将两种不同的字体样式应用于 TextView

我想将两种不同的字体样式应用于单个 TextView 中的文本。

我的情况与Android - 两句话，两种样式，一个TextView https://stackoverflow.com/questions/8999781/android-two-sentences-two-styles-one-textview。唯一的区别是我想在整个文本上设置自定义字体。我已将 Helvetica 字体作为资产包含在我的项目中，并希望将该字体应用于 TextView，文本的第一部分将是 Helvetica BOLD，其余部分将是 Helvetica NORMAL。有什么建议可以如何做到吗？

需要以下格式的文本。具有不同样式和单个文本视图的自定义文本。

做到这一点的一种方法是扩展字体跨度 https://stackoverflow.com/questions/4819049/how-can-i-use-typefacespan-or-stylespan-with-custom-typeface:

import android.graphics.Paint;
import android.graphics.Typeface;
import android.text.TextPaint;
import android.text.style.TypefaceSpan;

    public class CustomTypefaceSpan extends TypefaceSpan {
        private final Typeface newType;

        public CustomTypefaceSpan(String family, Typeface type) {
            super(family);
            newType = type;
        }

        @Override
        public void updateDrawState(TextPaint ds) {
            applyCustomTypeFace(ds, newType);
        }

        @Override
        public void updateMeasureState(TextPaint paint) {
            applyCustomTypeFace(paint, newType);
        }

        private static void applyCustomTypeFace(Paint paint, Typeface tf) {
            int oldStyle;
            Typeface old = paint.getTypeface();
            if (old == null) {
                oldStyle = 0;
            } else {
                oldStyle = old.getStyle();
            }

            int fake = oldStyle & ~tf.getStyle();
            if ((fake & Typeface.BOLD) != 0) {
                paint.setFakeBoldText(true);
            }

            if ((fake & Typeface.ITALIC) != 0) {
                paint.setTextSkewX(-0.25f);
            }

            paint.setTypeface(tf);
        }
    }

然后，当您想使用两种不同的字体时，请调用：

String firstWord = "first ";
String secondWord = "second";

// Create a new spannable with the two strings
Spannable spannable = new SpannableString(firstWord+secondWord);

// Set the custom typeface to span over a section of the spannable object
spannable.setSpan( new CustomTypefaceSpan("sans-serif",CUSTOM_TYPEFACE), 0, firstWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannable.setSpan( new CustomTypefaceSpan("sans-serif",SECOND_CUSTOM_TYPEFACE), firstWord.length(), firstWord.length() + secondWord.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

// Set the text of a textView with the spannable object
textView.setText( spannable );