Android Question WebView Instance

Have you tried removing the webview from your activity in the activity_pause, and re-adding it in your activity_resume?

Jeffrey Cameron said:

Have you tried removing the webview from your activity in the activity_pause, and re-adding it in your activity_resume?

Click to expand...

I don't want to remove because, as I said, the background streaming activity is interesting for the times when the user wants to navigate to other activity or app maintaining a music running, for example. The problem is that the B4A triggers again the event Activity_Create after user pressed back button, for example... if the streaming was destroyed also, no problem. But the finish looks like a "partial finish" because the streaming process linked to the destroyed webview is still running - this is when the problem starts: the system will try to create other websocket which conflicts with the first one.
I did a workaround in this way:
1. Blocked back button
2. Created two buttons on screen:
- one to destroy the streaming BEFORE destroying the activity, loading a blank html page on webview (before finishing the activity, I still have the reference for its instance)
- other only starting other activity (the new one that the user wants to run), without finishing the current - so the audio stream remains... and isn't loaded again because when the user returns to the webview activity there is only a Resume event, not a Create...

This is my solution BUT I really would like to be able to destroy the streaming object attached to the webview - this should be the "perfect solution".

Thanks!

You can force the WebView to be "destroyed" with:

Call it in Activity_Pause and make sure to create a new WebView in Activity_Resume.

Erel said:

You can force the WebView to be "destroyed" with:

B4X:

Dim jo As JavaObject = WebView1
jo.RunMethod("destroy", Null)

Call it in Activity_Pause and make sure to create a new WebView in Activity_Resume.

Click to expand...

Thanks @Erel . Like I told to @Jeffrey Cameron , it's interesting to have the streaming working in background when the user navigates to other activities (and the streaming is generated dynamically by site, then it's not possible to connect directly). Then, could be very useful if I could:

1. Check if the webview instace is active - then, I could to test in _Resume and avoid to load one more if is still running and...
2. Destroy the instance outside the parent activity: maintaining, for example, a floating window (overlay window) where user could stop the streaming... this window could be showed when parent activity is paused and closed when opened or the webview instance is closed.

To do this, I need to be able to reference the webview outside the parent activity and check if it's running or not. Referencing that with javaobject could be useful if could be done in this way:
1. Create webview dinamically from Process_Global (then, the object will be valid in the entire app process and will be unique
2. Load and unload in activity dynamically also...

I'm not sure if you understood but I think that this is the best solution... any suggestion?

In that case it will be easier to create your app with a single activity. You can use TabStripViewPager or something else instead of multiple activities.