solidity 5.2 转账函数transfer报错

[虚竹777777]

solidity 5.2 转账函数transfer报以下错误，send函数也是报错，请问怎么解决?
browser/test.sol:12:10: TypeError: Member "transfer" not found or not visible after argument-dependent lookup in address.

pragma solidity ^0.5.2;
contract test{
    address owner;
    function getStr(address add) public view returns(bool){
        if(add ==address(0)) return false;
        return add.balance > 2000000000000000000;
    }
     constructor() public{
         owner = msg.sender;
    }
     function Send() payable public{
         owner.transfer(msg.value); 
   }

}

[飞起航]

address类型有两种

address: Holds a 20 byte value (size of an Ethereum address).
address payable: Same as address, but with the additional members transfer and send.

参考资料：https://solidity.readthedocs.io/en/develop/types.html#address

pragma solidity ^0.5.2;
contract test{
    address payable owner;
    function getStr(address add) public view returns(bool){
        if(add ==address(0)) return false;
        return add.balance > 2000000000000000000;
    }
     constructor() public{
         owner = msg.sender;
    }
     function Send() payable public{
         owner.transfer(msg.value); 
   }
 
}

[飞起航]

pragma solidity ^0.5.2; contract test{ address <span style="color: #FF0000;">payable</span> owner; function getStr(address add) public view returns(bool){ if(add ==address(0)) return false; return add.balance > 2000000000000000000; } constructor() public{ owner = msg.sender; } function Send() payable public{ owner.transfer(msg.value); } }

[飞起航]

pragma solidity ^0.5.2; contract test{ address payable owner; function getStr(address add) public view returns(bool){ if(add ==address(0)) return false; return add.balance > 2000000000000000000; } constructor() public{ owner = msg.sender; } function Send() payable public{ owner.transfer(msg.value); } }

[虚竹777777]

引用 3 楼 fei_qihang 的回复:

pragma solidity ^0.5.2;
contract test{
address payable owner;
function getStr(address add) public view returns(bool){
if(add ==address(0)) return false;
return add.balance > 2000000000000000000;
}
constructor() public{
owner = msg.sender;
}
function Send() payable public{
owner.transfer(msg.value);
}

}

谢谢