Java android 10 创建文件的问题

Question

私有(private) boolean 值 checkPermissions() { listPermissionsNeeded = new ArrayList<>();

int permissionRead = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE);
int permissionWrite = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

if (permissionRead != PackageManager.PERMISSION_GRANTED) {
    listPermissionsNeeded.add(Manifest.permission.READ_EXTERNAL_STORAGE);
}
if (permissionWrite != PackageManager.PERMISSION_GRANTED) {
    listPermissionsNeeded.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}

if (!listPermissionsNeeded.isEmpty()) {
    ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), REQUEST_ID_MULTIPLE_PERMISSIONS);
    return false;
}
return true;

}

和

public static void parseBase64ToPDFAndNoOpen(String base64, String cardId) throws IOException {

    FileOutputStream os;
    File dwldsPath = new File(Environment.getExternalStorageDirectory() + "/" + File.separator + cardId + ".pdf");
    if (!dwldsPath.exists()) {
        dwldsPath.createNewFile();
        byte[] pdfAsBytes = Base64.decode(base64, 0);
        os = new FileOutputStream(dwldsPath, false);
        os.write(pdfAsBytes);
        os.flush();
        os.close();
    }
}

在 android 9 上一切正常，但在 andorid 10 上我有这个:java.io.IOException:权限被拒绝所有权限都已授予

Answer 1

Android 10 prohibits使用外部存储。使用 scoped storage 代替.

范围存储是应用程序目录内的文件夹