Samba.java

// build.gradle
// implementation 'org.apache.commons:commons-vfs2:2.2'
// implementation 'net.idauto.oss.jcifs:vfs-jcifs-ng:1.0.1'

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.VFS;
import org.apache.commons.vfs2.auth.StaticUserAuthenticator;
import org.apache.commons.vfs2.impl.DefaultFileSystemConfigBuilder;
import org.apache.poi.ss.usermodel.Cell;


import jcifs.CIFSContext;
import jcifs.config.PropertyConfiguration;
import jcifs.context.BaseContext;
import jcifs.smb.SmbAuthException;
import jcifs.smb.SmbException;


import net.idauto.oss.jcifsng.vfs2.provider.SmbFileSystemConfigBuilder;

try {
  // Configure authenticator
  BufferedInputStream in = null;
  InputStream fin = null;

  FileSystemOptions fileSystemOptions = new FileSystemOptions();
  StaticUserAuthenticator userAuthenticator = new StaticUserAuthenticator(domain, user, pass);

  // jcifs configuration
  Properties jcifsProperties = new Properties();

  // these settings are needed for 2.0.x to use anything but SMB1, 2.1.x enables by default and will ignore
  jcifsProperties.setProperty("jcifs.smb.client.enableSMB2", "true");
  jcifsProperties.setProperty("jcifs.smb.client.useSMB2Negotiation", "true");

  CIFSContext jcifsContext = new BaseContext(new PropertyConfiguration(jcifsProperties));

  SmbFileSystemConfigBuilder.getInstance().setCIFSContext(fileSystemOptions, jcifsContext);

  DefaultFileSystemConfigBuilder.getInstance()
      .setUserAuthenticator(fileSystemOptions, userAuthenticator);

  FileSystemManager fsManager = VFS.getManager();
  FileObject f = fsManager.resolveFile(path, fileSystemOptions);

  if (f.exists()) {
    fin = f.getContent().getInputStream();
    in = new BufferedInputStream(fin);
    // ...
    f.close();
    fsManager.closeFileSystem(f.getFileSystem());
  }

} catch (SmbAuthException aut) {
  this.lastError = "Error en las credenciales";
  aut.printStackTrace();
} catch(SmbException s){
    Log.d("SMB", "Code " + s.getNtStatus());
    String code = SmbException.getMessageByCode(s.getNtStatus());
    if(code.equals("0xC0000054")) {
      this.lastError = "Debe cerrar el archivo antes de proceder";
    }
}