code: private void obtainDialogButtonBarDividerMargin(@NonNull final TypedArray typedArray) {
          setDialogDividerMargin(typedArray
                  .getDimensionPixelSize(R.styleable.DialogPreference_dialogDividerMargin, 0));
      }
docs: Obtains the left and right margin of the divider, which is located above the buttons of the
  dialog, which shown by the preference, from a specific typed array.
  
  @param typedArray
  The typed array, the margin should be obtained from, as an instance of the class
  {@link TypedArray}. The typed array may not be null