Copy/Paste clipboard only works 1 way Linux to Android about avnc

[gujjwal00]

Thanks for the detailed report @seancrowe.

Ideally, it should work both ways. But there were some changes in Android 12 related to clipboard access, and those might be the issue here. I did some limited testing only with an emulator.

I will take a closer look.

[gujjwal00]

I can't find a real Android 12 device for now. But I tried again with emulator and copy-past works reliably in both directions.

Just to give more context, this is how clipboard access works in AVNC:

• Host -> Client: When text is received from host, it is immediately placed on Android's clipboard.
• Client -> Host: Because AVNC will be in background when you copy some text in some other app, It will check the clipboard when it comes to foreground (i.e. onResume). If text is found on clipboard, it will be sent to the server. On Android 12, you will sometimes see a toast AVNC pasted from you clipboard when AVNC comes to foreground.

Can you please test the following:

1. Copy some text on Android before connecting to server. Now connect and check if text is properly pasted on server.
2. After connecting in AVNC, switch to another app (e.g. Messaging), copy something, and switch back to AVNC. Check the clipboard on server. Disconnect from server by pressing Back. Tap on top Address/URL bar in AVNC, and try to paste the text.

[gujjwal00]

Any update @seancrowe?

[gujjwal00]

Because I cannot reproduce the issue, and there is no progress here, I am closing this.

But, feel free to reopen if you want.

[seancrowe]

@gujjwal00
Sorry, I was busy. Thanks for getting back to me.

Indeed I did your test:

• Copy some text on Android before connecting to server. Now connect and check if text is properly pasted on server.
  -- Works, this works
• After connecting in AVNC, switch to another app (e.g. Messaging), copy something, and switch back to AVNC. Check the clipboard on server. Disconnect from server by pressing Back. Tap on top Address/URL bar in AVNC, and try to paste the text.
  -- This also works

So it only works when I copy before launching the VNC session.

The weird thing is I can have a VNC session launched and another app open side by side, and the copy/paste does not work from Android -> Host.

At least now I have a workaround. I don't do a lot of copy/paste

[gujjwal00]

Yes, AVNC doesn't actively listen for clipboard changes. If you are using multiple apps side-by, try tapping on AVNC after copying from other app.

It is possible to register a clipboard listener, but I didn't want to read clipboard while in background due to privacy concerns.

[gujjwal00]

This should be fixed now in 71f84b5