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