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POHow to navigate in a circle
 

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  1. POHow to navigate in a circle
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    <p>the title might be not very descriptive but i couldn't think of a better one.</p> <p>The problem is as follows: I have one screen (ScreenOne) with a link to another screen (ScreenTwo). On the ScreenTwo is a link back to ScreenOne.</p> <p>I implemented this via custom RichTextFields and a custom ChangeListener.</p> <p>Now the problem is that i keep getting a StackOverflowError! Is there any way to navigate back and forth in that way?</p> <p>regards matt</p> <pre><code>public class MyApp extends UiApplication { public static void main(String[] args) { MyApp theApp = new MyApp(); theApp.enterEventDispatcher(); } public MyApp() { ScreenOne so = ScreenProvider.getInstance().getScreenOne(); so.initialize(); ScreenProvider.getInstance().getScreenTwo().initialize(); pushScreen(so); } } public class ScreenOne extends MainScreen { MyTextField link; public ScreenOne() { link = new MyTextField("FirstScreen"); add(link); } public void initialize(){ link.setChangeListener((FieldChangeListener) new MyFieldChangeListener(ScreenProvider.getInstance().getScreenTwo())); } } public class ScreenTwo extends MainScreen { MyTextField link; public ScreenTwo() { link = new MyTextField("SecondScreen"); add(link); } public void initialize(){ link.setChangeListener((FieldChangeListener) new MyFieldChangeListener(ScreenProvider.getInstance().getScreenOne())); } } public class MyFieldChangeListener implements FieldChangeListener { private Screen nextScreen; public MyFieldChangeListener(Screen nextScreen) { this.nextScreen = nextScreen; } public void fieldChanged(Field field, int context) { UiApplication.getUiApplication().pushScreen(nextScreen); } } public class MyTextField extends RichTextField { public MyTextField() { super(); } public MyTextField(String text) { super(text); } protected boolean touchEvent(TouchEvent message) { if (TouchEvent.CLICK == message.getEvent()) { FieldChangeListener listener = getChangeListener(); if (null != listener) listener.fieldChanged(this, 1); } return super.touchEvent(message); } } public class ScreenProvider { private static ScreenProvider instance = null; private ScreenProvider(){} public static ScreenProvider getInstance() { if (instance == null) { instance = new ScreenProvider(); } return instance; } private ScreenOne screenOne = new ScreenOne(); private ScreenTwo screenTwo = new ScreenTwo(); public ScreenOne getScreenOne() { return screenOne; } public ScreenTwo getScreenTwo() { return screenTwo; } } </code></pre>
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