nokiatoneplayer.java

来自「J2ME MIDP_Example_Applications」· Java 代码 · 共 73 行

// Copyright 2003 Nokia Corporation.
//
// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,
// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS
// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE
// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE
// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO
// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR
// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE
// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT
// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED
// BY THIRD PARTIES
//
// Furthermore, information provided in this source code is preliminary,
// and may be changed substantially prior to final release. Nokia Corporation
// retains the right to make changes to this source code at
// any time, without notice. This source code is provided for informational
// purposes only.
//
// Nokia and Nokia Connecting People are registered trademarks of Nokia
// Corporation.
// Java and all Java-based marks are trademarks or registered trademarks of
// Sun Microsystems, Inc.
// Other product and company names mentioned herein may be trademarks or
// trade names of their respective owners.
//
// A non-exclusive, non-transferable, worldwide, limited license is hereby
// granted to the Licensee to download, print, reproduce and modify the
// source code. The licensee has the right to market, sell, distribute and
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package example.tones;

import com.nokia.mid.sound.*;


// This is an extension of TonePlayer which implements its methods
// using Nokia's UI API.
class NokiaTonePlayer
    extends TonePlayer
{
    private final Sound sound;


    NokiaTonePlayer()
    {
        // We have to provide default values for Sound, though these will not
        // be used as we will call 'init' before using it. Make it silent
        // (frequency = 0) and duration 1ms.
        sound = new Sound(0, 1L);
    }


    // Start playing a tone at given frequency in Hz
    void play(int frequency)
    {
        // Tone will stop after two seconds (2000ms), but that's unlikely
        // to be a problem when people are trying to play music
        sound.init(frequency, 2000L);
        sound.play(1);
    }


    // Stop the currently playing tone (or do nothing, if no tone is playing)
    void stop()
    {
        sound.stop();
    }
}