CODEWITHSUNDEEP
javaandroidcanvasandroid-custom-viewandroid-resources
Vyacheslav
Vyacheslav

Reputation: 27211

onDraw doesn't work properly

I overrided RelativeLayout class by a new one:

public class myRelative extends RelativeLayout{
//...
//this function is called but layout is not filled
@Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        canvas.drawColor(Color.WHITE);
    }
//...
}

the XML file looks like this:

 <myRelative
                    android:id="@+id/someid"
                    android:clipChildren="false"
                    android:clipToPadding="false"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical" >
....
</....>

The behaviour of this Layout is the same as usual RelativeLayout? Why nothing changed? Any ideas?

Upvotes: 1

Views: 148

Answers (2)

Zielony
Zielony

Reputation: 16537

Layouts have special optimization. If there's no background set, onDraw is not called, because layout is supposed to be an empty view. Only dispatchDraw is called every time.

Upvotes: 1

GIGAMOLE
GIGAMOLE

Reputation: 1266

Try to set setWillNotDraw(false); in all constructors of your custom view. Or maybe your custom view placed in xml where parent view have also WHITE background.

Upvotes: 2

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