Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Průvodce řešením problémů stáhnout pdf (Strana 54)

BlackBerry Java Development Environment Development Guide

Play media

Listen for media player events

Task Steps

Prepare the media player. 1. Invoke Player.realize().

2. Invoke Player.prefetch().

Start the media player. >Invoke Player.start(). The Player returns to the Prefetched state when you invoke

Player.stop() or when it reaches the end of the media file.

try {

Player p = Manager.createPlayer("http://www.test.rim.net/abc.wav");

p.start();

} catch (MediaException pe) {

} catch (IOException ioe) {

}

Determine the controls that a

media player supports.

1. Invoke Player.getControls().

2. To provide additional functionality for a media player, use one or more of the controls that the media

player supports.

You can use the same object to access multiple controls: for example, one object can be both a

VolumeControl and a ToneControl. The

javax.microedition.media package contains a number of

Control interfaces. See the

API Reference in the BlackBerry® Java Development Environment for more

information about the

javax.microedition.media package.

Adjust the volume of the

media player.

1. Invoke VolumeControl().

2. Define a volume value in the following range:

• 0: no volume

• 100: maximum volume level

The PlayerListener sends a VOLUME_CHANGED event when its state changes.

Close the media player. >Invoke Player.stop().

Task Steps

Listen for changes to the

media player state.

1. Implement PlayerListener.

2. To register the player listener, invoke addPlayerListener.

private void doPlay()

throws IOException, MediaException

{Player p = Manager.createPlayer("http://www.rim.com/rim.mp3");

p.addPlayerListener(this);

p.realize();

p.prefetch();

p.start();

}

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