videocanvas.java

看看如何用j2me 制作自己的媒体播放器。 附带直接运行文件

            System.err.println(e);
            close();
        }
    }

    public void start() {
        if (player == null)
            return;
        try {
            duration = player.getDuration();
            player.start();
            if (duration != Player.TIME_UNKNOWN) {
                sliderThread = new Thread(this);
                sliderThread.start();
            }
        } catch (Exception e) {
            System.err.println(e); 
            close();
        }
    }

    public void close() {
        synchronized (this) {
            pause();
            if (player != null) {
                player.close();
                player = null;
            }
        }
        VideoTest.getInstance().nullPlayer();
    }

    public void pause() {
        if ( player != null) {
            try {
                player.stop();
            } catch (MediaException me) {
        		System.err.println(me);
            }
        }
    }

    public void playerUpdate(Player plyr, String evt, Object evtData) {
        //try {
            if ( evt == END_OF_MEDIA ) {
                try {
                    player.setMediaTime(0);
                    player.start();
                } catch (MediaException me) {
                    System.err.println(me);
                }
            }
        //} catch (Exception e) {
        //    System.out.println("DEBUG: GOT EXCEPTION in VideoCanvas.playerUpdate("+evt.toString()+")!");
        //    e.printStackTrace();
        //}
    }
    
    private void doSnapshot() {
        new SnapshotThread().start();
    }
        
    class SnapshotThread extends Thread {
        final Canvas tThis = (Canvas)VideoCanvas.this;
        
        public void run() {
            try {
                byte [] snap = vidc.getSnapshot("encoding=png");
                if (snap != null) {
                Image im = Image.createImage(snap, 0, snap.length);
                Alert al = new Alert("Snapshot",
                             "Here's the snap",
                             im,
                             AlertType.INFO);
                al.setTimeout(2000);
                parentDisplay.setCurrent(al, tThis);
                }
            } catch (MediaException me) {
                System.err.println(me);
            //} catch (Exception e) {
            //    System.out.println("DEBUG: GOT EXCEPTION in VideoCanvas.SnapshotThread.run()!");
            //    e.printStackTrace();
            }
        }
    }

    public synchronized void stopVideoCanvas() {
        // stop & deallocate
        player.deallocate();
    }

    /* Handle the different keys pressed on the phone GUI emulator */
    public void keyPressed(int keyCode) {
        int cr, cv;
        switch (keyCode) {
        case Canvas.KEY_NUM4:
            cr = rc.getRate();
            cr -= 10000;
            cr = rc.setRate(cr);
            break;
        case Canvas.KEY_NUM6:
            cr = rc.getRate();
            cr += 10000;
            cr = rc.setRate(cr);
            break;
        case Canvas.KEY_STAR:
            if (vc != null) {
                cv = vc.getLevel();
                cv -= 10;
                cv = vc.setLevel(cv);
            }
            break;
        case Canvas.KEY_NUM0:
            if (vc != null) {
                vc.setMute(!vc.isMuted());
            }
            break;
        case Canvas.KEY_POUND:
            if (vc != null) {
                cv = vc.getLevel();
                cv += 10;
                cv = vc.setLevel(cv);
            }
            break;
        case Canvas.KEY_NUM7:
            if (fpc != null) {
                fpc.skip(-1);
            }
            break;
        case Canvas.KEY_NUM5:
            try {
                player.stop();
                if (!isCapturePlayer) {
                    player.setMediaTime(0);
                }
                player.deallocate();
            } catch (MediaException me) {
        		System.err.println(me);
            }
            break;
        case Canvas.KEY_NUM9:
            if (fpc != null) {
                fpc.skip(1);
            }
            break;
        case Canvas.KEY_NUM2:
            try {
                if (player.getState() == Player.STARTED)
                    player.stop();
                else
                    player.start();
            } catch (Exception e) {
                System.err.println(e);
            }
            break;
        case Canvas.KEY_NUM8:
            try {
                // Full screen
                if (vidc != null)
                    vidc.setDisplayFullScreen(fsmode = !fsmode);

                repaint();
            } catch (MediaException me) {
                System.err.println(me);
            }
            break;
        case Canvas.KEY_NUM1:
        case Canvas.KEY_NUM3:
            if (!isCapturePlayer) {
                long mTime = player.getMediaTime();
                long duration = player.getDuration();
                if (duration == Player.TIME_UNKNOWN || mTime == Player.TIME_UNKNOWN)
                    return;
                try {
                    if (keyCode == Canvas.KEY_NUM3) {
                        // Jump forward 10%
                        mTime += duration / 10;
                        if (mTime > duration)
                            mTime = duration;
                        player.setMediaTime(mTime);
                    } else if (keyCode == Canvas.KEY_NUM1) {
                        mTime -= duration / 10;
                        if (mTime < 0)
                            mTime = 0;
                        player.setMediaTime(mTime);
                    } else
                        return;
                } catch (MediaException me) {
                    System.err.println(me);
                }
            }
            break;
        /* Code to move the video around using cursor keys */
        default:
            int game = getGameAction(keyCode);
            int x = vidc.getDisplayX();
            int y = vidc.getDisplayY();
            if (game == UP)
                vidc.setDisplayLocation(x, y - 10);
            else if (game == DOWN)
                vidc.setDisplayLocation(x, y + 10);
            else if (game == LEFT)
                vidc.setDisplayLocation(x - 10, y);
            else if (game == RIGHT)
                vidc.setDisplayLocation(x + 10, y);
            else if (game == FIRE)
                vidc.setVisible(vis = !vis);
            repaint();
            break;
        }
    }


    /**
     * Deallocate the player and the display thread.
     * Some VM's may stop players and threads
     * on their own, but for consistent user
     * experience, it's a good idea to explicitely
     * stop and start resources such as player
     * and threads.
     */
    public synchronized void pauseApp() {
        suspended = true;
        if (player != null && player.getState() >= Player.STARTED) {
            // player was playing, so stop it and release resources.
            if (!isCapturePlayer) {
                restartMediaTime = player.getMediaTime();
            }
            player.deallocate();
            // make sure to restart upon resume
            restartOnResume = true;
        } else {
            restartOnResume = false;
        }
    }

	
    /**
     * If the player was playing when the MIDlet was paused,
     * then the player will be restarted here.
     */
    public synchronized void startApp() {
        suspended = false;
        if (player != null && restartOnResume) {
            try {
                player.prefetch();
                if (!isCapturePlayer) {
                    try {
                        player.setMediaTime(restartMediaTime);
                    } catch (MediaException me) {
                        System.err.println(me);
                    }
                }
                player.start();
            } catch (MediaException me) {
                System.err.println(me);
            }
        }
        restartOnResume = false;
    }
}