千丝海阁

有时候你需要自己定义basiceditfield的长宽等属性，这里就需要layout，下面实例为你介绍如何自定义。

package newpackage;
import net.rim.device.api.system.Display;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.BasicEditField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.MainScreen;
/**
 *
 * @author Tiandi Zhang
 */
public class Demo extends UiApplication {
    public static void main(String[] args){
       Demo theApp = new Demo();
       theApp.enterEventDispatcher();
    }
        public Demo(){
           pushScreen(new mainscreen());
       }
}
class mainscreen extends MainScreen{
    public mainscreen() {
        super();
        LabelField title = new LabelField("TextField Demo",LabelField.ELLIPSIS|LabelField.USE_ALL_WIDTH);
        setTitle(title);
        BasicEditField t1 = new BasicEditField("Text",""){
        public int getPreferredWidth()
      {
         return Display.getWidth();
      }
      public int getPreferredHeight()
      {
         return 100;
      }
      public void layout(int width, int height)
      {
          super.layout(width, getPreferredHeight());
          setExtent(width, getPreferredHeight());
      }
 };
        ButtonField b1 = new ButtonField("save");
        add(t1);
        add(b1);
    }
}