此自定義范圍可以幫助您了解基本想法：

class SupSubSpan extends ReplacementSpan {

private String sup;

private String sub;

public SupSubSpan(String sup, String sub) {

this.sup = sup;

this.sub = sub;

}

@Override

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

return (int) Math.max(paint.measureText(sup), paint.measureText(sub));

}

@Override

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

canvas.drawText(sup, x, y + paint.ascent() / 2, paint);

canvas.drawText(sub, x, y - paint.ascent() / 2, paint);

}

}

總結

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