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public TextField getSymbolField() { return symbolField; } public ChoiceGroup getInvestmentChoice() { return investmentChoice; }
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On construction of the form, the various items must also be created and added to the new Form object. Therefore, inside of the EntryForm class constructor, we create each of the items, set the appropriate reference variable to the item and add the item to the form.
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public EntryForm(String title) { super(title); symbolField = new TextField("Investment Symbol", "", 5, TextField.ANY); String choices[] = {"Stock", "Fund"}; investmentChoice = new ChoiceGroup("Type", Choice.EXCLUSIVE, choices, null); append(symbolField); append(investmentChoice); }
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Using the TextField constructor, TextField(String label, String text, int maxSize, int constraints), we create a TextField object to capture the investment symbol. The field has a label but no initial text contents. We have limited the maximum number of characters that the customer can enter to 5 (this should be sufficient for common stock and mutual fund exchanges), but we do not put any input constraints on the entry. Similarly, we create a new ChoiceGroup object to allow the customer to specify the type investment to be researched. It can be either a stock or mutual fund. There are two ChoiceGroup constructors from which to choose. We use the ChoiceGroup(String label, int choiceType, String[] stringElements, Image[] imageElements) constructor. The ChoiceGroup is given a label and choice strings. We do not assign any icons for the choices at this time. The choice type is set to EXCLUSIVE indicating that exactly one selection can be selected at any given time. Exactly one choice must be selected, but since we just created the choice group, no item has been physically selected. In other words, there is no default selection. In this case, the choice of which element is selected is left to the device. A condition where the choice group may not have a selected item could also occur if an element is added to an empty list or if the selected choice is deleted. Whenever the selected item cannot be determined, the system is left to select an element. In order to avoid having the system make an arbitrary selection on any choice, use setSelectedIndex(int elementNum, boolean selected). Finally, the text field and choice group items are appended to the instance of EntryForm and automatically display when their associated form is displayed. In its own EntryForm.java file, the code for the new Form class should appear similar to listing 5.8.
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import javax.microedition.lcdui.*; public class EntryForm extends Form { private TextField symbolField = null; private ChoiceGroup investmentChoice = null; public EntryForm(String title) { super(title); symbolField = new TextField("Investment Symbol", "", 5, TextField.ANY); TextField for entering a symbol String choices[] = {"Stock", "Fund"}; investmentChoice = new ChoiceGroup("Type", Choice.EXCLUSIVE, choices, null); append(symbolField); ChoiceGroup for append(investmentChoice); selecting Stock }
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The class defining the investment request form
or Fund type
public TextField getSymbolField() { return symbolField; } public ChoiceGroup getInvestmentChoice() { return investmentChoice; } }
To establish an instance of the newly created EntryForm class, we first add a variable and a method to the MIDlets. The variable keeps a reference to an instance of the form.
private EntryForm entryForm = null;
The method checks to see if an instance of the entry form has already been created. If not, a new instance of the form will be created and its reference will be stored in the variable. With the reference to the entry form (whether existing or newly created), the application makes the form visible by invoking the Display class s method setCurrent(Displayable nextDisplayable).
private void displayEntryForm () { if (entryForm == null) { entryForm = new EntryForm("ObtainQuote"); } displayMngr.setCurrent(entryForm); }
Finally, a line is added to the startApp() method of the ObtainQuoteMIDlet that calls our displayEntryForm() method.
protected void startApp() { displayMngr = Display.getDisplay(this); displayEntryForm(); }
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