I have a problem wtih a program.
The program logic is like this..........
from a class which extends midlet class i create object of
a class(say canobj(word)) which extends canvas class by
passing a string.
the next statement is display.setCurrent(canobj);
Everything is fine but the paint(Graphics g) method is not
executed. What may the problem. please suggest me the
answer.
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Answer Posted / susanta mandal
With the same flow,the paint(Graphics g) will execute.
If not executes then do not display.setCurrent(canobj) here.
Go to the Canvas class & take a Display object & initialize
it with the MIDlet call display object.Then from the Canvas
class constructor call a method,where first call repaint()
method,then serviceRepaint() method,then call
display.setCurrent(this).It will work like bellow..
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class TestView extends MIDlet {
CanvasView canObj;
static Display DISPLAY;
public void startApp() {
String word = "Hi Susanta";
DISPLAY = Display.getDisplay(this);
canObj = new CanvasView(word,this);
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
}
class CanvasView extends Canvas implements CommandListener{
Display display;
String str="";
Command exit;
TestView midlet;
public CanvasView(String str,TestView midlet){
this.midlet = midlet;
display = TestView.DISPLAY;
this.str = str;
exit = new Command("Exit",Command.EXIT,0);
addCommand(exit);
setCommandListener(this);
callPaint();
}
protected void paint(Graphics g){
setFullScreenMode(true);
g.setColor(0,0,200);
g.fillRect(getWidth()/2-40,getHeight()/2-20,80,40);
g.setColor(255,255,255);
g.drawString(str,getWidth()/2,getHeight()/2-10,g.HCENTER|g.TOP);
}
public void callPaint(){
repaint();
serviceRepaints();
display.setCurrent(this);
}
public void commandAction(Command command,Displayable disp){
if(command == exit){
midlet.destroyApp(true);
}
}
}
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