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8
Gaming API and Sound
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public void playBackgroundMusic
boolean loop)
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
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
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.
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
// Draw the sprite on top of the background
sprite.draw(g);
// Flush the off-screen buffer
flushGraphics();
}
}
// ...
}
- Plays the specified BackgroundMusic object from the beginning.
parameter is set to true if the BackgroundMusic
loop
+ Graphics.LEFT);
(BackgroundMusic bgm,
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