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val inflater: LayoutInflater = LayoutInflater.from(this)
val newView = inflater.inflate(R.layout.new_view, rootView, attachToRoot)

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class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val rootView: ViewGroup = findViewById(R.id.activity_main)

        val inflater = LayoutInflater.from(this)
        val red = inflater.inflate(R.layout.rectangle, rootView, true)

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val lime = inflater.inflate(R.layout.rectangle, rootView, false)
lime.setBackgroundColor(ContextCompat.getColor(this, R.color.lime))
rootView.addView(lime)

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rootView.removeViewInLayout(red)
rootView.removeViewInLayout(lime)

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CustomPaint(
  painter: DrawCircle(getRandomColor(), 80.0),
);

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class DrawCircle extends CustomPainter {
  Paint circlePaint;
  final radius;
  DrawCircle(Color color, this.radius) {
    this.circlePaint = Paint()
      ..color = color
      ..style = PaintingStyle.fill;
  }
  @override
  void paint(Canvas canvas, Size size) {

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GestureDetector(
  child: Circle(getRandomColor(), circleState),
  onTap: onCircleTap,
  )
);

void onCircleTap() {
    circleState.currentState.setColor(getRandomColor());
}

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CustomPaint(
    size: Size(CIRCLE_RADIUS * 2, CIRCLE_RADIUS * 2),
    painter: DrawCircle(color, CIRCLE_RADIUS),
);

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CustomPaint(
    size: Size(CIRCLE_RADIUS, CIRCLE_RADIUS),
    painter: DrawCircle(color, CIRCLE_RADIUS)
);

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ClipRect(
  child: CustomPaint(
    size: Size(CIRCLE_RADIUS, CIRCLE_RADIUS),
    painter: DrawCircle(color, CIRCLE_RADIUS)
  )
);