WebView with Toga doesn't run JavaScript on android but yes on Windows

[danielmedinaa]

I'm working on a WebView in python which should display a web page and it does it correctly, the issue is that in android the web page does not execute the JavaScript code that is on the page, also if I add one with invoke_javascript, this is only on android, on windows it does it without any problem.

[freakboy3742]

I presume this is on Toga 0.3.1? I can't say I've seen this myself, and in the main branch we've got tests that validate that Javascript is executing. Are you able to test this on the main branch? To do this, replace the reference to toga-android==0.3.1 with:

requires = [
    "git+https://github.com/beeware/toga.git#subdirectory=core",
    "git+https://github.com/beeware/toga.git#subdirectory=android",
]

[danielmedinaa]

Thanks for replying!, I did that and it opens perfect but the JavaScript code still doesn't work, I'm using the apk directly, the I know that generates with briefcase build android, does that affect? Do I have to use Briefcase Package Android and use the AAB?

[danielmedinaa]

The button works everywhere 100% even in toga but in windows, both running briefcase dev and in the exe, there everything works 100%, the problem is in the apk

[mhsmith]

OK, but you didn't answer either of the questions in my previous comment.

[danielmedinaa]

Is it a button within a web page?
Answer: Yes.
Does the same problem occur when using that web page in a regular Android browser?
Answer: No

[mhsmith]

If you need help with that, please post the HTML of the page, or preferably a simple example that reproduces the same problem.

[danielmedinaa]

Exactly, I noticed the error here:

that's the

[danielmedinaa]

button.zip

[mhsmith]

It looks like displaying a file picker from a WebView requires subclassing the WebChromeClient class. I'll add a note about this to #1020. Unfortunately I don't have any workaround at the moment.

[danielmedinaa]

Thank you!, another little thing and sorry for so many questions, is it possible to request permissions and runtime?? For example, android.permission.MANAGE_EXTERNAL_STORAGE?? Since a version of my APK needs to interact to read a txt file with the port, then to allow the service I have to do it manually and it is tedious for the users who are going to use it, then there is some way to request that permission but before the app opens

[freakboy3742]

Permissions like this need to be requested when building the app, so it's a feature we'd need in Briefcase, rather than Toga. At present, we don't have any mechanism to add permissions, but this is on our roadmap (see beeware/briefcase#547).

[mhsmith]

For some example code, see beeware/briefcase#1497 (reply in thread).

As well as the runtime code, you'd also need to add the permission to AndroidManifest.xml.