Como usar video streaming em Java ME

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Artigo

Criado por dcrocha em Dcrocha

Última alteração feita por hamishwillee em 09 Dec 2011

Aqui vai um exemplo de código para assistir streaming de video em Java ME

dcrocha 13:41, 31 October 2007 (EET)

package example;
 
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Ticker;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.PlayerListener;
import javax.microedition.media.control.VideoControl;
 
public class VideoCanvas extends Canvas implements PlayerListener, CommandListener {
 
	private ExampleStreamingMIDlet midlet = null;
	private Command start = new Command("Start",Command.OK,0);
	private Command stop = new Command("Stop",Command.OK,0);
	private Command back = new Command("Back",Command.OK,0);
	private Command exit = new Command("Exit",Command.BACK,0);
	private String url = "rtsp://rtsp.youtube.com/youtube/videos/HtVbAazUekM/video.3gp";
	private String status = "Press left softkey";
	private String status2 = "";
	private Player player = null;
	private VideoControl control = null;
 
	/**
	 * Constructor
	 * 
	 * @param midlet
	 */
 
	public VideoCanvas(ExampleStreamingMIDlet midlet, String url) {
		this.midlet = midlet;
		this.url = null;
		addCommand(start);
		addCommand(stop);
		addCommand(back);
		addCommand(exit);
		setCommandListener(this);
		this.setFullScreenMode(true);
	}
 
	public void commandAction(Command c, Displayable arg1) {
		if(c == start) {
			start();
		}
		else if(c == stop) {
			stop();
		}
		else if(c == exit) {
			midlet.notifyDestroyed();
		}
		else if(c == back) {
			Display.getDisplay(midlet).setCurrent(midlet.list);
		}
 
	}
 
	/**
	 * Paint
	 */
 
	protected void paint(Graphics g) {
		g.setColor(255,255,255);
		g.fillRect(0,0,getWidth(),getHeight());
		g.setColor(0,0,0);
		g.drawString(status2,0,0,Graphics.LEFT|Graphics.TOP);
		g.drawString(status,getWidth(),getHeight(),Graphics.RIGHT|Graphics.BOTTOM);
	}
 
	/**
	 * Start
	 *
	 */
 
	public void start() {
		try {
		    player = Manager.createPlayer(url);
		    player.addPlayerListener(this);
		    player.realize();
 
		    //uncomment for video problem with prefetch();
		    //player.prefetch();
 
		    // Grab the video control and set it to the current display.
		    control = (VideoControl)player.getControl("VideoControl");
		    if (control != null) {
		    	control.initDisplayMode(VideoControl.USE_DIRECT_VIDEO,this);
		    	control.setDisplaySize(176,144);
		    	int width = control.getSourceWidth();
		    	int height = control.getSourceHeight();
		    	status2 = "Before: SW=" + width + "-SH=" + height + "-DW=" + control.getDisplayWidth() + "-DH=" + control.getDisplayHeight();
		    }
 
		    player.start();
		}
		catch(Exception e) {
			Alert erro = new Alert("Erro",e.getMessage(),null,AlertType.ERROR);
			Display.getDisplay(midlet).setCurrent(erro);
		}
	}
 
	public void stop() {
		if(player != null) {
			player.deallocate();
			player.close();
		}
	}
 
	public void playerUpdate(Player p, String s, Object o) {
		status = s;
 
		if(p.getState() == Player.STARTED) {		
			int width = control.getDisplayWidth();
                        int height = control.getDisplayHeight();    	
			control.setDisplayLocation((getWidth() - width)/2,(getHeight() - height)/2);
			control.setVisible(true);
			status = s + ": DW=" + width + "-DH=" + height + "-SW=" + control.getSourceWidth() + "-SH=" + control.getSourceHeight();
		}
		repaint();
		setTitle(status);
	}
 
 
 
}