StrokeOutlineSpan.java

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.text.style.ReplacementSpan;

public class StrokeOutlineSpan extends ReplacementSpan {
    private int fillColor = Color.WHITE;
    private int strokeOutlineColor = Color.BLACK;
    private float strokeWidth = 0;

    public void setFillColor(int fillColor) {
        this.fillColor = fillColor;
    }

    public void setStrokeOutlineColor(int strokeOutlineColor) {
        this.strokeOutlineColor = strokeOutlineColor;
    }

    public void setStrokeWidth(float strokeWidth) {
        this.strokeWidth = strokeWidth;
    }

    @Override
    public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
        return (int) paint.measureText(text, start, end);
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint) {
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(fillColor);
        canvas.drawText(text, start, end, x, y, paint);
        if (strokeWidth <= 0) return;
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(strokeOutlineColor);
        paint.setStrokeWidth(strokeWidth);
        canvas.drawText(text, start, end, x, y, paint);
    }
}