Android SpannableString在部分文字后面设置了背景

debugcn 发表于 Dev

罗斯福

我想创建类似此图片所示的内容：在此处输入图片说明

我设法用SpannableStringBuilder创建了Evertyhing，除了橙色的圆角矩形。我可以使用BackgroundColorSpan将背景设置为该颜色，但是我找不到使它变圆的方法。有什么想法可以实现吗？

提前致谢！

编辑：我正在使用Xamarin.Android，但这是我的代码：

stringBuilder.SetSpan(new BackgroundColorSpan(Application.Context.Resources.GetColor(Resource.Color.orangeColor)), stringBuilder.Length() - length, stringBuilder.Length(), SpanTypes.ExclusiveExclusive);

罗斯福

根据pskink的建议，我设法解决了我的问题。这是我的课：

public class RoundedBackgroundSpan : ReplacementSpan
{
    public override void Draw(Canvas canvas, ICharSequence text, int start, int end, float x, int top, int y, int bottom, Paint paint)
    {
        var rect = new RectF(x, top, x + MeasureText(paint, text, start, end), bottom);
        paint.Color = Application.Context.Resources.GetColor(Resource.Color.nextTimeBackgroundColor);
        canvas.DrawRoundRect(rect, Application.Context.Resources.GetDimensionPixelSize(Resource.Dimension.localRouteDetailsRoundRectValue), Application.Context.Resources.GetDimensionPixelSize(Resource.Dimension.localRouteDetailsRoundRectValue), paint);
        paint.Color = Application.Context.Resources.GetColor(Resource.Color.nextTimeTextColor);
        canvas.DrawText(text, start, end, x, y, paint);
    }

    public override int GetSize(Paint paint, ICharSequence text, int start, int end, Paint.FontMetricsInt fm)
    {
        return Math.Round(MeasureText(paint, text, start, end));
    }

    private float MeasureText(Paint paint, ICharSequence text, int start, int end)
    {
        return paint.MeasureText(text, start, end);
    }
}

用法示例：

var stringBuilder = new SpannableStringBuilder();
var stringToAppend = "hello world";
stringBuilder.Append(stringToAppend);
stringBuilder.SetSpan(new RoundedBackgroundSpan(), stringBuilder.Length() - stringToAppend.Length, stringBuilder.Length(), SpanTypes.ExclusiveExclusive);

本文收集自互联网，转载请注明来源。

如有侵权，请联系[email protected] 删除。