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Making a phone call using TextField in Java ME

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Line 35: Line 35:
  
 
<code java>
 
<code java>
 +
import javax.microedition.io.ConnectionNotFoundException;
 
import javax.microedition.lcdui.Command;
 
import javax.microedition.lcdui.Command;
 
import javax.microedition.lcdui.CommandListener;
 
import javax.microedition.lcdui.CommandListener;
Line 45: Line 46:
  
 
<code java>
 
<code java>
public class ExampleMIDlet extends MIDlet implements CommandListener {
+
public class MakingPhoneCall2 extends MIDlet implements CommandListener {
 +
    private TextField numberField;
 +
    private Command callCommand;
 
     private Command exitCommand;
 
     private Command exitCommand;
 
     private Form mainForm;
 
     private Form mainForm;
Line 52: Line 55:
 
     * Constructor. Constructs the object and initializes displayables.
 
     * Constructor. Constructs the object and initializes displayables.
 
     */
 
     */
     public ExampleMIDlet() {
+
     public MakingPhoneCall2() {
 
         mainForm = new Form("ExampleMIDlet");
 
         mainForm = new Form("ExampleMIDlet");
       
+
 
         // Create a phone number field, which allows a call to be made
 
         // Create a phone number field, which allows a call to be made
         mainForm.append(new TextField("Phone number", null, 20,
+
         numberField = new TextField("Phone number", null, 20, TextField.PHONENUMBER);
                TextField.PHONENUMBER));
+
        mainForm.append(numberField);
 +
 
 +
        callCommand = new Command("Call", Command.SCREEN, 0);
 +
        mainForm.addCommand(callCommand);
 
          
 
          
 
         exitCommand = new Command("Exit", Command.EXIT, 0);
 
         exitCommand = new Command("Exit", Command.EXIT, 0);
 
         mainForm.addCommand(exitCommand);
 
         mainForm.addCommand(exitCommand);
 +
 
         mainForm.setCommandListener(this);
 
         mainForm.setCommandListener(this);
 
     }
 
     }
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     */
 
     */
 
     public void commandAction(Command command, Displayable displayable) {
 
     public void commandAction(Command command, Displayable displayable) {
         if (command == exitCommand) {
+
         if (command == callCommand) {
 +
            call();
 +
        } else if (command == exitCommand) {
 
             // Exit the MIDlet
 
             // Exit the MIDlet
 
             destroyApp(true);
 
             destroyApp(true);
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         }
 
         }
 
     }
 
     }
 +
    /**
 +
    * Makes a call to number user typed in the text field.
 +
    */
 +
    private void call() {
 +
        String number;
 +
       
 +
        number = numberField.getString();
 +
        try {           
 +
            platformRequest("tel:" + number);
 +
        } catch (ConnectionNotFoundException ex) {
 +
            System.out.println(ex.getMessage());
 +
        }
 +
    }
 +
}
 
</code>
 
</code>
  

Revision as of 12:00, 27 June 2012

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Article Metadata

Contents

Overview

This snippet demonstrates how to make a phone call by using a TextField. The MIDlet constructs a phone number field and displays it on the screen. The user may enter a phone number into it or obtain one from the Contacts list. After that, he or she can select Options > Call to call that number.

Source

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.TextField;
import javax.microedition.midlet.MIDlet;
public class MakingPhoneCall2 extends MIDlet implements CommandListener {
private TextField numberField;
private Command callCommand;
private Command exitCommand;
private Form mainForm;
 
/**
* Constructor. Constructs the object and initializes displayables.
*/

public MakingPhoneCall2() {
mainForm = new Form("ExampleMIDlet");
 
// Create a phone number field, which allows a call to be made
numberField = new TextField("Phone number", null, 20, TextField.PHONENUMBER);
mainForm.append(numberField);
 
callCommand = new Command("Call", Command.SCREEN, 0);
mainForm.addCommand(callCommand);
 
exitCommand = new Command("Exit", Command.EXIT, 0);
mainForm.addCommand(exitCommand);
 
mainForm.setCommandListener(this);
}
 
/**
* Called when the MIDlet is started.
*/

public void startApp() {
Display.getDisplay(this).setCurrent(mainForm);
}
 
// Other inherited methods omitted for brevity
// ...
 
/**
* From CommandListener.
* Called by the system to indicate that a command has been invoked on a
* particular displayable.
* @param command the command that was invoked
* @param displayable the displayable where the command was invoked
*/

public void commandAction(Command command, Displayable displayable) {
if (command == callCommand) {
call();
} else if (command == exitCommand) {
// Exit the MIDlet
destroyApp(true);
notifyDestroyed();
}
}
/**
* Makes a call to number user typed in the text field.
*/

private void call() {
String number;
 
number = numberField.getString();
try {
platformRequest("tel:" + number);
} catch (ConnectionNotFoundException ex) {
System.out.println(ex.getMessage());
}
}
}

Postconditions

A phone number field is displayed on the screen. The user can enter a phone number and select Options > Call to call that number.

See also

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