Question

I am writing a small ftp client using apache lib. I am returning list of files in ArrayList

import java.io.IOException;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;

import android.os.AsyncTask;
import android.util.Log;

public class myftpTask extends AsyncTask<String, Void, List<FTPFile>> {
    public FTPFile[] FTPFile;
    FTPClient mFtp = new FTPClient();

    @Override
    protected List<FTPFile> doInBackground(String... params) {
        List<FTPFile> myFiles = new ArrayList<FTPFile>();
        // TODO Auto-generated method stub
        try {
            mFtp.connect(params[0], 21);

            if (FTPReply.isPositiveCompletion(mFtp.getReplyCode())) {
                mFtp.login(params[1], params[2]);
                mFtp.enterLocalPassiveMode();
                mFtp.changeWorkingDirectory("/public_html");
                FTPFile files[] = mFtp.listFiles();



                for (int i = 0; i < files.length; i++) { // does not enter here
                    //Log.d("F-> " , ((FTPFile) files[i]).getName().toString());
                    //myFiles.add((FTPFile) files[i]).getName().toString());
                    myFiles.add(files[i]);
                }
                Log.v("Files", myFiles.toString());
                mFtp.disconnect();
            }
        } catch (SocketException e) {
            try {
                mFtp.disconnect();
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //return 1;
        return myFiles;

    }
}

And I am receiving it like this

import java.util.List;

import org.apache.commons.net.ftp.FTPFile;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {

    @SuppressWarnings("unchecked")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ListView lv = (ListView) findViewById(R.id.listView1);

        List<FTPFile> listofFiles;

        listofFiles = (List<FTPFile>) new myftpTask().execute(
                "*****", "*****", "******");

        ArrayAdapter<FTPFile> arrayAdapter = new ArrayAdapter<FTPFile>(this,
                android.R.layout.simple_list_item_1, listofFiles);
        lv.setAdapter(arrayAdapter);
    }



}

But it throwing an exception of cannot cast to list.

Where is the problem?

Regards

Answer 1

does this compile

 listofFiles = (List<FTPFile>) new myftpTask().execute(
                "*****", "*****", "******");

???

newmyftpTask().execute(); returns object from this type AsyncTask<String, Void, List<FTPFile>>

use this instead

 listofFiles = (List<FTPFile>) new myftpTask().execute(
                    "*****", "*****", "******").get();