如何测量SpannableString的高度？

Question

我有一个显示不同跨度大小的SpannableString的TextView。我需要知道SpannableString中最后一个单词的确切高度，但我使用的方法是错误的。我做错了什么？

下面是我正在使用的测试代码

    SpannableStringBuilder spannableString = new SpannableStringBuilder("Some Text Some Text Some Text Some Text Some Text Some Text Some Text Some Text Some Text");
    spannableString.setSpan(new AbsoluteSizeSpan(10, true), 0, spannableString.length() / 3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    spannableString.setSpan(new AbsoluteSizeSpan(15, true), spannableString.length()/3, 2 * spannableString.length()/3, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    spannableString.setSpan(new AbsoluteSizeSpan(20, true), 2 * spannableString.length() / 3, spannableString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
    surfaceView.setTranslationY(measureSpannableHeight());

private int measureSpannableHeight() {
    StaticLayout staticLayout = new StaticLayout(spannableString, new TextPaint(), 480, Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
    return staticLayout.getHeight();
}

(表面视图的平移仅用于说明测量方法的高度结果)

Answer 1

构造一个paint对象，在为paint设置等效的span属性后，您可以使用以下内容测量单词高度。

Paint mTextPaint = new Paint();
mTextPaint.setTextSize(20) // your span size
mTextPaint.setTypeface(typeface)

单词的大小将保存在此矩形中

Rect textBounds = new Rect();

int startIndex = spannableString.length() - 4; //length of your last word as start and end indices.
int endIndex = spannableString.length();
mTextPaint.getTextBounds(spannableString, startIndex, endIndex, textBounds); 

int height = textBounds.height();