isColor() Returns true if the current device has a color screen, returns false in Java

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isColor() Returns true if the current device has a color screen, returns false
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numColors() Returns the number of colors or grayscales that can be represented on
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getCurrent() Returns the current Displayable object The Displayable
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object returned might not actually be visible on the display if the MIDlet is running in the background, or if the Displayable object is currently obscured by a system screen The value returned by getCurrent() might also be null if the setCurrent() method has not been called yet setCurrent(Displayable nextDisplayable) This is a key method that actually changes the current display Simply pass in a new Displayable object The change will typically not take effect immediately, but may be delayed so that it occurs between event delivery method calls Because of this delay, a call to getCurrent() shortly after a call to setCurrent() is unlikely to return the value passed to setCurrent()
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When a MIDlet application is first started, there is no current Displayable object It is the responsibility of the application to ensure that a Displayable object is visible and can interact with the user at all times Therefore, an application should always call setCurrent() as part of its initialization
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setCurrent(Alert alert, Displayable nextDisplayable) This is a version of setCurrent() specially suited for alerts An alert is a special type of Displayable object that is intended to be shown and immediately dismissed For example, a typical alert might be a dialog box that warns the player about some imminent problem
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To use this method, set the alert as the current Displayable object and choose another screen as the nextDisplayable As soon as the alert box is dismissed, the next Displayable screen will be shown
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The javaxmicroeditionlcduiScreen class is the common superclass of all high-level user interface objects The Screen itself is pretty simple It simply allows you to add a title or scrolling ticker to the Displayable class Every screen that a user will see should be created as its own class The display will automatically refresh whenever the contents of a screen are updated For example, suppose a List object featuring a main game menu is currently being displayed If the application inserts a new element at the beginning of the List, it is displayed immediately and the other elements will be rearranged appropriately There is no need for the application to call another method to refresh the display WARNING It is good programming practice to only change the contents of a screen when it is not visible (that is, while another Displayable is current) Changing the contents of the screen while it is visible may result in performance problems on some devices, and might also be confusing if the screen's content changes at the same moment when a user is interacting with it The following classes are subclasses of the Screen class:
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All these classes inherit four methods from Screen:
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getTitle() Gets the title of the Screen setTitle(String title) Sets the title of the Screen If the Screen is
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physically visible, the visible effect should take place no later than immediately after the callback getTicker() Gets the scrolling ticker object used by the Screen setTicker(Ticker ticker) Sets a scrolling ticker to be used for this Screen, replacing any previous ticker Several Screen objects within an application can share the same ticker This is done by calling setTicker() on different screens with the same Ticker object
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The javaxmicroeditionlcduiForm class is the most commonly used child of Screen It might contain an arbitrary mixture of items, such as images, text fields, date fields, gauges, and choice groups In general, any subclass of the Item class can be contained within a Form Every mobile device will handle the layout, traversal, and scrolling of a form in a slightly different way The items contained in a Form are referred to by their indices, which are consecutive integers starting from zero These items can be edited using the append(), delete(), insert(), and set() methods More information about dealing with user interface items can be found in 13, "High-Level Approach" Listing 92, for example, creates a start-up form and sets it as the current Displayable Listing 92 Creating and Calling a Form
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import javaxmicroeditionMIDlet*; import javaxmicroeditionlcdui*; public class Game extends MIDlet { private Display display; public void startApp() { display = DisplaygetDisplay(this); StartForm form = new StartForm(this); displaysetCurrent(form); } public void pauseApp() {} public void destroyApp(boolean b) {} public Display getDisplay() { return display; } public void exit() { destroyApp(false); notifyDestroyed(); } }
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