熟练使用J2ME在实际开发中的可选包MMAPI

王朝java/jsp·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

本文的目的是为读者提供处理不同情况的代码,您可以参考MMAPI DOC。

播放单音

try

{

Manager.playTone(ToneControl.C4, 5000

/* millisec */, 100 /* max vol */);

} catch (MediaException e)

{

}

简单媒体重放功能实现:

try

{

Player p = Manager.createPlayer

("http://webserver/music.mp3");

p.setLoopCount(5);

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

具体重放控制:

static final long SECS_TO_MICROSECS

= 1000000L;

Player p;

VolumeControl vc;

try {

p = Manager.createPlayer

("http://webserver/music.mp3");

p.realize();

// Set a listener.

p.addPlayerListener(new Listener());

// Grab volume control for the player.

// Set Volume to max.

vc = (VolumeControl)p.getControl

("VolumeControl");

if (vc != null)

vc.setLevel(100);

// Set a start time.

p.setMediaTime(5 * SECS_TO_MICROSECS);

// Guarantee that the player

can start with the smallest latency.

p.prefetch();

// Non-blocking start

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

class Listener implements PlayerListener

{

public void playerUpdate(Player p,

String event, Object eventData)

{

if (event == END_OF_MEDIA

event == STOP_AT_TIME)

{

System.out.println

("Done processing");

try {

p.setMediaTime

(5 * SECS_TO_MICROSECS);

p.start();

} catch (MediaException me)

{

}

break;

}

}

}

实现MIDI重放控制:

Player p;

TempoControl tc;

try {

p = Manager.createPlayer

("http://webserver/tune.mid");

p.realize();

// Grab the tempo control.

tc = (TempoControl)p.getControl

("TempoControl");

tc.setTempo(120000);

// 120 beats/min

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

视频重放功能实现:

Player p;

VideoControl vc;

try {

p = Manager.createPlayer

("http://webserver/movie.mpg");

p.realize();

// Grab the video control

and set it to the current display.

vc = (VideoControl)p.getControl

("VideoControl");

if (vc != null)

{

Form form = new Form("video");

form.append

((Item)vc.initDisplayMode

(vc.USE_GUI_PRIMITIVE, null));

Display.getDisplay(midlet)

.setCurrent(form);

}

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

播放RMS内存储的数据:

RecordStore rs;

int recordID;

:// code to set up the record store.

try {

InputStream is = new

ByteArrayInputStream

(rs.getRecord(recordID));

Player p = Manager.createPlayer

(is, "audio/X-wav");

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

播放Jar文件中存储的媒体

/** Notice that in MIDP 2.0,

the wav format is mandatory only */

/** in the case that the

device supports sampled audio.*/

try {

InputStream is =

getClass().getResourceAsStream

("audio.wav");

Player p = Manager.createPlayer

(is, "audio/X-wav");

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

不同Player的同步

Player p1, p2;

try {

p1 = Manager.createPlayer

("http://webserver/tune.mid");

p1.realize();

p2 = Manager.createPlayer

("http://webserver/movie.mpg");

p2.realize();

p2.setTimeBase(p1.getTimeBase());

p1.prefetch();

p2.prefetch();

p1.start();

p2.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

产生单音序列

byte tempo = 30;

// set tempo to 120 bpm

byte d = 8;

// eighth-note

byte C4 = ToneControl.C4;

byte D4 = (byte)(C4 + 2);

// a whole step

byte E4 = (byte)(C4 + 4);

// a major third

byte G4 = (byte)(C4 + 7);

// a fifth

byte rest = ToneControl.SILENCE;

// rest

byte[] mySequence = {

ToneControl.VERSION, 1,

// version 1

ToneControl.TEMPO, tempo,

// set tempo

ToneControl.BLOCK_START, 0,

// start define "A" section

E4,d, D4,d, C4,d, E4,d,

// content of "A" section

E4,d, E4,d, E4,d, rest,d,

ToneControl.BLOCK_END, 0,

// end define "A" section

ToneControl.PLAY_BLOCK, 0,

// play "A" section

D4,d, D4,d, D4,d, rest,d,

// play "B" section

E4,d, G4,d, G4,d, rest,d,

ToneControl.PLAY_BLOCK, 0,

// repeat "A" section

D4,d, D4,d, E4,d, D4,d, C4,d

// play "C" section

};

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)

{

}

语音捕捉和录音功能的实现

try

{

// Create a DataSource that

captures live audio.

Player p = Manager.createPlayer

("capture://audio");

p.realize();

// Get the RecordControl,

set the record location, and

// start the Player and

record for 5 seconds.

RecordControl rc =

(RecordControl)p.getControl

("RecordControl");

rc.setRecordLocation

("file:/tmp/audio.wav");

rc.startRecord();

p.start();

Thread.currentThread()

.sleep(5000);

p.stop();

rc.stopRecord();

rc.commit();

} catch (IOException ioe)

{

} catch (MediaException me)

{

} catch (InterruptedException e)

{

}

实现摄像功能

Player p;

VideoControl vc;

// initialize camera

try {

p = Manager.createPlayer

("capture://video");

p.realize();

// Grab the video control

and set it to the current

display.

vc = (VideoControl)p.getControl

("VideoControl");

if (vc != null)

{

Form form =

new Form("video");

form.append((Item)vc.initDisplayMode

(vc.USE_GUI_PRIMITIVE, null));

Display.getDisplay(midlet).setCurrent(form);

}

p.start();

} catch (IOException ioe)

{

} catch (MediaException me)

{

}

// now take a picture

try {

byte[] pngImage =

vc.getSnapshot(null);

// do something with the image ...

} catch (MediaException me)

{

}

 
 
 
免责声明:本文为网络用户发布,其观点仅代表作者个人观点,与本站无关,本站仅提供信息存储服务。文中陈述内容未经本站证实,其真实性、完整性、及时性本站不作任何保证或承诺,请读者仅作参考,并请自行核实相关内容。
 
 
© 2005- 王朝網路 版權所有 導航