文件系统异常(文件系统异常：无法打开文件，路径 = 'file.txt'(操作系统错误：没有此类文件或目录，errno = 2))

Question

readLrTime() async {
Directory fileDic = await getApplicationDocumentsDirectory();
String filePath = fileDic.path;
File file = File("$filePath/file.txt");
var lines = await file.readAsLines();
var mylrTime = lines[0];
return mylrTime;
}

这是我的代码，我遇到这个错误

FileSystemException (FileSystemException: Cannot open file, path = 'file.txt' (OS Error: No such file or directory, errno = 2))

Answer 1

检查是否在android manifest文件中添加了读写权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application...