×
Namespaces

Variants
Actions

Simple Java ME Canvas loading bar

From Nokia Developer Wiki
Jump to: navigation, search

This is an example of a simple canvas based loading bar which you can use as a splash screen for you application.

Article Metadata
Article
Created: muiruri (31 Aug 2009)
Last edited: hamishwillee (09 Aug 2013)

First we create the canvas for the application and get the width and height for the screen

height = getHeight();
width = getWidth();

We then have a factor for the incrementing the loading

factor = width / 4;

We also have a Timer Object

Timer timer = new Timer();

This code comes in the paint method of the canvas

g.setColor(0x00ffccff);
g.fillRect(0, 0, width, height);
g.setColor(0x00ffffff);
g.fillRect(25, height / 2, width - 50, 2);
g.setColor(0x003399ff);
g.drawString("Application name", 100, (height / 2) - 30, Graphics.TOP | Graphics.HCENTER);
g.fillRect(25, height / 2, current, 2);
g.drawString("Loading...", 100, (height / 2) + 20, Graphics.BOTTOM | Graphics.HCENTER);

We then create a class inside the canvas class which will extend the TimerTask class to handle the animation

     private class Draw extends TimerTask {
public void run() {
current = current + factor;
if (current > width - 50) {
current = 0;
repaint();
} else {
repaint();
}
}
}

In the constructor of the midlet, we schedule the timer Object to run

repaint();
timer.schedule(new Draw(), 2000, 2000);

We now need to create an object of the canvas in the midlet and display it.

This page was last modified on 9 August 2013, at 08:15.
113 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.

 

Thank you!

We appreciate your feedback.

×