在j2me中显示alert然后跳转到另一个表单
我正在开发 J2ME 应用程序。我想在表单中显示警报并显示另一个班级的另一个表单。我尝试过以下方法来显示警报。
public void showMsg()
{
Alert success = new Alert("Data Not found.");
//success.setImage(img2);
success.addCommand(new Command("Ok", Command.OK, 0));
success.addCommand(new Command("Cancel", Command.CANCEL, 0));
success.setCommandListener(this);
success.setTimeout(Alert.FOREVER);
Display.getDisplay(parent).setCurrent(success, chapterForm);
}
显示警报后，我跳转到另一个表单：
Display.getDisplay(parent).setCurrent(welcomeForm);
当我运行此表单时，它不显示警报，而是跳转到 welComeForm。那么，我怎样才能显示警报，然后跳转到另一种形式。
I am working on J2ME application. I want to show alert in Form and display another Form from another class. I have tried the following method to show alert.
public void showMsg()
{
Alert success = new Alert("Data Not found.");
//success.setImage(img2);
success.addCommand(new Command("Ok", Command.OK, 0));
success.addCommand(new Command("Cancel", Command.CANCEL, 0));
success.setCommandListener(this);
success.setTimeout(Alert.FOREVER);
Display.getDisplay(parent).setCurrent(success, chapterForm);
}
After showing the alert I am jumping to another form as:
Display.getDisplay(parent).setCurrent(welcomeForm);
When I run this it don't show the alert but jump to the welComeForm. So, how can I show alert and then jump to another form.
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警报不会自动前进到
chapterForm，因为您已将警报上的默认侦听器替换为this。使用 CommandListener 接口中的 commandAction() 事件从警报中获取“确定”或“取消”。然后你可以使用Display.setCurrent(Displayable d)来显示你想要显示的Form。The Alert won't advance automatically to
chapterFormbecause you have replaced the default listener on the Alert withthis. Use the commandAction() event in the CommandListener interface to get the OK or Cancel from the Alert. Then you can useDisplay.setCurrent(Displayable d)to show the Form you want to display.Display.getDisplay(parent).setCurrent(welcomeForm)很可能是它不显示警报而是跳转到 welcomeForm 的原因。准确地说，它（设备）可能会暂时显示警报，但是一旦您调用setCurrent(welcomeForm)，它就会立即被welcomeForm 覆盖。如果您希望通过警报命令显示
welcomeForm，只需从现在的位置删除代码
setCurrent(welcomeForm)将擦除的代码插入
this.commandAction方法（this是您在代码摘录中使用的命令侦听器）Display.getDisplay(parent).setCurrent(welcomeForm)is most likely the reason why it don't show the alert but jump to the welComeForm. To be precise it (device) may show alert for a moment, but as soon as you invoke thatsetCurrent(welcomeForm), it gets momentarily overwritten by welcomeForm.If you want
welcomeFormto be dissplayed by command from alert, justwipe out the code
setCurrent(welcomeForm)from where it is nowinsert that wiped-out code into
this.commandActionmethod (thisis command listener you use in your code exerpt)一个巧妙的解决方案是在将当前显示设置为警报后启动一个新线程，在这个新线程中您可以执行 Thread.sleep(2000);为了等待，然后显示新表单。
A nifty solution is to start a new thread after setting the current display to the Alert, and in this new thread you can do a Thread.sleep(2000); in order to wait, and after that you display the new form.