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While we will not explicitly build a list in our tutorial application, the device application manager will build one for us to allow our customers to choose which application to run. Once we have deployed our MIDlets to the device, the device will show us a choice to run either the ObtainQuote or RetrieveQuote applications (see figure 5.3 earlier in the chapter). TextBox A TextBox object provides a means for the user to enter and edit text. Along with the text field item (see page 80), the amount of text that can be entered and the type of text entered by a user (for example only numeric text or text in the format of a telephone number) can be set and constrained by the application. The device determines the number of text rows and columns displayed for a text box at any one time. Furthermore, the device must also provide a means to scroll when the amount of text to be displayed is larger than the number of characters that can be displayed at any one time. In chapter 4, The HiSmallWorld MIDlet utilized TextBox for its Screen object.
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textbox = new TextBox("", "Hi Small World!", 20, 0);
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In the example, the text box was given an empty string title (the first parameter) and initial contents of Hi Small World! . The third parameter specified the maximum number of characters that can be contained in the text box. The final parameter THE MIDP USER INTERFACE API 83
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allows for input constraints on TextBox objects. An application can use constraints to restrict user inputs in a text box or text field (see TextField item under Items above). For example, a constraint can be set up to allow only numbers to be entered. In our example, no constraints on the text box were set. In other words, this text box allows for any characters to be entered by the user. Other text box constraints could include allowing only an email address, an integer value, a phone number, or a URL. Additionally, a constraint is available to hide the true characters typed by showing a mask character such as * instead of the actual character. This is important when entering specific data or passwords. Alert
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Alert is a kind of message Screen that shows text and images to the user. It is used to inform users of errors or exceptional conditions. An alert s single image is set with a call to setImage(Image img) (see the Images section in 5.4.3), while an alert s text is set with a call to setString(String str). Like a Form, changes made to an alert while it is displayed take effect immediately without the need for refresh action on the part of the application. Again, as a Displayable object, changes to the Alert object should only be made while it is not visible to avoid potential performance or user confusion issues. By default, an alert is displayed for a period of time that is determined by the device, or can be set in milliseconds by the application. In fact, the application can set the display time to be indefinite with a call to the setTimeout(Alert.FOREVER) method. In this case, the alert becomes a modal Displayable object meaning that the user must dismiss it before something else is displayed. The system must provide a feature that allows the user to dismiss the alert. An Alert instance may also become modal if the application provides too much text and/or images to be displayed forcing the display to provide automatic scrolling. An instance of the AlertType class is usually associated with the alert to indicate the nature of the alert and provide more information to the user of the device. This is done by calling an alert s setType(AlertType type) method with the appropriate AlertType. When the device has the capability of playing sound, the AlertType object can be used to provide audible information. The predefined types of alerts are listed in table 5.2.
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Table 5.2 Alert Types, listed in this table, help provide visual and sometime audible context to alerts presented to the user. Alert Type ALARM CONFIRMATION ERROR INFO WARNING Description Alerts the user about some event based on a prearranged condition. Prompts the user to confirm a user action. Indicates an erroneous operation has occurred. Provides non-threatening information to the user. Warns the user of potentially harmful or dangerous operations.
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