android SpannableStringBuilder设置自定义字体

出现了什么问题?

private final SpannableStringBuilder mSpannableStringBuilder = new SpannableStringBuilder();

Typeface   mCustomFont = Typeface.createFromAsset(getActivity().getAssets(), "fonts/DIN Alternate Bold.ttf");

mSpannableStringBuilder.setSpan(mCustomFont , 0, mSpannableStringBuilder.toString().indexOf(Constants.N), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textView.setText(mSpannableStringBuilder);

• 设置字体无效,还是原生的字体

解决办法

1. 自定义一个字体的类

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);
    }
}

1. 然后设置字体的方法变化一下

private final SpannableStringBuilder mSpannableStringBuilder = new SpannableStringBuilder();

Typeface   mCustomFont = Typeface.createFromAsset(getActivity().getAssets(), "fonts/DIN Alternate Bold.ttf");
// mCustomFont-->>new CustomTypefaceSpan(textView.getText().toString()
mSpannableStringBuilder.setSpan(new CustomTypefaceSpan(textView.getText().toString(),mCustomFont), 0, mSpannableStringBuilder.toString().indexOf(Constants.N), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

textView.setText(mSpannableStringBuilder);