[移动开发]Android 开发多行TextView背景色分开问题

我们在开发文字背景色时候，往往ui设计稿是背景色只是文字区域，但是系统自带的BackgroundColorSpan 无法达到这样效果，所以我们需要自定义背景色。

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?贴上自定义BackgroundColorSpan代码：

public class BetterHighlightSpan extends ReplacementSpan {

    private int backgroundColor;
    //行间距
    private int lineSpacingExtra = 0;
    //上下两行文字背景的间距
    private int topSpacingExtra = 10;


    public BetterHighlightSpan(int backgroundColor) {
        this(backgroundColor, 0);
    }

    public BetterHighlightSpan(int backgroundColor, int lineSpacingExtra) {
        this(backgroundColor, lineSpacingExtra, 10);
    }

    public BetterHighlightSpan(int backgroundColor, int lineSpacingExtra, int topSpacingExtra) {
        super();
        this.backgroundColor = backgroundColor;
        this.lineSpacingExtra = lineSpacingExtra;
        this.topSpacingExtra = topSpacingExtra;

    }


    @Override
    public int getSize(Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
        return Math.round(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) {

        // save current color
        int oldColor = paint.getColor();
        //set background color
        RectF rect = new RectF(x, top + topSpacingExtra, x + paint.measureText(text, start, end), bottom - lineSpacingExtra);
        paint.setColor(backgroundColor);
        canvas.drawRect(rect, paint);

        // revert color and draw text
        paint.setColor(oldColor);
        canvas.drawText(text, start, end, x, y, paint);
    }
}

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