"Rate This App"-link in Google Play store app on the phone

Question

I'd like to put a "Rate This App"-link in an Android App to open up the app-listing in the user's Google Play store app on their phone.

1. What code do I have to write to create the market:// or http://-link open in the Google Play store app on the phone?
2. Where do you put the code?
3. Does anyone have a sample implementation of this?
4. Do you have to specify the screen where the market:// or http:// link will be placed, and which is the best to use - market:// or http://?

Answer 1

I open the Play Store from my App with the following code:

            val uri: Uri = Uri.parse("market://details?id=$packageName")
            val goToMarket = Intent(Intent.ACTION_VIEW, uri)
            // To count with Play market backstack, After pressing back button, 
            // to taken back to our application, we need to add following flags to intent. 
            goToMarket.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY or
                    Intent.FLAG_ACTIVITY_NEW_DOCUMENT or
                    Intent.FLAG_ACTIVITY_MULTIPLE_TASK)
            try {
                startActivity(goToMarket)
            } catch (e: ActivityNotFoundException) {
                startActivity(Intent(Intent.ACTION_VIEW,
                        Uri.parse("http://play.google.com/store/apps/details?id=$packageName")))
            }