android 自定义span_android – 我如何使用TypefaceSpan或StyleSpan与自定义字体？

要使用TypefaceSpan或StyleSpan与自定义字体，您需要创建一个自定义的TypefaceSpan或StyleSpan类，并在其中设置您想要使用的字体。

以下是一个示例TypefaceSpan类的代码，它允许您设置自定义字体：

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);
    }
}

要使用此自定义TypefaceSpan类，您可以使用以下代码：

Typeface customTypeface = Typeface.createFromAsset(getAssets(), "fonts/your_custom_font.ttf");
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder("Your text here");
CustomTypefaceSpan customTypefaceSpan = new CustomTypefaceSpan("", customTypeface);
spannableStringBuilder.setSpan(customTypefaceSpan, 0, spannableStringBuilder.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
yourTextView.setText(spannableStringBuilder);

同样，您也可以创建一个自定义的StyleSpan类，以设置自定义字体：

public class CustomStyleSpan extends StyleSpan {

    private final Typeface newType;

    public CustomStyleSpan(int style, Typeface type) {
        super(style);
        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，您可以使用以下代码来设置自定义字体：

Typeface customTypeface = Typeface.createFromAsset(getAssets(), "fonts/your_custom_font.ttf");
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder("Your text here");
CustomStyleSpan customStyleSpan = new CustomStyleSpan(Typeface.BOLD_ITALIC, customTypeface);
spannableStringBuilder.setSpan(customStyleSpan, 0, spannableStringBuilder.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
yourTextView.setText(spannableStringBuilder);