I am new to developing android and I would like to confirm that the package name that I have picked does not conflict with any existing packages on the play store or other major apk markets.
Does such a service or website exist?!
Ideally I am expecting a website that functions similar to Gmail's email ID checking system.
In other words how to check whether a package name that I have picked is available?
Note:
I am new to developing android and I would like to confirm that the package name that I have picked does not conflict with any existing packages on the play store or other major apk markets.
If you follow the recommendations, and choose a package name based off of your domain name, you should not run into any conflicts.
Does such a service or website exist?!
To check whether your package name is in use on the Play Store, use the Play Store, with a URL of https://play.google.com/store/apps/details?id=your.package.name.goes.here.
You will need to contact the other "major apk markets" to see if they offer a similar facility. Bear in mind that asking on StackOverflow for off-site resources like this is off-topic.
Ideally I am expecting a website that functions similar to Gmail's email ID checking system.
Since a search for "email ID checking system" gmail on a major search engine turns up zero matches, I do not know what you mean by "Gmail's email ID checking system".