This class is used to show Stroked Characters

HollowSpan

public static class HollowSpan extends ReplacementSpan {
	private final Path mPath = new Path();
	private int mWidth;
	private int mStrokeWidth;
	private int mColorFill;
	private int mColorStroke;
	private PathEffect mPathEffect = null;

	public HollowSpan(int strokeWidth, int strokeColor) {
			mColorStroke = strokeColor;
			mStrokeWidth = strokeWidth;
	}

	public void setPathEffect(PathEffect effect) {
			mPathEffect = effect;
	}

	public int getSize(Paint paint, CharSequence text,
					int start, int end, Paint.FontMetricsInt fm) {

			mWidth = (int) (paint.measureText(text, start, end) +
							mStrokeWidth);
			return mWidth;
	}

	public void draw(
					Canvas canvas, CharSequence text, int start, int end,
					float x, int top, int y, int bottom, Paint paint) {

			paint.setPathEffect(mPathEffect);
			paint.setStrokeWidth(mStrokeWidth);

			mColorFill = paint.getColor();

			mPath.reset();
			paint.getTextPath(text.toString(), start, end, x, y, mPath);
			mPath.close();

			canvas.translate(paint.getStrokeWidth() / 2, 0);

			paint.setStyle(Paint.Style.STROKE);
			paint.setColor(mColorStroke);
			canvas.drawPath(mPath, paint);

			paint.setStyle(Paint.Style.FILL);
			paint.setColor(mColorFill);
			canvas.drawPath(mPath, paint);

			canvas.translate(-paint.getStrokeWidth() / 2, 0);
	}

	public static CharSequence addStroke(CharSequence charSequence) {
			final HollowSpan span = new HollowSpan(4, Color.BLACK);

			final SpannableString spannableString = new SpannableString(charSequence);
			spannableString.setSpan(span, 0, charSequence.length(), 0);
			return spannableString;
	}
}