mediasamplermidlet.java

J2ME MIDP_Example_Applications

// Copyright 2002 Nokia Corporation. 
// 
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// 
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// 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. 
// 
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// Corporation.
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// Sun Microsystems, Inc.
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// 
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// unnamed package

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;


public class MediaSamplerMIDlet
    extends MIDlet
{
    private final MediaList list;
    private final VideoCanvas videoCanvas;


    public MediaSamplerMIDlet()
    {
        list = new MediaList(this,
                             getAppProperty("AMR-Audio-Clip"),
                             getAppProperty("WAV-Audio-Clip"),
                             getAppProperty("MIDI-Audio-Clip"));
        videoCanvas = new VideoCanvas(this, getAppProperty("Video-Clip"));
    }

    
    public void startApp()
    {
        Displayable current = Display.getDisplay(this).getCurrent();
        if (current == null)
        {
            // first call
            Display.getDisplay(this).setCurrent(list);
        }
        else
        {
            Display.getDisplay(this).setCurrent(current);
        }
    }


    public void pauseApp()
    {
        list.stop();
        videoCanvas.stop();
    }


    public void destroyApp(boolean unconditional)
    {
        list.stop();
        videoCanvas.stop();
    }


    private void exitRequested()
    {
	    destroyApp(false);
	    notifyDestroyed();
    }


    Display getDisplay()
    {
        return Display.getDisplay(this);
    }


    void listExit()
    {
        exitRequested();
    }


    void listSelectVideo()
    {
        if (videoCanvas != null)
        {
            videoCanvas.prepareToPlay();
            Display.getDisplay(this).setCurrent(videoCanvas);
        }
    }


    void videoDone()
    {
        Display.getDisplay(this).setCurrent(list);
    }


    void videoExit()
    {
        exitRequested();
    }


    void alertError(String message)
    {
        Alert alert = new Alert("Error", message, null, AlertType.ERROR);
        Display display = Display.getDisplay(this);
        Displayable current = display.getCurrent();
        if (!(current instanceof Alert))
        {
            // This next call can't be done when current is an Alert
            display.setCurrent(alert, current);
        }
    }
}