fontawaretextappearance_the_fix__fontawarespan.kt

class FontAwareTextAppearanceSpan(
    private val context: Context,
    private val appearance: Int
) : TextAppearanceSpan(context, appearance) {

    private var font: Typeface? = null

    override fun updateMeasureState(ds: TextPaint) {
        super.updateMeasureState(ds)

        val font = getFont() ?: Typeface.DEFAULT
        val oldStyle = ds.typeface?.style ?: 0
        ds.typeface = Typeface.create(font, oldStyle)
    }

    private fun getFont(): Typeface? {
        if (font != null) {
            return font
        }

        val cleanFamilyName = getFontFamilyName() ?: return null
        val appPackageName = context.applicationContext.packageName
        val id = context.resources.getIdentifier(cleanFamilyName, "font", appPackageName)
        return getFont(context, id).also { font = it }
    }

    private fun getFontFamilyName(): String? {
        val attrs = intArrayOf(R.attr.fontFamilyName)
        val a = context.obtainStyledAttributes(appearance, attrs)
        val fontFamilyName = a.getString(0)
        a.recycle()

        return fontFamilyName
    }
}