TextViewFont (cached)

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="TextViewFont">
    <attr name="typeface" format="string"/>
  </declare-styleable>
</resources>

TextViewFont.java

public class TextViewFont extends TextView {
  public TextViewFont(Context context) {
    this(context, null);
  }

  public TextViewFont(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public TextViewFont(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init(context, attrs);
  }

  @TargetApi(Build.VERSION_CODES.LOLLIPOP)
  public TextViewFont(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    init(context, attrs);
  }

  private void init(Context context, AttributeSet attrs) {
    TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.TextViewFont);
    String typeface = typedArray.getString(R.styleable.TextViewFont_typeface);
    setTypeface(TextViewFontCache.getFont(context, typeface));
    typedArray.recycle();
  }
}

TextViewFontCache.java

public class TextViewFontCache {
  private static final Map<String, Typeface> mapFont = new HashMap<>();

  public static Typeface getFont(Context context, String fontName) {
    Typeface typeface = mapFont.get(fontName);

    if (typeface == null) {
      try {
        typeface = Typeface.createFromAsset(context.getAssets(), fontName);
      } catch (Exception e) {
        typeface = Typeface.DEFAULT;
      }
      mapFont.put(fontName, typeface);
    }
    return typeface;
  }
}