mint

[NickRibbon]

public boolean mintNFTByAmount(Web3j web3j, String contractAddress, int amount) {
if (web3j == null) return false;
String methodName = "mint";
String fromAddr = emptyAddress;
Function function = new Function(
methodName,
Arrays.asList(new Uint256(amount)),
Arrays.asList(new TypeReference() {
}));

    String data = FunctionEncoder.encode(function);
    Transaction transaction = Transaction.createEthCallTransaction(fromAddr, contractAddress, data);

    EthCall ethCall;
    try {
        ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).sendAsync().get();
        //List<Type> results = FunctionReturnDecoder.decode(ethCall.getValue(), function.getOutputParameters());
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
    }
    return true;
}


/**
 * 调用NFT的Mint方法根据合约有两种
 * Function: mint(address _to, uint256 _mintAmount)
 ***/
public  boolean mintNFTByAmountAndAddress(Web3j web3j, Credentials credentials, String contractAddress, int amount) {
    if (web3j == null) return false;
    if (credentials == null) return false;
    String methodName = "mint";
    String fromAddr = emptyAddress;
    Function function = new Function(
            methodName,
            Arrays.asList(new Address(credentials.getAddress()), new Uint256(amount)),
            Arrays.asList(new TypeReference<Type>() {
            }));

    String data = FunctionEncoder.encode(function);
    Transaction transaction = Transaction.createEthCallTransaction(fromAddr, contractAddress, data);

    EthCall ethCall;
    try {
        ethCall = web3j.ethCall(transaction, DefaultBlockParameterName.LATEST).sendAsync().get();
        //List<Type> results = FunctionReturnDecoder.decode(ethCall.getValue(), function.getOutputParameters());
    } catch (InterruptedException | ExecutionException e) {
        e.printStackTrace();
    }
    return true;
}

have some problem for contract 721