小编top*_*741的帖子

我正在从服务器下载一个 zip 文件到我的内部存储。它保存到/data/data/[package name]/files目录中，我可以使用 Android Studio 中的设备文件资源管理器查看它。但是当我尝试访问它以解压缩它时，出现以下错误：

java.io.FileNotFoundException: thezip.zip: open failed: ENOENT (No such file or directory)

当我打电话时：

context.getFileDir();

它给了我以下目录：

/data/user/0/[package name]/files

这是一个符号链接

/data/data/[package name]/files directory

所以我应该可以访问 zip 文件，不是吗？

我在这里缺少什么？我希望任何使用该应用程序的用户都可以访问 zip 文件夹中的文件。帮助！

编辑：这是代码：

class DownloadFileAsync extends AsyncTask<String, String, String> {
    private Context context;
    private String fileName;

    public DownloadFileAsync(Context context, String fileName){
        this.context = context;
        this.fileName = fileName;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

    }

    @Override
    protected String doInBackground(String... aurl) {
        downloadZipFile(aurl[0]);
        try {
            unzipFolder(fileName);
        } catch …

我正在尝试使用安全帽遵循此处找到的 Chainlink VRF 教程： https: //docs.chain.link/docs/intermediates-tutorial/，并在调用 rollDice 函数时遇到此问题：

Error: cannot estimate gas; transaction may fail or may require manual gas limit (error={"reason":"cannot estimate gas; transaction may fail or may require manual gas limit","code":"UNPREDICTABLE_GAS_LIMIT","method":"estimateGas","transaction":{"from":"0x014Da1D627E6ceB555975F09D26B048644382Ac6","maxPriorityFeePerGas":{"type":"BigNumber","hex":"0x9502f900"},"maxFeePerGas":{"type":"BigNumber","hex":"0x9502f90e"},"to":"0x5887946875A01D1BB79d6Fb357BceeA5A0096D2e","data":"0xdd02d9e5000000000000000000000000014da1d627e6ceb555975f09d26b048644382ac6","type":2,"accessList":null}}, tx={"data":"0xdd02d9e5000000000000000000000000014da1d627e6ceb555975f09d26b048644382ac6","to":{},"from":"0x014Da1D627E6ceB555975F09D26B048644382Ac6","type":2,"maxFeePerGas":{"type":"BigNumber","hex":"0x9502f90e"},"maxPriorityFeePerGas":{"type":"BigNumber","hex":"0x9502f900"},"nonce":{},"gasLimit":{},"chainId":{}}, code=UNPREDICTABLE_GAS_LIMIT, version=abstract-signer/5.5.0)
    at Logger.makeError (/Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/logger/src.ts/index.ts:225:28)
    at Logger.throwError (/Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/logger/src.ts/index.ts:237:20)
    at /Users/matt/Desktop/hardhat/randomDay/node_modules/@ethersproject/abstract-signer/src.ts/index.ts:301:31
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async Promise.all (index 7)

我能够部署到 Kovan 测试网，我能够验证合约，并且我已经发送了合约 LINK 代币，但仍然遇到了问题。合约可以在这里查看：https://kovan.etherscan.io/address/0x7b72d80670512c87605ab8ac7e6113fda9c57de4#code

我正在使用 Chainlink 合约 0.8 版本。

随机日.sol

pragma solidity ^0.8.9;

import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol";

contract RandomDay is VRFConsumerBase {
    
    uint256 private constant ROLL_IN_PROGRESS = …