打开失败：EACCES（权限被拒绝）ANDROID 11

Question

我正在将 base64 文件转换为 pdf，所以首先我将 base64 转换为字节数组，然后将其写入 FileOutputStream。我的问题是当我尝试存储它然后用 pdf 查看器打开它时出现此错误：

 Faild to generate pdf from base64: /storage/emulated/0/Download/conclusions.pdf: open failed: EACCES (Permission denied)

我还授予它工作的必要权限，因为我使用文件提供程序，因为该应用程序在 android 11 上运行。这是我使用的代码：

活动：

private fun generatePDFFromBase64(base64: String?, fileName: String?) {
        try {
            val decodedBytes: ByteArray = Base64.decode(base64, Base64.DEFAULT)
            val fos = FileOutputStream(fileName?.let { getFilePath(it) })
            fos.write(decodedBytes)
            fos.flush()
            fos.close()

            fileName?.let { openDownloadedPDF(it) }
        } catch (e: IOException) {
            Log.e("TAG", "Faild to generate pdf from base64: ${e.localizedMessage}")
        }
    }

    private fun openDownloadedPDF(fileName: String) {
        val file = File(getFilePath(fileName))


        if (file.exists()) {

            val path: Uri = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                FileProvider.getUriForFile(requireContext(), BuildConfig.APPLICATION_ID + ".provider", file)
            } else {
                Uri.fromFile(file)
            }

            generalFile = file
            val intent = Intent(Intent.ACTION_VIEW)
            intent.setDataAndType(path, "application/pdf")
            intent.flags = Intent.FLAG_ACTIVITY_NO_HISTORY or Intent.FLAG_GRANT_READ_URI_PERMISSION
            val chooserIntent = Intent.createChooser(intent, "Open with")
            try {
                startActivity(chooserIntent)
            } catch (e: ActivityNotFoundException) {
                Log.e("TAG", "Failed to open PDF  ${e.localizedMessage}")
            }
        }
    }

    private fun getFilePath(filename: String): String {
        val file =
            File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).path)
        if (!file.exists()) {
            file.mkdirs()
        }
        return file.absolutePath.toString() + "/" + filename + ".pdf"
    }

Android 清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CALL_PHONE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <application
        android:name="university"
        android:allowBackup="false"
        android:icon="${appIcon}"
        android:roundIcon="${appIconRound}"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:hardwareAccelerated="true"
        android:theme="@style/Theme.University"
        android:usesCleartextTraffic="true">
        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true"
            tools:replace="android:authorities">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/filepaths"
                tools:replace="android:resource" />
        </provider>

文件路径：

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path
        name="external"
        path="." />
    <external-files-path
        name="external_files"
        path="." />
    <cache-path
        name="cache"
        path="." />
    <external-cache-path
        name="external_cache"
        path="." />
    <files-path
        name="files"
        path="." />
</paths>

Answer 1

打开您的应用信息应用权限在显示所有权限后单击所有权限在问题解决后单击以启用。