mainmidlet.java

< JavaME核心技术最佳实践>>的全部源代码

package com.j2medev.chapter7;

import java.io.IOException;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.Player;
import javax.microedition.media.control.ToneControl;

public class MainMIDlet extends MIDlet implements CommandListener {
    
    private Display display = null;
    private List menu = null;
    private PlayerUI canvas = null;
    private Command exitCommand = new Command("Exit",Command.EXIT,1);
    private Command playCommand = new Command("Play",Command.OK,2);
    public static final String[] items = {"play tones","play wav","play video"};
    
    public MainMIDlet(){
        
    }
    
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            menu = new List("player",List.IMPLICIT,items,null);
            menu.addCommand(exitCommand);
            menu.setSelectCommand(playCommand);
            menu.setCommandListener(this);
        }
        display.setCurrent(menu);
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
        if(canvas != null){
            canvas.stopPlayer();
            canvas = null;
        }
    }
    
    public List getMenu(){
        return menu;
    }
    
    public void setCurrent(Displayable displayable){
        if(display != null)
            display.setCurrent(displayable);
    }
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == exitCommand){
            destroyApp(false);
            notifyDestroyed();
        }else if(cmd == playCommand || cmd == List.SELECT_COMMAND){
            int i = menu.getSelectedIndex();
            if(i == 0){
             /*   try{
                    Manager.playTone(60, 200, 90);
                }catch(MediaException ex){
                    ex.printStackTrace();
                }
               */ 
                playToneSequence();
            }else{
                if(canvas == null){
                    canvas = new PlayerUI(this);
                }
                canvas.setType(i);
                canvas.startPlayer();
                display.setCurrent(canvas);
            }
        }
    }
    
    private void playToneSequence(){
        byte tempo = 30; 
        byte d = 8;      
        
        byte C4 = ToneControl.C4;;
        byte D4 = (byte)(C4 + 2); 
        byte E4 = (byte)(C4 + 4); 
        byte G4 = (byte)(C4 + 7); 
        byte rest = ToneControl.SILENCE; 
        
        byte[] mySequence = {
            ToneControl.VERSION, 1,  
            ToneControl.TEMPO, tempo,
            ToneControl.BLOCK_START, 0,   
            E4,d, D4,d, C4,d, E4,d,     
            E4,d, E4,d, E4,d, rest,d,
            ToneControl.BLOCK_END, 0,    
            ToneControl.PLAY_BLOCK, 0,   
            D4,d, D4,d, D4,d, rest,d,    
            E4,d, G4,d, G4,d, rest,d,
            ToneControl.PLAY_BLOCK, 0,    
            D4,d, D4,d, E4,d, D4,d, C4,d  
        };
        
        try{
            Player p = Manager.createPlayer(Manager.TONE_DEVICE_LOCATOR);
            p.realize();
            ToneControl c = (ToneControl)p.getControl("ToneControl");
            c.setSequence(mySequence);
            p.start();
        } catch (IOException ioe) {
        } catch (MediaException me) { }
        
    }
}