code: private void obtainHelperText(@NonNull final TypedArray typedArray) {
          setHelperText(typedArray.getString(R.styleable.AbstractValidateableView_helperText));
      }
docs: Obtains the helper text from a specific typed array.
  
  @param typedArray
  The typed array, the helper text should be obtained from, as an instance of the class
  {@link TypedArray}. The typed array may not be null