cameramidlet.java

J2ME MIDP_Example_Applications

// Copyright 2002 Nokia Corporation. 
// 
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// retains the right to make changes to this source code at 
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// 
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// unnamed package

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


public class CameraMIDlet
    extends MIDlet
{
    private CameraCanvas cameraCanvas = null;
    private DisplayCanvas displayCanvas = null;


    public CameraMIDlet()
    {
    }

    
    public void startApp()
    {
        Displayable current = Display.getDisplay(this).getCurrent();
        if (current == null)
        {
            // first call
            cameraCanvas = new CameraCanvas(this);
            displayCanvas = new DisplayCanvas(this);
            Display.getDisplay(this).setCurrent(cameraCanvas);
            cameraCanvas.start();
        }
        else
        {
            // returning from pauseApp
            if (current == cameraCanvas)
            {
                cameraCanvas.start();
            }
            Display.getDisplay(this).setCurrent(current);
        }
    }


    public void pauseApp()
    {
        if (Display.getDisplay(this).getCurrent() == cameraCanvas)
        {
            cameraCanvas.stop();
        }
    }


    public void destroyApp(boolean unconditional)
    {
        if (Display.getDisplay(this).getCurrent() == cameraCanvas)
        {
            cameraCanvas.stop();
        }
    }


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


    void cameraCanvasExit()
    {
        exitRequested();
    }


    void cameraCanvasCaptured(byte[] pngData)
    {
        cameraCanvas.stop();
        displayCanvas.setImage(pngData);
        Display.getDisplay(this).setCurrent(displayCanvas);
    }


    void displayCanvasBack()
    {
        Display.getDisplay(this).setCurrent(cameraCanvas);
        cameraCanvas.start();
    }
}