Android APIv29 FileNotFoundException EACCES(权限被拒绝)

构建targetSdkVersion v29时无法访问存储.

I'm not able to access storage when building for targetSdkVersion v29.

这是我的gradle配置:

Here is my gradle configuration:

    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    ...
        minSdkVersion 15
        targetSdkVersion 29

请注意，为targetSdkVersion 28进行构建时，已授予WRITE_EXTERNAL_STORAGE权限，并且相同的设置也可以正常工作.

NOTE that WRITE_EXTERNAL_STORAGE permission is granted and the same setup works fine when building for targetSdkVersion 28.

这是我的实现方式

        val outputFolder = File(baseFolder + File.separator + "Output Folder")
        if (!outputFolder.exists()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                Files.createDirectory(outputFolder.toPath()) //This allways returns false with targetSdkVersion 29
            } else {
                if (!outputFolder.mkdirs()) {
                    Log.e("SaveRaw", "Unable to create folder for audio recording")
                }
            }
        }

        outputFile = File("$baseFolder/Output Folder/$filename")
        try {
            fileOutputStream = FileOutputStream(outputFile)
        } catch (e: FileNotFoundException) {
            e.printStackTrace() // allways throwing exception here, even if Output Folder exists 
        }

这是一个例外:

W/System.err: java.io.FileNotFoundException: /storage/emulated/0/Chirp Auto Tester/2019_10_17 10:44:43.raw: open failed: EACCES (Permission denied)
W/System.err:     at libcore.io.IoBridge.open(IoBridge.java:496)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:235)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:186)

希望任何人都有答案，我在这里想念什么?

Hope anyone has an answer, what am I missing here?

更新:

这是baseFolder的来源.请注意，getExternalStorageDirectory是已弃用的方法.

Here is where baseFolder comes from. Note that getExternalStorageDirectory is a deprecated method.

        val baseFolder: String = if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            Environment.getExternalStorageDirectory().absolutePath
        } else {
            context.filesDir.absolutePath
        }

谢谢