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使用索爱V800开发流媒体应用程序

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　　索尼爱立信的V800手机可以支持流媒体的播放，使用非常简单。如果你曾经使用MMAPI播放过声音或者做过照相应用的话，那么上手非常快。

　　你要做的就是根据指定的URL来创建一个Player，然后启动这个Player。URL的格式如下：rtsp://MyServer/myVideo.3gp。下面的代码例子演示了如何使用：

private void startStreaming(){
        try{
             myPlayer = Manager.createPlayer("rtsp://MyServer/MyFile.3gp");
             myPlayer.addPlayerListener(this);
             myPlayer.realize();
              // Grab the video control and set it to the current display.
              vc = (VideoControl)myPlayer.getControl("VideoControl");
              if (vc != null) {
                myForm.append((Item)vc.initDisplayMode(vc.USE_GUI_PRIMITIVE, null));
                // sets the display size of the video.
                vc.setDisplaySize(120,160);
              }
              myPlayer.start();

         }catch(Exception e){
                log("Exception: " + e.toString());
         }

    }

　　我们需要注意的是进行连接服务器的时候必须在单独线程中处理，而不能在主线程。因为这样会堵塞系统。接下来你要做的就是构建一个支持RTSP的流媒体服务器，放置一个3gp格式的文件在服务器上。下面的代码演示了如何使用V800开发流媒体应用。

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

/**
* A simple example of the MMAPI (JSR 135) support for Streaming Video
* with the Sony Ericsson V800.
*
* This code is part of the Tips & Tricks section at
* www.SonyEricsson.com/developer
*
* COPYRIGHT All rights reserved Sony Ericsson Mobile Communications AB 2005.
* The software is the copyrighted work of Sony Ericsson Mobile Communications AB.
* The use of the software is subject to the terms of the end-user license
* agreement which accompanies or is included with the software. The software is
* provided "as is" and Sony Ericsson specifically disclaim any warranty or
* condition whatsoever regarding merchantability or fitness for a specific
* purpose, title or non-infringement. No warranty of any kind is made in
* relation to the condition, suitability, availability, accuracy, reliability,
* merchantability and/or non-infringement of the software provided herein.
*
* Written by Jöns Weimarck, January 2005
*/
public class StreamingVideo extends MIDlet implements CommandListener, PlayerListener, Runnable{


    private Display myDisplay;
    private Form myForm;

    private Thread streamingThread;
    private Player myPlayer;
    private VideoControl vc;
    private boolean running=false;

    public StreamingVideo() {
        myDisplay = Display.getDisplay(this);
        myForm=new Form ("Streaming Test");
        myForm.addCommand(new Command("Exit", Command.EXIT,0));
        myForm.addCommand(new Command("Start", Command.OK,0));
        myForm.setCommandListener(this);
    }

    protected void startApp() throws MIDletStateChangeException {
        myDisplay.setCurrent(myForm);
        streamingThread = new Thread(this);
    }

protected void pauseApp() {}

    protected void destroyApp(boolean unconditional) {
        try {
            myPlayer.stop();
            myPlayer.close();
        }
        catch( Exception e ) {
            log("Exception: " + e.toString());
        }
    }

   /**
    * Inits and starts the Player for Video Streaming
    */
    private void startStreaming(){
        try{
             myPlayer = Manager.createPlayer("rtsp://MyServer/MyFile.3gp");
             myPlayer.addPlayerListener(this);
             myPlayer.realize();
              // Grab the video control and set it to the current display.
              vc = (VideoControl)myPlayer.getControl("VideoControl");
              if (vc != null) {
                myForm.append((Item)vc.initDisplayMode(vc.USE_GUI_PRIMITIVE, null));
                // sets the display size of the video.
                vc.setDisplaySize(120,160);
              }
              myPlayer.start();

         }catch(Exception e){
                log("Exception: " + e.toString());
         }

    }

    public void commandAction(Command c, Displayable s){
        if(c.getCommandType()==Command.EXIT){
            running=false;
            notifyDestroyed();
        }else{
            streamingThread.start();
        }
    }


     /**
      * PlayerListener Interface method, logs all player event.
      */
     public void playerUpdate(Player player, String event, Object eventData){
        log(" ** playerUpdate: " + event + " **");

     }

     public void log(String msg){
        System.out.println(msg);
     }

     public void run() {
         running=true;
         startStreaming();
         while(running){
             Thread.yield();
         }
     }
}

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