Java (or J2ME) question

nobodythere

For a J2ME project I have this problem:

I have a class that is basically a File Browser for the phone. The class is instantiated in the main java file i.e.

public void startApp() {
        FileBrowser browser = new FileBrowser(Display.getDisplay(this), true);
........
}

The user selects a file and I want the main class to wait until this happens. How can I do it?

I know I can do it with a callback function but my code just starts to get overcomplicated, can I make the main class wait until an event has occured in the FileBrowser class?

marco_polo

grasshopa wrote: »

For a J2ME project I have this problem:

I have a class that is basically a File Browser for the phone. The class is instantiated in the main java file i.e.

public void startApp() {
        FileBrowser browser = new FileBrowser(Display.getDisplay(this), true);
........
}

The user selects a file and I want the main class to wait until this happens. How can I do it?

I know I can do it with a callback function but my code just starts to get overcomplicated, can I make the main class wait until an event has occured in the FileBrowser class?

Not sure how well it is supported in J2ME but I would use a seperate thread for the file browser if possible, you can then wait for an answer in the main thread. The browser thread should notify the main thread when a file is selected by the user.

nobodythere

Thanks, I'll try that. Only done threads in C so I'm eager to find another way! If anyone has a simpler way do chime in

Edit: Turns out it's very easy and I can use "wait()" and "notify()" - see http://www.crazysquirrel.com/computing/java/concurrency/wait-and-notify.jspx for anyone having trouble

Sam Vimes

i know in J2SE you can call a method called int returnVal = fc.showOpenDialog(.....)

and it opens the chooser box and the program waits until you choose a file. I'd assume it's something similar in J2ME