Re: read and show CSV-files

Tobias Wendorff wrote:


Hi Tobias,
  First let me thank you for providing me the
impetus for looking at J2ME, your OP was the
first that I've examined it - having fun!

I don't know - have you extended the MIDlet class?

Here's what I have so far - please don't use this
as a good example.

import java.io.IOException;
import java.io.InputStream;
import java.util.Vector;

import javax.microedition.io.ConnectionNotFoundException;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class ReadDisplayFile extends MIDlet
  implements CommandListener, ItemCommandListener{
  private Form mMainForm;
  private Command cmNext =
    new Command("Next", Command.SCREEN, 1);
  private Command cmExit =
    new Command("Exit", Command.EXIT, 1);
  private Command cmDial =
    new Command("Dial", Command.ITEM, 1);
  private StringItem siFirstname =
    new StringItem(null,null);
  private StringItem siSurname =
    new StringItem(null,null);
  private StringItem siStreet =
    new StringItem(null,null);
  private StringItem siPhone =
    new StringItem(null,null);
  private int nextRecord = 0;
  private int recordCount = 0;
  private String[][] records;

  public ReadDisplayFile() {
    records = splitFile();
    mMainForm = new Form("Phonebook");
    siFirstname.setText("Firstname: " +
        records[nextRecord][1] + "\n");
    siSurname.setText("Surname: " +
        records[nextRecord][0] + "\n");
    siStreet.setText("Street: " +
        records[nextRecord][2] + "\n");
    siPhone.setText("Phone: " +
        records[nextRecord][3] + "\n");
    siPhone.addCommand(cmDial);
    siPhone.setItemCommandListener(this);

    nextRecord++;

    mMainForm.append(siFirstname);
    mMainForm.append(siSurname);
    mMainForm.append(siStreet);
    mMainForm.append(siPhone);

    mMainForm.addCommand(cmNext);
    mMainForm.addCommand(cmExit);
    mMainForm.setCommandListener(this);
  }

  protected void destroyApp(boolean arg0)
    throws MIDletStateChangeException {}

  protected void pauseApp() {}

  protected void startApp()
    throws MIDletStateChangeException {
    Display.getDisplay(this).setCurrent(mMainForm);
  }

  public void commandAction(Command c, Displayable arg1)
  {
    if (c == cmNext)
    {
      if(nextRecord <= recordCount)
      {
        siFirstname.setText("Firstname: " +
            records[nextRecord][1] + "\n");
        siSurname.setText("Surname: " +
            records[nextRecord][0] + "\n");
        siStreet.setText("Street: " +
            records[nextRecord][2] + "\n");
        siPhone.setText("Phone: " +
            records[nextRecord][3] + "\n");
        nextRecord++;
      }
      else
      {
        nextRecord = 0;
        siFirstname.setText("Firstname: " +
            records[nextRecord][1] + "\n");
        siSurname.setText("Surname: " +
            records[nextRecord][0] + "\n");
        siStreet.setText("Street: " +
            records[nextRecord][2] + "\n");
        siPhone.setText("Phone: " +
            records[nextRecord][3] + "\n");
        nextRecord++;
      }
    }
    else if (c == cmExit)
    {
      notifyDestroyed();
    }
  }

  private String[][] splitFile()
  {
    InputStream is =
      getClass().getResourceAsStream("records.txt");
    try
    {
      StringBuffer sb = new StringBuffer();
      int chr = 0;
      while ((chr = is.read()) != -1)
      {
        sb.append((char) chr);
      }
      is.close();
      String[] data = split(sb.toString(),"\r\n");
      String[][] records = new String[data.length][4];
      for(int recordIndex = 0;
        recordIndex < data.length;
        recordIndex++)
      {
        for(int fieldIndex = 0;
          fieldIndex < 4;
          fieldIndex++)
        {
          records[recordIndex] = split(data[recordIndex],";");
        }
        recordCount = recordIndex;
      }
      return records;
    }
    catch (IOException e)
    {
      System.err.print(e.toString());
    }
    return null;
  }

  static private String[] split(String original, String separator)
  {
    Vector nodes = new Vector();
    int index = original.indexOf(separator);
    while(index>=0)
    {
      nodes.addElement( original.substring(0, index) );
      original = original.substring(index+separator.length());
      index = original.indexOf(separator);
    }
    nodes.addElement( original );
    String[] result = new String[ nodes.size() ];
    if( nodes.size()>0 )
    {
      for(int loop=0; loop<nodes.size(); loop++)
        result[loop] = (String)nodes.elementAt(loop);
    }
    return result;
  }

  public void commandAction(Command c, Item arg1) {

    if(c == cmDial)
    {
      try {
        platformRequest("tel:<1-(555)555-5555>");
      } catch (ConnectionNotFoundException e) {
        e.printStackTrace();
      }
    }

  }
}