code: private void obtainNegativeButtonText(@NonNull final TypedArray typedArray) {
          setNegativeButtonText(
                  typedArray.getText(R.styleable.DialogPreference_android_negativeButtonText));
      }
docs: Obtains the negative button text of the dialog, which is shown by the preference, from a
  specific typed array.
  
  @param typedArray
  The typed array, the negative button text should be obtained from, as an instance of
  the class {@link TypedArray}. The typed array may not be null