Android evaluateJavaScript() problem

[Dean Wedel]

In the Android code I'm trying to get Tab.getWebContents().evaluateJavaScript() to work.

Here is what I have:

1. I selected this tab-observer in file src/chrome/browser/tab/java/src/org/chromium/chrome/browser/tab/EmptyTabObserver.java

2. Inside function public void onPageLoadFinished(Tab tab, GURL url) I added this code:

        if (url.getSpec().contains("bing.com"))
        {
            tab.getWebContents().evaluateJavaScript("(function() {" + "  alert('hello!');" + "})()", null);

        }

3. Chromium builds, installs, and runs fine on my Android Pixel. However when I navigate to bing to test this the app just crashes. This confirms that the code IS getting hit but what do I have wrong?

[Dean Wedel]

I should add that the project runs fine in that I can navigate to other webpages without any problems or crashes.

On bing it properly loads/displays the page and THEN it crashes. . . .

[Dean Wedel]

This is Chromium code base v128.0.6547.0

[Dean Wedel]

I also tried evaluating this JavaScript statement but it also just crashes:
> "history.back()"

Any ideas or advice?

[Dean Wedel]

As an experiment I've moved my code over to file:
> chrome/android/java/src/org/chromium/chrome/browser/app/ChromeActivity.java

The modification looks like this:

>                     public void onPageLoadFinished(Tab tab, GURL url) {
>+                        if (url.getSpec().contains("bing.com"))
>+                        {
>+                            tab.getWebContents().evaluateJavaScript("(function() {" + "  alert('hi!');" + "})()", null);
>+                        }
>                         postDeferredStartupIfNeeded();
>                         OfflinePageUtils.showOfflineSnackbarIfNecessary(tab);
>                     }

But the app just crashes on my Pixel when I visit "bing". . . All other webpages work fine.

Anybody have any ideas what I'm doing wrong?

[Dean Wedel]

It looks like in file: content/public/android/java/src/org/chromium/content/browser/webcontents/WebContentsImpl.java

For the implementation of "public void evaluateJavaScript(String script, JavaScriptCallback callback) {"

That the first statement is:
> ThreadUtils.assertOnUiThread();

I tried commenting-out that line but my JavaScript call still doesn't work ~ it just crashes.

[uazo]

> Any ideas or advice?

the only way to figure out why is to check the crash log.

[Dean Wedel]

uazo,

Good suggestion. I've sifted through the crash-log and I haven't been able to determine what goes wrong.

Here is a condensed version if you cared to take a look.

Thanks in advance,
Dean

[uazo]

you have to give it to "third_party/android_platform/development/scripts/stack"

for example:

third_party/android_platform/development/scripts/stack --output-directory out/x64/ ../../$TOMBSTONE >../../$TOMBSTONE.txt