更改TextInputLayout错误字体

Question

是否可以为EditText更改TextInputLayout错误文本字体?

我只能通过app:errorTextAppearance来改变颜色和文字大小。

Answer 1

您可以使用SpannableString来设置字体:

SpannableString s = new SpannableString(errorString);
s.setSpan(new TypefaceSpan(font), 0, s.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mPasswordView.setError(s);

具有特定Typeface集的自定义Span类:

public class TypefaceSpan extends MetricAffectingSpan {
    private Typeface mTypeface;
    public TypefaceSpan(Typeface typeface) {
        mTypeface = typeface;
    }
    @Override
    public void updateMeasureState(TextPaint p) {
        p.setTypeface(mTypeface);
        p.setFlags(p.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
    }
    @Override
    public void updateDrawState(TextPaint tp) {
        tp.setTypeface(mTypeface);
        tp.setFlags(tp.getFlags() | Paint.SUBPIXEL_TEXT_FLAG);
    }
}

Answer 2

另一种方法，如果您喜欢，您可以设置错误颜色或

public static void setErrorTextColor(TextInputLayout textInputLayout, int color, Typeface font) {
  try {
    Field fErrorView = TextInputLayout.class.getDeclaredField("mErrorView");
    fErrorView.setAccessible(true);
    TextView mErrorView = (TextView) fErrorView.get(textInputLayout);
    Field fCurTextColor = TextView.class.getDeclaredField("mCurTextColor");
    fCurTextColor.setAccessible(true);
    fCurTextColor.set(mErrorView, color);
    mErrorView.setTypeface(font);
  } catch (Exception e) {
    e.printStackTrace();
  }
}