Ask user permission while doing some process in loop

[sandeepkumar03]

Hi All,

I wanted to ask user permission while doing a process in loop.

loop
  ask user permission. (needs UI)
end loop

I tried to use alert (type FOREVER) here but it doesnt stops in between for asking user permission. The Display is being overwritten by the last Alert display in loop.

How can we have modal prompt to user in a loop for each iteration?

Please provide some suggestions.

Thanks,
Sandeep

[grahamhughes]

You need to think in an event driven way. Use the commandAction event from the Alert to trigger the action. There are no modal dialogues in J2ME.

Graham.

[sandeepkumar03]

Hi Graham,

Thanks for your reply. As far as i understand, we don't have to set next display object till we take input from user. We need to create modal dialogs by having logic so that display object is not overwritten.

Regards,
Sandeep

[grahamhughes]

There is no dialogue that will block the code until there is input. Such a user interface component does not exist. Structuring your code as a loop of this kind will not work.

Display the first Alert. Use the commandAction() event of the Alert's CommandListener to perform the action (assuming the Command is "yes"). At the end of performing the action, display the next Alert (setCurrent()).

Something like:

private static final Command acceptCommand = new Command(...);
private static final Command rejectCommand = new Command(...);

private int limit;
private int counter;
private Alert confirmationAlert;

public void start() {
    counter = 0;
    limit = ...;
    confirmationAlert = new Alert(...);
    confirmationAlert.addCommand(acceptCommand);
    confirmationAlert.addCommand(rejectCommand);
    confirmationAlert.setCommandListener(this);
    display.setCurrent(confirmationAlert);
}

public void commandAction(Command c, Displayable d) {
    if (c == acceptCommand) {
        doConfirmedAction();
    }

    counter++;
    if (counter < limit) {
        display.setCurrent(confirmationAlert);
    } else {
        display.setCurrent(nextScreen);
    }
}

Graham.