playmedia6.java

基于J2me的手机软件演示例子

package com.wy.ch12;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import java.io.*;

public class PlayMedia6 extends MIDlet
        implements PlayerListener,CommandListener,ItemStateListener{
    private Display display;
    private Form f;
    private Command command1;
    private Command command2;
    private Command command3;
    private Player p;
    private Gauge gauge;
    private VolumeControl  vc;
    public PlayMedia6(){
        display = Display.getDisplay(this);
        f = new Form("音乐播放测试");
        command1 = new Command("播放", Command.ITEM, 1);
        command2 = new Command("停止", Command.ITEM, 2);
        command3 = new Command("重放", Command.ITEM, 3);
        f.addCommand(command1);
        f.setCommandListener(this);
        gauge=new Gauge("音量控制", true, 10, 5);
        f.append(gauge);
        gauge.setLayout(Item.LAYOUT_CENTER);
        f.setItemStateListener(this);
        try {
            InputStream is = getClass().getResourceAsStream("/test-wav.wav");
            p = Manager.createPlayer(is, "audio/X-wav");
            p.realize();
            vc=(VolumeControl)p.getControl("VolumeControl");
            vc.setLevel(50);
            p.addPlayerListener(this);
        } catch (Exception e){
        }
    }
    
    public void startApp() {
        display.setCurrent(f);
    }
    
    public void commandAction(Command command, Displayable displayable) {
        if(command==command1){//播放
            f.removeCommand(command1);
            f.addCommand(command2);
            f.addCommand(command3);
            if(p!=null){
                try{
                    p.start();
                }catch (Exception e){
                }
            }//if
        }//if
        
        if(command==command2){//停止
            f.removeCommand(command2);
            f.addCommand(command1);
            f.addCommand(command3);
            if(p!=null){
                try{
                    p.stop();
                }catch (Exception e){
                }
            }//if
        }//if
        
        if(command==command3){//重放
            f.removeCommand(command3);
            f.addCommand(command2);
            if((p!=null)&&(p.getState()==Player.PREFETCHED)){
                try{
                    p.setMediaTime(-1);
                    p.start();
                }catch (Exception e){
                }
            }//if
        }//if
        
    }
    
    public void itemStateChanged(Item item){
        int volume=gauge.getValue()*10;
        if(vc!=null){
            vc.setLevel(volume);
        }
    }
    
    public void playerUpdate(Player player,String event,Object eventData){
        if(event==PlayerListener.CLOSED){
            System.out.println("播放器被关闭");
        }
        
        if(event==PlayerListener.DEVICE_AVAILABLE){
            System.out.println("设备可用");
        }
        
        if(event==PlayerListener.DEVICE_UNAVAILABLE){
            System.out.println("设备不可用");
        }
        
        if(event==PlayerListener.DURATION_UPDATED){
            System.out.println("播放器更新");
        }
        
        if(event==PlayerListener.END_OF_MEDIA){
            System.out.println("歌曲播放完毕");
        }
        
        if(event==PlayerListener.STARTED){
            System.out.println("歌曲播放开始");
        }
        
        if(event==PlayerListener.STOPPED){
            System.out.println("歌曲播放停止");
            f.removeCommand(command2);
            f.addCommand(command1);
            f.addCommand(command3);
        }
        
        if(event==PlayerListener.VOLUME_CHANGED){
            System.out.println("播放音量被改变");
        }
        
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
        if(p!=null){
            p.close();
        }
    }
}