alerttest.java

微型JAVA人编写的J2ME教材! 中带的原代码!简单易懂

//AlertTest.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class AlertTest extends MIDlet implements CommandListener
{
	private Display display;
	Command commit ;
	public AlertTest()
	{
		display = Display.getDisplay(this);
	}
	public void startApp()
	{
		List l = new List("List",Choice.IMPLICIT) ;
		l.append("Alarm",null) ;
		l.append("Confirmation",null) ;
		l.append("Error",null) ;
		l.append("Info",null) ;
		l.append("WARNING",null) ;
		l.setCommandListener(this) ;
		display.setCurrent(l) ;
	}
	public void pauseApp()
	{ }
	public void destroyApp(boolean unconditional)
	{ }
	public void commandAction(Command c,Displayable s)
	{
		if(c == List.SELECT_COMMAND)
		{
			Alert al = new Alert("Alert Test") ;
			List tmp = (List) s ;
			switch(tmp.getSelectedIndex())
			{
				case 0 :
					al.setType(AlertType.ALARM) ;
					al.setString("Alarm") ;
					al.setTimeout(Alert.FOREVER) ;
					display.setCurrent(al) ;
					break ;
				case 1 :
					al.setType(AlertType.CONFIRMATION) ;
					al.setString("Confirmation") ;
					display.setCurrent(al) ;
					break ;
				case 2 :
					al.setType(AlertType.ERROR) ;
					al.setString("Error") ;
					display.setCurrent(al) ;
					break ;
				case 3 :
					al.setType(AlertType.INFO) ;
					al.setString("Info") ;
					display.setCurrent(al) ;
					break ;
				case 4 :
					al.setType(AlertType.WARNING) ;
					al.setString("Warning") ;
					display.setCurrent(al) ;
					break ;
			}
		}
	}
}