code: private void obtainStepSize(@NonNull final TypedArray typedArray) {
          int defaultValue = getContext().getResources()
                  .getInteger(R.integer.number_picker_preference_default_step_size);
          setStepSize(typedArray
                  .getInteger(R.styleable.AbstractNumericPreference_stepSize, defaultValue));
      }
docs: Obtains the step size, the number should be increased or decreased by when moving the
  selector wheel, form a specific typed array.
  
  @param typedArray
  The typed array, the step size should be obtained from, as an instance of the class
  {@link TypedArray}. The typed array may not be null