Three parametrized constructor of custom view is not calling?

I want to make a custom view by extending View class. then I defined all three constructor.(below my custom view code)

public class CustomButton extends Button
{
public CustomButton(Context context)
{
    super(context);
}

public CustomButton(Context context, AttributeSet attrs)
{
    super(context, attrs);
}

public CustomButton(Context context, AttributeSet attrs, int defStyleAttr)
{
    super(context, attrs, R.attr.testStyle);
}

}

Xml Code : <com.example.viewlifecycledemo.CustomButton style="@style/test" android:layout_width="100dp" android:layout_height="100dp" />

Only ViewLifeCycleClass(Context context, AttributeSet attrs) is called, but I applied style, so ViewLifeCycleClass(Context context, AttributeSet attrs, int defStyleAttr) this method should be get call.

can anybody tell me, why two parametrized called?

This link is not working for me : Android Custom View Constructor