebViewClient to the WebView, along with the WebChromeClient.
Full Example:
#Override
public void onCreate(Bundle savedInstanceState) {
...
WebView webView = (WebView) findViewById(R.id.web_view);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new MyWebViewClient());
webView.setWebChromeClient(new MyWebChromeClient());
webView.loadUrl("http://example.com");
}
private class MyWebViewClient extends WebViewClient {
#Override
public void onPageFinished (WebView view, String url){
view.loadUrl("javascript:alert(functionThatReturnsSomething())");
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
}
private class MyWebChromeClient extends WebChromeClient {
#Override
public boolean onJsAlert(WebView view, String url, String message, JsResult result) {
Log.d("LogTag", message);
result.confirm();
return true;
}
}
As an alternative variant that uses a custom scheme to communicate Android native code <-> HTML/JS code. for example MRAID uses this technic[About]
MainActivity
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
WebView.setWebContentsDebuggingEnabled(true);
}
final WebView webview = new CustomWebView(this);
setContentView(webview);
webview.loadUrl("file:///android_asset/customPage.html");
webview.postDelayed(new Runnable() {
#Override
public void run() {
//Android -> JS
webview.loadUrl("javascript:showToast()");
}
}, 1000);
}
}
CustomWebView
public class CustomWebView extends WebView {
public CustomWebView(Context context) {
super(context);
setup();
}
#SuppressLint("SetJavaScriptEnabled")
private void setup() {
setWebViewClient(new AdWebViewClient());
getSettings().setJavaScriptEnabled(true);
}
private class AdWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url.startsWith("customschema://")) {
//parse uri
Toast.makeText(CustomWebView.this.getContext(), "event was received", Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
}
}
customPage.html (located in the assets folded)
<!DOCTYPE html>
<html>
<head>
<title>JavaScript View</title>
<script type="text/javascript">
<!--JS -> Android-->
function showToast() {
window.location = "customschema://goto/";
}
</script>
</head>
<body>
</body>
</html>
You can do it like this:
[Activity(Label = "#string/app_name", Theme = "#style/AppTheme", MainLauncher = true)]
public class MainActivity : AppCompatActivity
{
public WebView web_view;
public static TextView textView;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
Window.AddFlags(WindowManagerFlags.Fullscreen);
Window.ClearFlags(WindowManagerFlags.ForceNotFullscreen);
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.main);
web_view = FindViewById<WebView>(Resource.Id.webView);
textView = FindViewById<TextView>(Resource.Id.textView);
web_view.Settings.JavaScriptEnabled = true;
web_view.SetWebViewClient(new SMOSWebViewClient());
web_view.LoadUrl("https://stns.egyptair.com");
}
public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
Xamarin.Essentials.Platform.OnRequestPermissionsResult(requestCode, permissions, grantResults);
base.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
public class SMOSWebViewClient : WebViewClient
{
public override bool ShouldOverrideUrlLoading(WebView view, IWebResourceRequest request)
{
view.LoadUrl(request.Url.ToString());
return false;
}
public override void OnPageFinished(WebView view, string url)
{
view.EvaluateJavascript("document.getElementsByClassName('notf')[0].innerHTML;", new JavascriptResult());
}
}
public class JavascriptResult : Java.Lang.Object, IValueCallback
{
public string Result;
public void OnReceiveValue(Java.Lang.Object result)
{
string json = ((Java.Lang.String)result).ToString();
Result = json;
MainActivity.textView.Text = Result.Replace("\"", string.Empty);
}
}
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