RoundDrawable

public static class RoundedDrawable extends Drawable {

		protected final float cornerRadius;
		protected final int margin;

		protected final RectF mRect = new RectF(),
				mBitmapRect;
		protected final BitmapShader bitmapShader;
		protected final Paint paint;

		public RoundedDrawable(Bitmap bitmap, int cornerRadius, int margin) {
			this.cornerRadius = cornerRadius;
			this.margin = margin;

			bitmapShader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
			mBitmapRect = new RectF (margin, margin, bitmap.getWidth() - margin, bitmap.getHeight() - margin);

			paint = new Paint();
			paint.setAntiAlias(true);
			paint.setShader(bitmapShader);
		}

		@Override
		protected void onBoundsChange(Rect bounds) {
			super.onBoundsChange(bounds);
			mRect.set(margin, margin, bounds.width() - margin, bounds.height() - margin);

			// Resize the original bitmap to fit the new bound
			Matrix shaderMatrix = new Matrix();
			shaderMatrix.setRectToRect(mBitmapRect, mRect, Matrix.ScaleToFit.FILL);
			bitmapShader.setLocalMatrix(shaderMatrix);

		}

		@Override
		public void draw(Canvas canvas) {
			canvas.drawRoundRect(mRect, cornerRadius, cornerRadius, paint);
		}

		@Override
		public int getOpacity() {
			return PixelFormat.TRANSLUCENT;
		}

		@Override
		public void setAlpha(int alpha) {
			paint.setAlpha(alpha);
		}

		@Override
		public void setColorFilter(ColorFilter cf) {
			paint.setColorFilter(cf);
		}
	}