Put unregister volume receiver in try-catch block

[manvi-ivnam]

Hello!
It's a fix for issue #49 .
When back button is pressed, onHostDestroy method is called.
Inside the method we can see line
mContext.unregisterReceiver(volumeBR);
and it's ok, but if we want to launch an app again and try to call setVolume method, we get an IllegalArgumentException, because the first line of setVolume method is
mContext.unregisterReceiver(volumeBR);
and it's an attempt to unregister an already unregistered instance of the receiver.
I put the line in the try-catch block to fix the issue.

[c19354837]

Thanks for your PR.

And some people have meet this problem, while I cannot reproduce it by example.

When I press back, onHostDestroy will not be call, and app just turn into background. Any idea?

[manvi-ivnam]

I looked at how a similar thing is implemented here and here, and I saw that operations with receivers are implemented in onHostPause and onHostResume methods.
If you agree, I can do something like that, so far only about the volume.

[c19354837]

That would be great!

[manvi-ivnam]

Done. I also removed the mContext.removeLifecycleEventListener(this); line from the onHostDestroy (need to think about where to place it correctly), because on some devices the method works and after returning to the application it's impossible to listen lifecycle events. And this is necessary, because onHostResume and onHostPause method work on any android device unlike onHostDestroy. Do you have any questions?

[c19354837]

Thanks for your work. I'll test it later.

I haven't found a device which can reproduce this problem, so I just make sure it works in my phone.

[manvi-ivnam]

I created a repo with a description of the algorithm for reproducing the error. Try it, maybe you can reproduce this way.

[c19354837]

Thank you for such a wonderful contribution!

I've published V1.5.3.

I reproduce it by your repo, and when I'm ready to find out some differences between your repo and my example, the example reproduces too. What a strange thing!

[manvi-ivnam]

I'm glad to help!

Yes, strange things happen...:)