Java Development

[jssantosh84]

hi all,

I want to clear all the editFields on pressing the escape key. I know that i have to implement a keyListener but what i don't know what to add to clear the editFields.

If anybody knows how to do this please share.

Thanks

[arkadyz]

Field curField = UiApplication.getUiApplication.getActiveScreen().getLeafFieldWithFocus();
if ((curField != null) && (curField instanceof EditField)) {
  ((EditField)curField).setText("");
  curField.invalidate();
}

[jssantosh84]

I want to clear all the editFields of the previous screen on pressing the escape key. i think this might clear only the fields with focus(of the current screen).

[arkadyz]

Just go through each field and if it is EditField setText to "".

getScreenBelow(), getFieldCount(), getField() and instanceof are your friends.

[jssantosh84]

since i m implementing this in a keylistener class, which will be adde to almost all screens, so this doesn't seem to work out

[arkadyz]

Then add UiApplication.getUiApplication().getActiveScreen() to the picture. I guess you want to pop that screen and "clean" the previous screen (which is about to show up) before doing so.

Something like that:

Screen activeScr = UiApplication.getUiApplication().getActiveScreen();
Screen nextScreen = null;
if (activeScr != null) {
  nextScreen = activeScr.getScreenBelow();
}
if (nextScreen != null) {
  int count = nextScreen.getFieldCount();
  for (int i = count - 1; i >= 0; --i) {
    Field curField = nextScreen.getField(i);
    if (curField instanceof TextField) {
      ((TextField) curField).setText("");
    }
  }
}

[jssantosh84 · Accepted solution]

i solved the problem. i am poping the below screen, creating a new instance of that particular screen and pushing it using invokeLater

public class KeyListenerImplementation implements KeyListener
{

     private Screen belowScreen;

    public boolean keyChar( char key, int status, int time )
    {

         if ( key == Characters.ESCAPE && UiApplication.getUiApplication().getScreenCount()>2)
        {
            belowScreen = UiApplication.getUiApplication().getActiveScreen().getScreenBelow();
            
            if(belowScreen instanceof  XXScreen){
                
                UiApplication.getUiApplication().invokeLater(new Runnable(){
                    public void run() {
                        UiApplication.getUiApplication().popScreen(belowScreen);

                        UiApplication.getUiApplication().pushScreen(new XXScreen));
                    }
                    });
            }

}}