Implementing the NewScreen class

This screen is used to create a new message entry to the record store. It contains fields for the message and the password.

To create the class:

1. Assign the class to the package satsa and import the required classes.

   package satsa;
   
   import javax.microedition.lcdui.Command;
   import javax.microedition.lcdui.CommandListener;
   import javax.microedition.lcdui.Displayable;
   import javax.microedition.lcdui.Form;
   import javax.microedition.lcdui.TextField;

2. Create the class by extending Form and implementing CommandListener.

   // Displays a form to enter new messages
   class NewScreen
     extends Form
     implements CommandListener
   {
   
     private final SATSAMIDlet midlet;
     private final Command commandBack =
       new Command("Back", Command.BACK, 1);
     private final Command commandSave =
       new Command("Save", Command.ITEM, 1);
     TextField messageField;
     TextField passwordField;
   
     NewScreen(SATSAMIDlet midlet)
     {
       super(null);
       this.midlet = midlet;
     }
     
     public void commandAction(Command c, Displayable d)
     {
       if (c==commandBack)
       {
         midlet.showMessageList();
       }
       if (c==commandSave)
       {
         midlet.addNewMessage(messageField.getString(),
             passwordField.getString());
       }
     }
   
     void createForm()
     {
       deleteAll();
       setTitle("Add new message ");
       messageField = new TextField("Message",
           "",
           80,
           TextField.ANY);
       // Notice that the max length is 16 as indicated for the AES key
       passwordField = new TextField("Password",
           "",
           16,
           TextField.PASSWORD);
       append(messageField);
       append(passwordField);
       addCommand(commandBack);
       addCommand(commandSave);
       setCommandListener(this);
     }
   }