public void setNumericTransformer(@Nullable NumericTransformer transformer) {
        mNumericTransformer = transformer != null ? transformer : new DefaultNumericTransformer();
        //We need to refresh the PopupIndicator view
        updateIndicatorSizes();
        updateProgressMessage(mValue);
    }
Sets the current {@link NumericTransformer}

@param transformer
@see #getNumericTransformer()
app/src/main/java/com/duan/musicoco/view/discreteseekbar/DiscreteSeekBar.java