Chromium Android WebView and permissions (Geolocation, Speech, UseMedia, ...)

[Iker Jamardo]

Hello,

I am building Chromium tag 57.0.2987.5 for Android in the webview form. In the AwShellActivity I am adding the command line flag for activating the speech recognition API:

        CommandLine.init(new String[] { "chrome", "--ignore-gpu-blacklist", "--enable-blink-features=ScriptedSpeech" });

This works and I am able to get the webkitSpeechRecognition type in my HTML page as expected. But I cannot get it to work. I am not able to get any of the callbacks (onresult, onerror, ...) to be called.

My initial guess is that permission needs to be provided. I have enabled the required permissions in the Manifest and requested permissions in the Java code. I also guessed that maybe a onPermissionRequest callback should be implemented granting the permission. but nothing seems to work. I have also tested the Geolocation API and I am not able to make it work either.

Are there any limitation in the WebView "flavor" of Chromium regarding these APIs (Geo, Speech, Media, ...)?

Thank you very much in advance.

[PhistucK]

Geolocation and speech stuff require API keys (and as far as I remember, are generally unavailable in WebView as a result). Have you supplied those?

https://www.chromium.org/developers/how-tos/api-keys

☆PhistucK

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[Iker Jamardo]

Thank you, did not know about this.

What is the easiest way to resolve this? Can I provide the same keys that other "flavors" of Chromium (chrome_public_apk or content_shell_apk) provide somehow to the android_webview_apk compilation?

Regards,

Iker.

[Torne (Richard Coles)]

Webview doesn't need any API keys. Geolocation just calls the platform geolocation APIs and this has worked since the beginning of android, so if that doesn't work for you then I think you're doing something wrong. I'm not sure what the status of the speech API is.

☆PhistucK

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[Iker Jamardo]

Thank you for your feedback Torne, but when I mention the WebView, I mean compiling Chromium with the android_webview_apk target/type (just to confirm). I might be doing something wrong but I cannot seem to be able to make it work and I do not get the callbacks to be called.

Regards,

Iker.

☆PhistucK

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[Torne (Richard Coles)]

All web features should work exactly the same in android_webview_apk as in the actual system webview; the differences are all in how it's hooked up to the embedding application in Java. Geolocation definitely should work.

☆PhistucK

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[Bo Liu]

Did you implement onGeolocationPermissionsShowPrompt? android_webview_apk uses NullContentsClient by default I believe, which is a no-op.

☆PhistucK

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[Iker Jamardo]

You are right, I was not handling the request to enable the location correctly in the onGeolocationPermissionsShowPrompt and now I get the location callback. Thank you.

Still, for the Speech API, I cannot seem to get it to work. Should I get the onPermissionRequest call for that one? The API in JS has been enabled (window.webkitSpeechRecognition exists) but callbacks are not being fired.

Thank you very much for all your responses and help. 

Regards,

Iker.

[Iker Jamardo]

Ok, also added a test for getUserMedia. I finally get a call to onPermissionRequest for this one and correctly requesting the permissions allows me to use it (I can see the video feed and the audio recording).

Still no luck with the speech recognition API. I do not get a call for onPermissionRequest for this one (do not know if that is what is expected).

Regards,

Iker.

[PhistucK]

See crbug.com/487255, looks like it is not supported.

☆PhistucK

[Torne (Richard Coles)]

Enabling the speech api in blink won't do anything useful: it's calling into higher level interfaces which are just not implemented in WebView. Blink only implements the API, not the actual speech recognition.

☆PhistucK

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[Iker Jamardo]

Thank you. Found that crbug page but the last comments in it plus being able to enable the js API at least got me confused.

Regards,

Iker