Teams Winter 2011/team1/BlackBerry/Add Elements to Main Screen
3. Add Elements to Main (First) Screen
3.1. Open MyScreen.java
class.
3.2. Create class Student
with the following fields:
private String firstName; private String lastName; private String email;
3.3. Add an array in MyScreen
class to work with data.
3.4. The following elements are added to the MyScreen()
constructor. Add a text field:
add(new AutoTextEditField("Student Name: ", ""));
3.5. Add a search button:
ButtonField _bf=new ButtonField("Search"); add(_bf);
3.6. Add the array of students to the list field:
ObjectListField olf = new ObjectListField(); for (int i=0; i< ls.length; i++) { olf.insert(i, ls[i].getFirstName() + " " + ls[i].getLastName()); } add(olf);
3.7. Open MyApp
class and add menu items inside the constructor.
3.8 Add view, add, edit and delete student options to the menu and set commands to execute:
MyScreen _mainScreen = new MyScreen(); MenuItem view = new MenuItem(new StringProvider("View Student"), 100, 1); view.setCommand(new Command(new ViewCommandHandler())); _mainScreen.addMenuItem(view); MenuItem adds = new MenuItem(new StringProvider("Add Student"), 200, 2); adds.setCommand(new Command(new AddCommandHandler())); _mainScreen.addMenuItem(adds); MenuItem edit = new MenuItem(new StringProvider("Edit Student"), 300, 3); edit.setCommand(new Command(new EditCommandHandler())); _mainScreen.addMenuItem(edit); MenuItem delete = new MenuItem(new StringProvider("Delete Student"), 400, 4); delete.setCommand(new Command(new DeleteCommandHandler())); _mainScreen.addMenuItem(delete); pushScreen(_mainScreen);
3.8. Create inner classes to execute all commands:
class ViewCommandHandler extends CommandHandler { public void execute(ReadOnlyCommandMetadata metadata, Object context){ Dialog.alert("View was selected"); } } class AddCommandHandler extends CommandHandler { public void execute(ReadOnlyCommandMetadata metadata, Object context){ Dialog.alert("Add was selected"); } } class EditCommandHandler extends CommandHandler { public void execute(ReadOnlyCommandMetadata metadata, Object context){ Dialog.alert("Edit was selected"); } } class DeleteCommandHandler extends CommandHandler { public void execute(ReadOnlyCommandMetadata metadata, Object context){ Dialog.alert("Delete was selected"); } }
3.9. Now create the all other screen and implement menu commands.