如何强制选择已安装的App Store？

I have Google Play, Amazon, Samsung, etc stores on a phone. I want to give the user the choice of which market to go to. If I use market, it is going to the Google Play app by default. I want a list of them to appear. Do I have to manually check which are installed and have a custom choice screen? Or can I adjust my current code:I have Google Play, Amazon, Samsung, etc stores