how to convert URI into Bip21 i am trying to convert the 


  URI into BIP21


currently i am generating URI from bitcoinj library, but i want it to be on BIP21 Standard. i have read many articles but didn't found any solution
The source file for that method is here  

BIP21 wiki

Method can be accessed like this  

 String bitcoinURI = BitcoinURI.convertToBitcoinURI(String address, Coin amount, String label, String message);