Motorola C370 ユーザーズマニュアル
8
Gaming API and Sound
Gaming API and Sound
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public void playBackgroundMusic
(BackgroundMusic bgm,
boolean loop)
- Plays the specified BackgroundMusic object from the beginning.
This method first stops the current BackgroundMusic if any. Thus, this method may
be used to start background music (by specifying a non-null BackgroundMusic
be used to start background music (by specifying a non-null BackgroundMusic
object), restart the current background music (by specifying the same
BackgroundMusic object), change the background music, or end the background
music (by specifying null). The
BackgroundMusic object), change the background music, or end the background
music (by specifying null). The
loop
parameter is set to true if the BackgroundMusic
is to repeat indefinitely. Otherwise, set to false.
Using GameScreen
The GameDemoScreen class uses the
GameScreen
class to provide a UI screen for a
hypothetic game. GameDemoScreen is a subclass of
GameScreen
that implements
runnable for running the main game loop thread.
The following code sample shows implementation of using GameScreen.
The following code sample shows implementation of using GameScreen.
GameScreen
class GameDemoScreen extends GameScreen implements Runnable{
// ...
public void run() {
// Get the Graphics object for the
// off-screen buffer
Graphics g = getGraphics();
while (true) {
// Check user input and update
// positions if necessary
int keyState = getKeyStates();
if ((keyState & LEFT_KEY) != 0) {
sprite.move(-1, 0);
}
else if ((keyState & RIGHT_KEY) != 0) {
sprite.move(1, 0);
}
// Draw the background
g.drawImage(backgroundImage,0,0, Graphics.TOP
+
Graphics.LEFT);
// Draw the sprite on top of the background
sprite.draw(g);
// Flush the off-screen buffer
flushGraphics();
}
}
// ...
}