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Java Source Code / Java Documentation » IDE Netbeans » mobility » example.photoalbum

Source Cross Reference Class Diagram Java Document (Java Doc)

example.photoalbum .PhotoAlbum

PhotoAlbum
public class PhotoAlbum extends MIDlet implements CommandListener,ItemStateListener,Runnable(Code)
	The PhotoAlbum MIDlet provides the commands and screens that implement a simple photograph and animation album. The images and animations to be displayed are configured in the descriptor file with attributes. Options are provided to to vary the speed of display and the frame style.

Constructor Summary
public	PhotoAlbum() Construct a new PhotoAlbum MIDlet and initialize the base options and main PhotoFrame to be used when the MIDlet is started.

Method Summary
void	closeOptions() Close the options store.
public void	commandAction(Command c, Displayable s) Respond to commands.
protected void	destroyApp(boolean unconditional) Destroy must cleanup everything not handled by the garbage collector.
public void	itemStateChanged(Item item) Listener for changes to options.
void	openOptions() Open the store that holds the saved options.
protected void	pauseApp() Pause is used to release the memory used by Image.
void	restoreOptions() Restore the options from persistent storage.
public void	run() The Run method is used to load the images. A form is used to report the progress of loading images and when the loading is complete they are displayed. Any errors that occur are reported using an Alert. Images previously loaded into the PhotoFrame are discarded before loading. Load images from resource files using `Image.createImage`. Images may be in resource files or accessed using http: The first image is loaded to determine whether it is a single image or a sequence of images and to make sure it exists. If the name given is the complete name of the image then it is a singleton. Otherwise it is assumed to be a sequence of images with the name as a prefix.
void	saveOptions() Save the options to persistent storage.
protected void	startApp() Start up the Hello MIDlet by setting the PhotoFrame and loading the initial images.

Constructor Detail

PhotoAlbum
public PhotoAlbum()(Code)
	Construct a new PhotoAlbum MIDlet and initialize the base options and main PhotoFrame to be used when the MIDlet is started.

Method Detail

closeOptions
void closeOptions()(Code)
	Close the options store.

commandAction
public void commandAction(Command c, Displayable s)(Code)
	Respond to commands. Commands are added to each screen as they are created. Each screen uses the PhotoAlbum MIDlet as the CommandListener. All commands are handled here: Select on Image List - display the progress form and start the thread to read in the images. Options - display the options form. Ok on the Options form - returns to the PhotoFrame. Back - display the Image List, deactivating the PhotoFrame. Cancel - display the image List and stop the thread loading images. Exit - images are released and notification is given that the MIDlet has exited. Parameters: c - the command that triggered this callback Parameters: s - the screen that contained the command

destroyApp
protected void destroyApp(boolean unconditional)(Code)
	Destroy must cleanup everything not handled by the garbage collector. In this case there is nothing to cleanup. Save the options for the next restart. Parameters: unconditional - true if this MIDlet should always cleanup

itemStateChanged
public void itemStateChanged(Item item)(Code)
	Listener for changes to options. The new values are set in the PhotoFrame. Parameters: item - - the item whose value has changed.

openOptions
void openOptions()(Code)
	Open the store that holds the saved options. If an error occurs, put up an Alert.

pauseApp
protected void pauseApp()(Code)
	Pause is used to release the memory used by Image. When restarted the images will be re-created. Save the options for the next restart.

restoreOptions
void restoreOptions()(Code)
	Restore the options from persistent storage. The options are read from record 1 and set in the frame and if the optionsForm has been created in the respective ChoiceGroups.

run

public void run()(Code)

The Run method is used to load the images. A form is used to report the progress of loading images and when the loading is complete they are displayed. Any errors that occur are reported using an Alert. Images previously loaded into the PhotoFrame are discarded before loading.

Load images from resource files using Image.createImage. Images may be in resource files or accessed using http: The first image is loaded to determine whether it is a single image or a sequence of images and to make sure it exists. If the name given is the complete name of the image then it is a singleton. Otherwise it is assumed to be a sequence of images with the name as a prefix. Sequence numbers (n) are 0, 1, 2, 3, .... The full resource name is the concatenation of name + n + ".png".

If an OutOfMemoryError occurs the sequence of images is truncated and an alert is used to inform the user. The images loaded are displayed.
See Also: createImage

saveOptions
void saveOptions()(Code)
	Save the options to persistent storage. The options are retrieved ChoiceGroups and stored in Record 1 of the store which is reserved for it. The two options are stored in bytes 0 and 1 of the record.

startApp
protected void startApp()(Code)
	Start up the Hello MIDlet by setting the PhotoFrame and loading the initial images.

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