Android- Webview onPageFinished Called Twice

Question

I have an activity that does OAuth authentication by intercepting the redirect url once it show up in the webview. However, the onPageFinished function is somehow called twi

Answer 1

I'm looking into an event where m.yotube.com triggers two onPageFinished events but it does not seem like caused by redirection to me. After some studies I found that there is one extra onPageFinished triggered by didFinishNavigation before the one triggered by didStopLoading which other pages also receives.

See also:

https://chromium.googlesource.com/chromium/src.git/+/master/android_webview/java/src/org/chromium/android_webview/AwWebContentsObserver.java

    @Override
    public void didFinishNavigation(final String url, boolean isInMainFrame, boolean isErrorPage,
            boolean hasCommitted, boolean isSameDocument, boolean isFragmentNavigation,
            Integer pageTransition, int errorCode, String errorDescription, int httpStatusCode) {
        ...
        if (client != null && isFragmentNavigation) {
            client.getCallbackHelper().postOnPageFinished(url);
        }
    }

    @Override
    public void didStopLoading(String validatedUrl) {
        if (validatedUrl.length() == 0) validatedUrl = ContentUrlConstants.ABOUT_BLANK_DISPLAY_URL;
            AwContentsClient client = getClientIfNeedToFireCallback(validatedUrl);
        if (client != null && validatedUrl.equals(mLastDidFinishLoadUrl)) {
            client.getCallbackHelper().postOnPageFinished(validatedUrl);
        mLastDidFinishLoadUrl = null;
        }
    }

Another instance I receive extra onPageFinished calls (even before onPageStarted!) is when I utilize webview.restoreState() in Fragments. it fires two onPageFinished events when trying to resume last viewed page.