How to use isInEditMode() to see layout with custom View in the editor

public class CustomTextView extends TextView {

public CustomTextView(Context context) {
    super(context);
}

public CustomTextView(Context context, AttributeSet attrs) {
    super(context, attrs);

    if (!isInEditMode()) {
        createTypeface(context, attrs); //whatever added functionality you are trying to add to Widget, call that inside this condition. 
    }

}

public CustomTextView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}


//Typeface I wan to set to my Custom TextView It can be any other functionality of your choice

private void createTypeface(Context context, AttributeSet attrs) {

    TypedArray styledAttrs = context.obtainStyledAttributes(attrs,
            R.styleable.CustomTextView);
    String fontName = styledAttrs
            .getString(R.styleable.CustomTextView_Typeface);
    styledAttrs.recycle();

    if (fontName != null) {
        Typeface typeface = Typeface.createFromAsset(context.getAssets(),
                "fonts/" + fontName);

        setTypeface(typeface);
        styledAttrs.recycle();
    }
}

}

isInEditMode()should be used inside the Custom View constructor. Try the following code:

     public class GraphView extends View implements Grapher
        {

         public GraphView(Context context, AttributeSet attrs) {
                super(context, attrs);
                if(!isInEditMode())
                 init(context);
            }

            public GraphView(Context context) {
                super(context);
               if(!isInEditMode()){
                touchHandler = new TouchHandler(this);
                init(context);
              }
            }