www.pudn.com > MusicCanvas.rar > VolumeControlDemo.java

 
/* 
 * 音量调整例子 
 */ 
 
import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 
 
public class VolumeControlDemo extends MIDlet implements CommandListener { 
	private Display display;  
 
	private Command exitCommand; 
 
	private Command playCommand; 
 
	private Command stopCommand;  
 
	private MusicCanvas musicCanvas;  
 
	public VolumeControlDemo() { 
		display = Display.getDisplay(this); 
		exitCommand = new Command("Exit", Command.EXIT, 1); 
		playCommand = new Command("Play", Command.SCREEN, 2); 
		stopCommand = new Command("Stop", Command.SCREEN, 2); 
		 
		if ((musicCanvas = new MusicCanvas()) != null) { 
			musicCanvas.addCommand(exitCommand); 
			musicCanvas.addCommand(playCommand); 
			musicCanvas.addCommand(stopCommand); 
			musicCanvas.setCommandListener(this); 
		} 
	} 
 
	public void startApp() { 
		if (musicCanvas != null) { 
			display.setCurrent(musicCanvas); 
			musicCanvas.start(); 
		} 
	} 
 
	public void pauseApp() { 
	} 
 
	public void destroyApp(boolean unconditional) { 
		musicCanvas.stop(); 
	} 
 
	public void commandAction(Command c, Displayable s) { 
		if (c == exitCommand) 
		{ 
			musicCanvas.stop(); 
 
			destroyApp(true); 
			notifyDestroyed(); 
		} else if (c == playCommand) //播放Wav文件 
		{ 
			musicCanvas.playsong(); 
		} else if (c == stopCommand) //停止播放 
		{ 
			musicCanvas.stop(); 
		} 
	} 
}