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!

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

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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