Can I use canvas and form together in a application

Can I use Canvas and form tog开发者_运维百科ether in application? If yes then how can I access form from Canvas?

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Yes you can use both but not at the same time. You can switch between them by using Display.setCurrent().

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You need your Midlet to find its display (and the form).You would to send a reference of your MIDlet to the canvas constructor.So your canvas would be look like this:

class myCanvas extends Canvas implements ... {
myMIDlet myHost; // the breadcrumb

    public myCanvas(... , myMIDlet host) {
    myHost = host; // remember our host MIDlet
    ...
    }

    ...
}   

Where "myMIDlet" is name of your MIDlet.
In your MIDlet:

public class myMIDlet extends MIDlet implements ... {
...
Form myForm = new Form( ... 
...
myCanvas ggg = new myCanvas(... , this) // <=== note the last parameter-the key to it all
...   
//switch display to myCanvas
display.setCurrent(ggg);
...
}

When you want to got to the form from "myCanvas" (probably in a commandAction or keyPressed methods of your canvas) do this:

Display disp = myHost.getDisplay();
disp.setCurrent(myHost.myForm);

Reference:
codeproject

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You can switch form to canvas. For example:

        canvasName c=new canvasName(this);
        Display.getDisplay(this).setCurrent(c);

But, in Canvas to Form, I don't know.