Get Help MIDlet Example

This example illustrates how to take help from any other text file which is stored in res folder in your midlet. In this example we are creating a form which name is "New Form". In this form we will add two buttons that are "Help" and "Exit". The "Exit" button is used to Exit from current window, but the "Help" button is used to call helpDATA() function. In this function we get the text from help.txt file and stored it in a buffer like below:

private String helpDATA(){

    InputStream is = getClass().getResourceAsStream("help.txt");

    StringBuffer sb = new StringBuffer();

    try{

      int chars, i = 0;

      while ((chars = is.read()) != -1){

        sb.append((char) chars);

      }

      return sb.toString();

    }catch (Exception e){         

      System.out.println("Can't create Buffers");

    }

    return null;

  }

The Application is as follows:

A Complete Source Code of GetHelp.java


import java.io.*;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;



public class GetHelp extends MIDlet implements CommandListener{

  private Display display;

  private Form form;

  private Command help, exit;

  private Alert alert;



  public void startApp(){

        display = Display.getDisplay(this);

    help = new Command("Help", Command.SCREEN, 1);

    exit = new Command("Exit", Command.EXIT, 1);    

    form = new Form("New Form");

    form.addCommand(exit);

    form.addCommand(help);

    form.setCommandListener(this);

    display.setCurrent(form);

  }



  public void pauseApp(){}



  public void destroyApp(boolean unconditional){

    notifyDestroyed();

  }



  public void commandAction(Command c, Displayable s){

    String label = c.getLabel();

    if (label.equals("Help")){

      String string = helpDATA();

      if (string != null){

        alert = new Alert("Help", string, null, null);

        alert.setTimeout(Alert.FOREVER);

        display.setCurrent(alert, form);

      }

    } else if (label.equals("Exit")){

      destroyApp(false);

    } 

  }



  private String helpDATA(){

    InputStream is = getClass().getResourceAsStream("help.txt");

    StringBuffer sb = new StringBuffer();

    try{

      int chars, i = 0;

      while ((chars = is.read()) != -1){

        sb.append((char) chars);

      }

      return sb.toString();

    }catch (Exception e){         

      System.out.println("Can't create Buffers");

    }

    return null;

  }

}

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