Motorola C450 ユーザーズマニュアル
5
Application Management
Application Management
27
pauseApp()
AMS, MIDlet
The
pauseApp()
method is called from either AMS or
from within the MIDlet.
The
pauseApp()
should pause active threads, and
prepare for
startApp()
to be called.
If the application is to be resumed with a screen other than
the present, then the Displayable should be set current in
the
the
startApp()
or the
pauseApp().
destroyApp()
AMS
The
destroyApp()
method is called from AMS and
signals the MIDlet to clean up any resources to prepare for
termination. For example, open RMS records should be
termination. For example, open RMS records should be
closed, threads should be stopped, and any other
housekeeping chores should be performed.
The MIDlet should not call
housekeeping chores should be performed.
The MIDlet should not call
destroyApp().
notifyDestroy
ed()
ed()
MIDlet
The
notifyDestroyed()
method is called by the
MIDlet to exit and terminate itself.
All housekeeping such as stopping active threads and
All housekeeping such as stopping active threads and
closing RMS records should be performed before calling
notifyDestroyed().
notifyDestroyed()
notifies AMS to terminate the
calling MIDlet.
On a device without a windowing system, only one application can have focus at a time.
When an application has focus, it receives keypad input, and has access to the display,
speakers, LED lights, vibrator, etc. The C370, C450, and C550 device can only run one
speakers, LED lights, vibrator, etc. The C370, C450, and C550 device can only run one
MIDlet at a time, but that MIDlet has to share focus with the system user interface. That
user interface is a higher priority than the MIDlet, so the MIDlet will immediately lose focus
when the system needs to handle a phone call or some other interrupt.
The concept of focus correlates directly with the MIDlet state. i.e. when a MIDlet loses
focus because of a phone call, the MIDlet is immediately paused. Conversely to the
user interface is a higher priority than the MIDlet, so the MIDlet will immediately lose focus
when the system needs to handle a phone call or some other interrupt.
The concept of focus correlates directly with the MIDlet state. i.e. when a MIDlet loses
focus because of a phone call, the MIDlet is immediately paused. Conversely to the
example of starting the MIDlet, the MIDlet loses focus immediately, then its
pauseApp()
method is called.
The paused state is not clearly defined by MIDP. The only requirement placed on the
device manufacturer is that a paused MIDlet must be able to respond to network events
and timer events. On Motorola devices, the paused state simply implies that the MIDlet is
in the background as mentioned above, but it doesn’t force any of the threads to stop
execution. Essentially, a paused MIDlet is a MIDlet without focus whose
and timer events. On Motorola devices, the paused state simply implies that the MIDlet is
in the background as mentioned above, but it doesn’t force any of the threads to stop
execution. Essentially, a paused MIDlet is a MIDlet without focus whose
pauseApp()
method has been called. It’s up to the developer to control their threads, such as making
them sleep for longer periods, completely pausing game threads, or terminating threads
that can be restarted when the MIDlet is made active again.
that can be restarted when the MIDlet is made active again.
Similarly, a MIDlet’s focus is also lost immediately before its
destroyApp()
method
is called.
The MIDlet must be written properly (as described above) to implement all methods in the
javax.microedition.midlet package, especially
The MIDlet must be written properly (as described above) to implement all methods in the
javax.microedition.midlet package, especially
startApp
( ) and
pauseApp
( ). A