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Thread: previous screen

  1. #1
    Registered User
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    Mar 2008
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    previous screen

    hi..
    how to display d previous screen in d midlet?just previous screen ?with out using d this command like
    display.setCurrent(name of last screen());

  2. #2
    Nokia Developer Champion
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    Re: previous screen

    There's not a standard way to do this. You could try mantaining an history of visited screen within a Vector, and when goind back you'll take the last inserted element (removing it from the Vector) and display as current screen.

    Pit

  3. #3
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    Re: previous screen

    hi...
    how to create such a vector of history of visited screen?

  4. #4
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    Re: previous screen

    Here's a simple class that can manage next/previous screens. You should use it to change screens within your j2me app.

    import java.util.Vector;

    import javax.microedition.lcdui.Display;
    import javax.microedition.lcdui.Displayable;
    import javax.microedition.midlet.MIDlet;

    public class ScreenManager
    {
    MIDlet midlet = null;
    Vector history = null;
    Displayable currentScreen = null;

    public ScreenManager(MIDlet midlet)
    {
    this.history = new Vector();
    this.midlet = midlet;
    }
    public void gotoScreen(Displayable nextScreen)
    {
    if(currentScreen != null)
    {
    history.addElement(currentScreen);
    }
    currentScreen = nextScreen;

    Display.getDisplay(midlet).setCurrent(nextScreen);
    }
    public void gotoPreviousScreen()
    {
    if(history.size() > 0)
    {
    currentScreen = (Displayable)history.lastElement();

    history.removeElement(currentScreen);

    Display.getDisplay(midlet).setCurrent(currentScreen);
    }
    }
    }
    Pit

  5. #5
    Registered User
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    Re: previous screen

    hi..
    how to use this code in midlet?

  6. #6
    Nokia Developer Champion
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    Re: previous screen

    You should instantiate an object of this class, and then use it everytime you need to go to another screen (so, you should not call directly Display.getDisplay(midlet).setCurrent() method).

    So, let's say u'r on screen A and want to go to screen B, you'll call:

    managerInstance.gotoScreen(bScreenInstance);

    Then, if you want to go back to previous screen, you'll call:

    managerInstance.gotoPreviousScreen();

    Anyway, this is only a basic example of how screen management can be implemented. You can freely implement yours once you've understood the base concept.

    Pit

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