My Custom Font class
public class CustomFontText extends TextView {
    /*
  * Caches typefaces based on their file path and name, so that they don't have to be created every time when they are referenced.
  */
    private static Typeface mTypeface;
    public CustomFontText(final Context context) {
        super(context, null);
    }
    public CustomFontText(final Context context, final AttributeSet attrs) {
        super(context, attrs, 0);
        readAttrs(context, attrs);
    }
    public CustomFontText(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        readAttrs(context, attrs);
    }
    private void readAttrs(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomTextView);
        // Read the title and set it if any
        String fontName = a.getString(R.styleable.CustomTextView_fontname);
        if (fontName != null) {
            // We have a attribute value
            if (mTypeface == null) {
                mTypeface = Typeface.createFromAsset(context.getAssets(), fontName);
                setTypeface(mTypeface);
            }
        }
        // a.recycle();
    }
}
Applying in XMl file
<somepackage.CustomFontText
            android:id="@+id/details"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ewfewfewqfewfwef"
            custom:fontname="Roboto-Regular.ttf" />
It is not giving any kind of error but I am not able to view any changes in the textview. Changing the fontname makes no difference.
 
     
     
     
    