Sun Microsystems J2ME User Manual download pdf (Page 100)

88 J2ME Wireless Toolkit User’s Guide • October 2004

A.6.1 Simple Tones

The Simple Tones example demonstrates how to use interactive synthetic tones.

The first menu entries play tones with different pitch and duration using

Manager.playTone(). Choosing the third menu item will play a chord on the

interactive MIDI device (locator "device://midi"). The shortMidiEvent()

method of MIDIControl is used to trigger the notes of the chord.

A.6.2 Simple Player

The Simple Player application demonstrates the range of audio and video

capabilities of the emulator. It includes example files in a variety of formats and

can play files from the emulator's persistent storage or from HTTP URLs.

The player portion uses a generic javax.microedition.media.Player

interface. The player displays duration, media time, and controls for running the

media file. If metadata is available in a file, the player enables you to view the

information, such as author and title. In the case of MIDI files, if karaoke text is

present in the file, it displays on the screen during play. Graphical user interface

controls can be viewed on the display screen if applicable. You can access these

controls by selecting one of the media samples in Simple Player, then pressing the

Menu button to view and select the desired command.

The demo includes the following media samples:

■ Bong plays a short WAV file. You can adjust certain playback features, as

described later in this document. The display shows the duration of the sound in

minutes:seconds:tenths of a second, for example 00:17:5. This audio sample is a

resource file in the MIDlet suite JAR file.

■ MIDI Scale plays an example musical scale. The display shows the title of the

selected music file, the duration of the song, the elapsed time during playback,

and the current tempo in beats per minute (bpm). This MIDI file is stored in the

MIDlet suite JAR file.

■ Simple Ring Tone plays a short sequence of Beethoven's Fifth Symphony.

The display shows the title of the selected music file, the duration of the song,

the elapsed time in seconds and tenths of a second during playback, and the

current tempo in beats per minute (bpm). This ringtone file (.jts format) is

stored in the MIDlet suite JAR file.

■ WAV Music plays a brief audio file. The display shows the title of the audio file,

the duration of the audio the elapsed time during playback, and the playback

rate in percent. This WAV file is retrieved from an HTTP server.

■ MIDI Scale plays a MIDI file that is retrieved from an HTTP server.

■ The Animated GIF example shows an animated GIF that counts from 1 to 5.

The file is stored in the MIDlet suite JAR.

■ Audio Capture from a default device lets you capture audio from the

microphone or connected device. The sound is captured and played back on the

speaker. To avoid feedback, use a headset.

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Sun Microsystems J2ME User Manual Page 100