Tell about methods that cause View to redraw in Android.

invalidate() and requestLayout().

invalidate():

• Requests a redraw of the current View.
• Calls the onDraw() method of the View.
• Does not lead to recalculating the size and position of the View and its child elements.
• Used when only the appearance of the View has changed (e.g., color, text).

requestLayout():

• Requests a full measurement and layout cycle for the View.
• Calls the onMeasure() and onLayout() methods of the View and its parent elements.
• Leads to recalculating the size and position of the View and its child elements.
• Used when the size, position of the View, or its child elements have changed.

Example of using invalidate():

// Changing the background color of the View
view.setBackgroundColor(Color.RED)
view.invalidate() // Request the View to redraw with the new color

Example of using requestLayout():

// Changing the width of the View
val params = view.layoutParams
params.width = 200
view.layoutParams = params
view.requestLayout() // Request the View to re-measure and re-layout