我想在开始时显示一个指示正在加载应用程序的进度条。
怎么可能呢?我已经创建了一个仪表,但我认为它不能以 LWUIT 形式实现..
根据我的评论,您可以使用进度条。您也可以使用滑块组件代替在 LWUIT 中显示进度条。
最好的方法是使用画布。您可以在所有应用程序中重用该类,它非常有效。创建一个类,比如一个名为 Splash 的类:
public class Splash extends Canvas {
private final int height;
private final int width;
private int current = 0;
private final int factor;
private final Timer timer = new Timer();
Image AppLogo;
MayApp MIDlet;
/**
*
* @param mainMIDlet
*/
public Splash(MyApp mainMIDlet) {
this.MIDlet = mainMIDlet;
setFullScreenMode(true);
height = getHeight();
width = this.getWidth();
factor = width / 110;
repaint();
timer.schedule(new draw(), 1000, 01);
}
/**
*
* @param g
*/
protected void paint(Graphics g) {
try {//if you want to show your app logo on the splash screen
AppLogo = javax.microedition.lcdui.Image.createImage("/appLogo.png");
} catch (IOException io) {
}
g.drawImage(AppLogo, getWidth() / 2, getHeight() / 2, javax.microedition.lcdui.Graphics.VCENTER | javax.microedition.lcdui.Graphics.HCENTER);
g.setColor(255, 255, 255);
g.setColor(128, 128, 0);//the color for the loading bar
g.fillRect(30, (height / 2) + 100, current, 6);//the thickness of the loading bar, make it thicker by changing 6 to a higher number and vice versa
}
private class draw extends TimerTask {
public void run() {
current = current + factor;
if (current > width - 60) {
timer.cancel();
try {
//go back to your midlet or do something
} catch (IOException ex) {
}
} else {
repaint();
}
Runtime.getRuntime().gc();//cleanup after yourself
}
}
}
在你的 MIDlet 中:
public class MyApp extends MIDlet {
Splash splashScreen = new Splash(this);
public MyApp(){
}
public void startApp(){
try{
Display.init(this);
javax.microedition.lcdui.Display.getDisplay(this).setCurrent(splashScreen);
//and some more stuff
} catch (IOException ex){}
}
//continue