Android – How to set width and height for custom view in programmatically

androidandroid-layoutclasscastexception

I have created a custom view named MyDraw ,this is my MyDraw code,

public class MyDraw extends View {


    public MyDraw(Context context) {
        super(context);

    }

    public MyDraw(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

    }

    public MyDraw(Context context, AttributeSet attrs) {
        super(context, attrs);

    }
         ........................................
}

I have added the view in XML file using package name. It is working fine. Now I want to set height and width for the MyDraw in run time,for that i have used following code,

mMyDraw.setLayoutParams(new LayoutParams(220, 300));

but i got Exception like,

java.lang.ClassCastException: android.view.ViewGroup$LayoutParams

How to solve this exception?
please help me..

Best Answer

You must override the onMeasure() method of the View.

For a nice example you can check here: http://kahdev.wordpress.com/2008/09/13/making-a-custom-android-button-using-a-custom-view/

And a very cool video that I would recommend is here: http://marakana.com/forums/android/general/563.html

Hope this helps!

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