vediocanvas.java

J2ME程序设计实例教程的源码

import javax.microedition.lcdui.*;

/**
 * 该类用于显示视频的播放
 */
public class VedioCanvas extends Canvas {
    private MobilPlayerMIDlet midlet;
    
    public VedioCanvas(MobilPlayerMIDlet midlet) {
        this.midlet = midlet;
        setCommandListener(midlet);
    }
    
    public void paint(Graphics g) {
        g.fillRect(0, 0, getWidth(), getHeight());
    }
    
    //通过方向键改变音量
    protected void keyReleased(int keyCode) {
        int action = getGameAction(keyCode);
        int indicate = 0;
        if(action == Canvas.UP || action == Canvas.RIGHT) {  //增大音量
            indicate = 1;
        }
        else if(action == Canvas.DOWN || action == Canvas.LEFT) { //减小音量
            indicate = -1;
        }
        
        midlet.changeVolume(indicate);
    }
}