Android: set view style programmatically

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Technically you can apply styles programmatically, with custom views anyway:

private MyRelativeLayout extends RelativeLayout {
  public MyRelativeLayout(Context context) {
     super(context, null, R.style.LightStyle);
  }
}

The one argument constructor is the one used when you instantiate views programmatically.

So chain this constructor to the super that takes a style parameter.

RelativeLayout someLayout = new MyRelativeLayout(new ContextThemeWrapper(this,R.style.RadioButton));

Or as @Dori pointed out simply:

RelativeLayout someLayout = new RelativeLayout(new ContextThemeWrapper(activity,R.style.LightStyle));

Now in Kotlin:

class MyRelativeLayout @JvmOverloads constructor(
    context: Context, 
    attributeSet: AttributeSet? = null, 
    defStyleAttr: Int = R.style.LightStyle,
) : RelativeLayout(context, attributeSet, defStyleAttr)

or

 val rl = RelativeLayout(ContextThemeWrapper(activity, R.style.LightStyle))

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