Custom Layout that rounds the corners of its content

Question

I would like to create a generic ViewGroup which can then be reused in XML layouts to round the corners of anything that is put into it.

For some reason canvas

Answer 1

You can override the draw(Canvas canvas) method:

    public class RoundedLinearLayout extends LinearLayout {
        Path mPath;
        float mCornerRadius;

        public RoundedLinearLayout(Context context) {
            super(context);
        }

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

        public RoundedLinearLayout(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
        }

        @Override
        public void draw(Canvas canvas) {
            canvas.save();
            canvas.clipPath(mPath);
            super.draw(canvas);
            canvas.restore();
        }

        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            RectF r = new RectF(0, 0, w, h);
            mPath = new Path();
            mPath.addRoundRect(r, mCornerRadius, mCornerRadius, Direction.CW);
            mPath.close();
        }

        public void setCornerRadius(int radius) {
            mCornerRadius = radius;
            invalidate();
        }
      }