Android——SpannableString实现带圆角标签效果

本节是对以往章节的一个复习练习，用到的知识前面已经提到过，不知道的同学请参考前几篇文章。
Android——SpannableString字体大小不一致垂直居中

今天要实现的效果图如下：
在这里插入图片描述
RadiusBackgroundSpan

public class RadiusBackgroundSpan extends ReplacementSpan {    private int fontSize = -1;    private boolean isSp = true;    private int margin;    private int padding;    private int radius;    private int textColor;    private int bgColor;    public RadiusBackgroundSpan(int fontSize, int margin, int radius, int textColor, int bgColor) {        this.fontSize = fontSize;        this.margin = margin;        this.radius = radius;        this.textColor = textColor;        this.bgColor = bgColor;    }    @Override    public int getSize(@NonNull Paint paint, CharSequence text, int start, int end, @Nullable Paint.FontMetricsInt fm) {        Paint newPaint = getCustomTextPaint(paint);        return (int) newPaint.measureText(text, start, end) + margin * 2;    }    @Override    public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end, float x, int top, int y, int            bottom, @NonNull Paint paint) {        Paint newPaint = getCustomTextPaint(paint);        int textWidth = (int) newPaint.measureText(text, start, end);        RectF rect = new RectF();        rect.top = top + margin;        rect.bottom = bottom - margin;        rect.left = (int) (x + margin);        rect.right = rect.left + textWidth + margin;        paint.setColor(bgColor);        canvas.drawRoundRect(rect, radius, radius, paint);        newPaint.setColor(textColor);        Paint.FontMetrics fontMetrics = newPaint.getFontMetrics();        int offsetX = (int) ((rect.right - rect.left - textWidth) / 2) + margin;        int offsetY = (int) ((y + fontMetrics.ascent + y + fontMetrics.descent) / 2 - (top + bottom) / 2);        canvas.drawText(text, start, end, x + offsetX, y - offsetY, newPaint);    }    private TextPaint getCustomTextPaint(Paint srcPaint) {        TextPaint textPaint = new TextPaint(srcPaint);        if (fontSize != -1) {            textPaint.setTextSize(isSp ? fontSize * textPaint.density : fontSize);        }        return textPaint;    }}

MainActivity.java

private void radiusTagSpan() {        String format = "哪吒之魔童降世上映新推荐";        SpannableString ss = new SpannableString(format);        RadiusBackgroundSpan radiusBackgroundSpan = new RadiusBackgroundSpan(35, 10, 10, getResources().getColor(R                .color.white), getResources().getColor(R.color.red));        ss.setSpan(radiusBackgroundSpan, format.length() - 3, format.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);        tvImageSpan.setText(ss);    }

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