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The content is presented in a way that both the professional developer and his line of business manager or sponsoring executive can quickly grasp the key principles that they both have to understand to make good decisions and get on with the business at hand. David Via |
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Chapter 11 includes a sample BlackBerry Java application that illustrates how to use the different types of layout manager objects available to BlackBerry Java developers. Here's the code:
package com.bbdevfundamentals.ScreenLayout;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.component.SeparatorField;
import net.rim.device.api.ui.container.FlowFieldManager;
import net.rim.device.api.ui.container.HorizontalFieldManager;
import net.rim.device.api.ui.container.MainScreen;
//Create the HelloWorld class
public class ScreenLayout extends UiApplication {
public static void main(String[] args) {
// Instantiate the HelloWorld object
ScreenLayout sl = new ScreenLayout();
// Enter the Event Dispatcher
sl.enterEventDispatcher();
}
public ScreenLayout() {
pushScreen(new ScreenLayoutScreen());
}
}
final class ScreenLayoutScreen extends MainScreen {
public ScreenLayoutScreen() {
super();
// By default the BlackBerry screen uses a
// Vertical Flow Manager
LabelField lblTitle = new LabelField("Screen Layout Sample",
LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
setTitle(lblTitle);
add(new LabelField("Field 1"));
add(new LabelField("Field 2"));
add(new LabelField("Field 3"));
// Now lets switch to a Horizontal flow manager
HorizontalFieldManager hfm = new HorizontalFieldManager();
this.add(hfm);
hfm.add(new LabelField("Label Field 4"));
hfm.add(new LabelField("Label Field 5"));
hfm.add(new EditField("Edit Field", "1"));
hfm.add(new EditField("Edit Field", "2"));
// Now a flow field manager
FlowFieldManager flowManager = new FlowFieldManager();
this.add(flowManager);
ButtonField button1 = new ButtonField("Button 1");
ButtonField button2 = new ButtonField("Button 2");
ButtonField button3 = new ButtonField("Button 3");
ButtonField button4 = new ButtonField("Button 4");
flowManager.add(button1);
flowManager.add(button2);
flowManager.add(button3);
flowManager.add(button4);
// Back to using the default vertical flow manager
this.add(new SeparatorField());
this.add(new RichTextField("Let's add some more edit fields:"));
add(new EditField("Edit Field", "3"));
add(new EditField("Edit Field", "4"));
}
} |
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