Displaying Messages Using Alert in Nokia Apps

Displaying Alert Message in Nokia Apps

Here we coded a sample app for displaying alert messages in Nokia lcdui app.Alert messages are one which are used mostly in cases like Alarm,Confirmations,Error messages etc.

Creating Alert is very easy one in lcdui apps.The syntax is simple as given below

To create an Alert in LCUDI:

Alert alert=new Alert("I am a Alert");

You can even set the timeout property to set the timing for how long the alert should be displayed to the user.

To set timeout property for Alert:

Alert alert=new Alert("I am a Alert");
alert.setTimeout(5000);

You should enter the timeout in microseconds only.

Finally you have to add the Alert to current display otherwise it wont be displayed.

To add Alert to Display:

display.setCurrent(alert);

Sample code:

Here we create a complete sample code for Alert

In this code we implemented in such a way that when you click on command button you will get a Alert message in screen

import javax.microedition.lcdui.Alert;

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.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

public class Alert_Sample extends MIDlet implements CommandListener {

Display display;

Command ok;

public Alert_Sample() {

// TODO Auto-generated constructor stub

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

// TODO Auto-generated method stub

}

protected void pauseApp() {

// TODO Auto-generated method stub

}

protected void startApp() throws MIDletStateChangeException {

// TODO Auto-generated method stub

this.display=Display.getDisplay(this);

Form a=new Form("Alert Sample");

ok= new Command("Calculate", Command.SCREEN, 1);

a.addCommand(ok);

a.setCommandListener(this);

this.display.setCurrent(a);

}

public void commandAction(Command arg0, Displayable arg1) {

// TODO Auto-generated method stub

Alert alert=new Alert("I am a Alert");

alert.setTimeout(1000);

display.setCurrent(alert);

}

}

You will get output resemble the below picture

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