Check wether a InApp is purchased

in the app I am developing it is possible to buy additional 开发者_运维问答Features. After I uninstall the app the shared preferences are gone. How can I check wether I bought the inApp-Product after a new installation.

Thanks in advance!

You should use the Restore Transactions request to obtain information about billed items. Read more here.

you should use restore transaction.if use restore transaction it is possible but your products must be MANAGED products .for more details https://groups.google.com/forum/?fromgroups=#!topic/android-developers/sjGejJAF7FM