I'm converting a base64 file to a pdf, so first i'm converting from base64 to an array of bytes and then I write it on a FileOutputStream. My problem is when I try to store it adn then open it with pdf viewer i get this error:
Faild to generate pdf from base64: /storage/emulated/0/Download/conclusions.pdf: open failed: EACCES (Permission denied)
Also I'm giving it the necesarry permissions to work, as I use a File provider because the app works on android 11. Here is the code I use:
Activity:
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 ${e.localizedMessage}")
}
}
}
private fun getFilePath(filename: String): String {
val file =
File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).path)
if (!file.exists()) {
file.mkdirs()
}
return file.absolutePath.toString() + "/" + filename + ".pdf"
}
Android manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:name="university"
android:allowBackup="false"
android:icon="${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>
filepaths:
<?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>
