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

 
import java.io.IOException; 
import java.io.InputStream; 
 
import javax.microedition.lcdui.*; 
import javax.microedition.media.*; 
import javax.microedition.media.control.*; 
 
public class MusicCanvas extends Canvas implements Runnable { 
 
	private boolean running = false; // 线程是否在运行 
 
	private Player player = null; // Player 
 
	static final int VOLUME_LEVEL = 50; // 音量初始化为50 
 
	private int volumesetting = VOLUME_LEVEL; // 音量级别 
 
	private boolean volumemuted = false; //是否暂停播放了	 
 
	protected void paint(Graphics g) {	 
 
	} 
 
	public void start() { 
		running = true; 
		Thread t = new Thread(this); 
		t.start(); 
	} 
 
	public void run() { 
		while (running) { 
			repaint(); 
			try { 
				Thread.sleep(100); 
			} catch (InterruptedException ie) { 
				System.out.println("Thread exception"); 
			} 
		} 
	} 
 
	public void stop() { 
		running = false; 
		if (player != null) { 
			player.close(); 
			player = null; 
		} 
	} 
 
	public void playsong() {		 
		 
		try { 
			//	创建player对象 
			if (player == null){ 
				InputStream in = getClass().getResourceAsStream("/test-wav.wav"); 
				//指定文件类型 
				 player = Manager.createPlayer(in, "audio/x-wav"); 
			} 
				 
			player.realize(); 
			//	设置循环播放次数 
			player.setLoopCount(1); 
			//	 设置音量为50 
			VolumeControl volume = (VolumeControl) player 
					.getControl("VolumeControl"); 
			volume.setLevel(VOLUME_LEVEL); 
			 
			player.start(); 
		} catch (IOException ioe) { 
			System.out.println("IO Exception!"); 
		} catch (MediaException me) { 
			System.out.println("Media Exception!"); 
		} 
	}  
 
	protected void keyPressed(int keycode) { 
		switch (getGameAction(keycode)) { 
		case LEFT: 
			adjustvolume(-5, false); 
			break; 
		case RIGHT: 
			adjustvolume(5, false); 
			break; 
		case FIRE: 
			adjustvolume(0, true); 
			break; 
		} 
	} 
 
	private void adjustvolume(int increment, boolean mute) { 
		if (player != null) { 
			VolumeControl volume = (VolumeControl) player 
					.getControl("VolumeControl"); 
			if (volume != null) { 
				//	目前音量级别 
				volumesetting = volume.getLevel(); 
				//	如果不是消音了，即停止播放了 
				if (mute != true) { 
					//	调整音量 
					volumesetting += increment;					 
					volumesetting = volume.setLevel(volumesetting); 
				} else {					 
					volume.setMute(!volume.isMuted()); 
					volumemuted = volume.isMuted(); 
				} 
			} 
		} 
	} 
 
}