我需要查看包含所有元数据的NFT-image。我决定像这样调用tokenURI（）函数，但它不起作用

private fun getNFTMetadata() = viewModelScope.launch(Dispatchers.IO){
    //tokenURI  -- by token ID
    val web3j: Web3j = createWeb3j() ?: return@launch

    var ids = listOf<Uint256>(Uint256.DEFAULT)

    val function: org.web3j.abi.datatypes.Function = org.web3j.abi.datatypes.Function(
        "tokenURI",
        ids,
        listOf()
    )

    val encodedFunction = FunctionEncoder.encode(function)
    val response: EthCall = web3j.ethCall(
        Transaction.createEthCallTransaction(WALLET_ADDRESS, CONTRACT_ADDRESS, encodedFunction),
        LATEST
    ).sendAsync().get()

    if (response.value != null){
        state.value = response.value
    } else {
        state.value = "NAN"
    }
}

private fun createWeb3j(): Web3j? {
    val webSocketService = WebSocketService(WEB_SOCKET_URL, true)
    try {
        webSocketService.connect()
    } catch (e: ConnectException) {
        e.printStackTrace()
    }
    return Web3j.build(webSocketService)
}

我真的不知道如何正确调用那个函数，请帮帮我！）