如何使用自定义字体设置 Spannable 对象字体

Question

我有 Spannable 对象，我想通过之前加载的自定义字体来设置其字体。

Typeface tf = Typeface.createFromAsset(getAssets(), "fonts/font_Name.ttf");
Spannable span1 = /*Spannable Item*/;

/// I want to set span1 to have tf font face???
/// Here where I want help.

编辑：
我的问题是我想为文本视图设置两种不同的自定义字体，所以我正在使用 Spannable

Answer 1

这是一个迟到的答案，但将帮助其他人解决问题。

使用以下代码：（我使用孟加拉语和泰米尔语字体）

  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);

---

结果是：

---

CustomTypefaceSpan 类：

package my.app;
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

Answer 2

创建 CustomTypefaceSpan 类：

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

public class CustomTypefaceSpan extends MetricAffectingSpan {

    private final Typeface typeface;

    public CustomTypefaceSpan(Typeface typeface) {
        this.typeface = typeface;
    }

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

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

    private static void applyCustomTypeFace(Paint paint, Typeface tf) {
        paint.setTypeface(tf);
    }
}

使用与 Android 框架跨类相同的方式：

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

此答案基于 Imran Rana 的答案，但不会扩展 TypefaceSpan ，然后禁用其功能。 CustomTypefaceSpan 直接扩展 MetricAffectingSpan。

这个答案与伊姆兰·拉纳的答案有一个缺陷。跨度没有被分割。即，如果您这样做（kotlin）：

    val parcel = Parcel.obtain()
    TextUtils.writeToParcel(spannableStringBuilder, parcel, 0)
    parcel.setDataPosition(0)
    val sequence = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel)
    parcel.recycle()

在 spannableStringBuilder 上设置的任何 CustomTypefaceSpan 对象将不会被编组和解组。

Answer 3

我们不需要使用 CustomTypefaceSpan。这是使用 StyleSpan 的解决方案。

/**
* setCustomFontTypeSpan
* @param context
* @param source
* @param startIndex
* @param endIndex
* @param font
* @return
*/
public static SpannableString setCustomFontTypeSpan(Context context, String 
source, int startIndex, int endIndex, int font) {
      final SpannableString spannableString = new SpannableString(source);
      Typeface typeface = ResourcesCompat.getFont(context, font);
      spannableString.setSpan(new StyleSpan(typeface.getStyle()), 
      startIndex,endIndex,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
return spannableString;
}

String source = "Hello world";
SpannableString string = setCustomFontTypeSpan(context, source, 6, 
source.length(), R.font.open_sans_bold);
textView.setText(string);

Answer 4

如果您使用的是 Roboto，您可以在构造函数中设置不同的 TypefaceSpan

TypefaceSpan typefaceSpan = new TypefaceSpan("sans-serif-medium");

textView.setSpan(typefaceSpan, indexStart, textLength, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

Answer 5

如果您使用的是 android KTX buildSpannable{...}，

我推荐这个。

inline fun SpannableStringBuilder.font(typeface: Typeface? = null, builderAction: SpannableStringBuilder.() -> Unit) =
    inSpans(StyleSpan(typeface?.style ?: Typeface.DEFAULT.style), builderAction = builderAction)

用法

binding.title.text = buildSpannedString {
    color(getColor(R.color.main_mint)) {
        font(getFont(R.font.notosans_medium)) {
            append("colored and typefaced")
        }
    }
}

Answer 6

>= API 28 的更新、更简单的答案

val myTypeface = Typeface.create(ResourcesCompat.getFont(context, R.font.acme), Typeface.NORMAL)
val string = SpannableString("Text with typeface span.")
string.setSpan(TypefaceSpan(myTypeface), 10, 18, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
string.setSpan(TypefaceSpan("monospace"), 19, 22, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)

textView.text = string

Answer 7

我想做同样的事情，但我发现我需要使用 TypefaceSpan。问题是采用 Typeface 的构造函数仅在 API 级别 28 中添加。因此我发现的解决方法是执行以下操作：

val spannable = SpannableString("My String")
spannable.setSpan(object : TypefaceSpan(null) {
    override fun updateDrawState(ds: TextPaint) {
        ds.typeface = Typeface.create(ResourcesCompat.getFont(context, R.font.my_font), Typeface.NORMAL) // To change according to your need
    }
}, start, end, Spannable.SPAN_INCLUSIVE_EXCLUSIVE) // To change according to your need
myTextView.setText(spannable)

Answer 8

在 kotlin 中是：

第一步，创建这个类

class CustomTypefaceSpan(family: String?, private val newType: Typeface) :
  TypefaceSpan(family) {
  override fun updateDrawState(ds: TextPaint) {
      applyCustomTypeFace(ds, newType)
  }

  override fun updateMeasureState(paint: TextPaint) {
      applyCustomTypeFace(paint, newType)
  }

  companion object {
      private fun applyCustomTypeFace(paint: Paint, tf: Typeface) {
          val oldStyle: Int
          val old = paint.typeface
          oldStyle = old?.style ?: 0
          val fake = oldStyle and tf.style.inv()
          if (fake and Typeface.BOLD != 0) {
              paint.isFakeBoldText = true
          }
          if (fake and Typeface.ITALIC != 0) {
              paint.textSkewX = -0.25f
          }
          paint.typeface = tf
      }
  }

}

第二步，

    val prefixText = SpannableString("I read and accept ")
    val prefixTextLen = prefixText.length

    prefixText.setSpan(
        CustomTypefaceSpan("", ResourcesCompat.getFont(context, R.font.gotham_bold)!!),
        0,
        prefixTextLen,
        0
    )

Answer 9

首先尝试将您的 Spannable 设置为您的 TextView，然后尝试使用 myTextView.setTypeface(tf) 将字体分配给您的 TextView );;

Answer 10

这是一个示例，其中 str 是完整字​​符串，boldString 是需要加粗的部分。

public static SpannableString getTextStyleSpan(String str, String boldString) {

        SpannableString formated = new SpannableString(str);

        int start1 = str.indexOf(boldString);
        int end1 = start1 + colorString1.length();

        formated.setSpan(new android.text.style.StyleSpan(android.graphics.Typeface.BOLD), start1, end1, Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        return formated;
    }