ReactFontManager.java 文件源码

public
@Nullable Typeface getTypeface(
    String fontFamilyName,
    int style,
    AssetManager assetManager) {
  FontFamily fontFamily = mFontCache.get(fontFamilyName);
  if (fontFamily == null) {
    fontFamily = new FontFamily();
    mFontCache.put(fontFamilyName, fontFamily);
  }

  Typeface typeface = fontFamily.getTypeface(style);
  if (typeface == null) {
    typeface = createTypeface(fontFamilyName, style, assetManager);
    if (typeface != null) {
      fontFamily.setTypeface(style, typeface);
    }
  }

  return typeface;
}