部分文本的不同字体答案

【问题标题】：Different typeface for parts of text部分文本的不同字体
【发布时间】：2016-06-24 20:23:09
【问题描述】：

我有两种字体，我想使用 Typeface1 作为标题，使用 Typeface2 作为正文。

有没有办法做到这一点？如果有帮助，我可以在标题周围添加标签，例如 <b>Title</b>

Typeface typeface1 = Typeface.createFromAsset(getAssets(), "fonts/Typeface1.ttf");
Typeface typeface2 = Typeface.createFromAsset(getAssets(), "fonts/Typeface2.ttf");
textView.setTypeface(typeface1);

textView.setText("<b>Title 1</b>\n" +
                "Body 1\n" +
                "<b>Title 2</b>\n" +
                "Body 2\n" +
                "<b>Title 3</b>\n" +
                "Body 3");

【问题讨论】：

标签： android

【解决方案1】：

您需要使用Html.fromHtml() 在您的 XML 字符串中使用 HTML。在您的布局 XML 中简单地引用带有 HTML 的字符串是行不通的。

例子：

textView.setText(Html.fromHtml("<b>Title</b><br>Body1<br><b>Title2</b><br>Body2"));

这可能有效

【讨论】：

【解决方案2】：

尝试使用SpannableStringBuilder 中提供的this answer

TextView txt = (TextView) findViewById(R.id.custom_fonts);  
Typeface font = Typeface.createFromAsset(getAssets(), "font1.ttf");
Typeface font2 = Typeface.createFromAsset(getAssets(), "font2.ttf");   
SpannableStringBuilder spannableStringBuilder  = new SpannableStringBuilder("TextTextText");
spannableStringBuilder.setSpan (new CustomTypefaceSpan("", font2), start, end, Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
spannableStringBuilder.setSpan (new CustomTypefaceSpan("", font), start, end, Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
txt.setText(SS);

CustomTypefaceSpan.java

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);
}
}

【讨论】：

【解决方案3】：

不建议混合使用字体和 html 标签。
要在 textview 中使用 html 标签，请参阅（Satish Kumar 的）答案。

textView.setText("<b>Title 1</b>\n" +
                "Body 1\n" +
                "<b>Title 2</b>\n" +
                "Body 2\n" +
                "<b>Title 3</b>\n" +
                "Body 3");

要在同一个文本视图中使用多种字体，

TextView txt = (TextView) findViewById(R.id.custom_fonts);  
        txt.setTextSize(30);
        Typeface font = Typeface.createFromAsset(getAssets(), "Akshar.ttf");
        Typeface font2 = Typeface.createFromAsset(getAssets(), "bangla.ttf");   
        SpannableStringBuilder SS = new SpannableStringBuilder("আমারநல்வரவு");
        SS.setSpan (new CustomTypefaceSpan("", font2), 0, 4,Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        SS.setSpan (new CustomTypefaceSpan("", font), 4, 11,Spanned.SPAN_EXCLUSIVE_INCLUSIVE);
        txt.setText(SS);

CustomTypefaceSpan 类：

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);
        }
    }

参考资料：
* Multiple TypeFaces
* Span styles and custom typefaces

【讨论】：