Android - Custom view attributes with a custom font

README.md

1. Download Permanent Marker font from random internet site: https://www.fontsquirrel.com/fonts/permanent-marker
2. Copy the PermanentMarker.ttf file into assets directory (should be the same level as res directory NOT inside res directory). You may have to create the assets directory yourself in Finder.
3. The attrs.xml file below should be in /res/values/

activity_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  
    <com.your.package.CustomFontTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/take_a_photo"
        android:textSize="40sp"
        app:font="PermanentMarker" />
                
</LinearLayout>

attrs.xml

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

CustomFontTextView.java

public class CustomFontTextView extends TextView {

    public CustomFontTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CustomFontTextView, 0, 0);
        try {
            String fontName = ta.getString(R.styleable.CustomFontTextView_text_font);
            this.setTypeface(Font.fromString(context, fontName));
        } finally {
            ta.recycle();
        }
    }

}

Font.java

public class Font {

    public static Typeface fromString(Context context, String fontName) {
        if (fontName == null) {
            return Typeface.DEFAULT;
        }

        Typeface font = Typeface.createFromAsset(context.getApplicationContext().getAssets(), fontName + ".ttf");
        return font == null ? Typeface.DEFAULT : font;
    }

}