code: private void obtainDialogTitle(@NonNull final TypedArray typedArray) {
          CharSequence title = typedArray.getText(R.styleable.DialogPreference_android_dialogTitle);
          setDialogTitle(title != null ? title : getTitle());
      }
docs: Obtains the title of the dialog, which is shown by the preference, from a specific typed
  array.
  
  @param typedArray
  The typed array, the title should be obtained from, as an instance of the class
  {@link TypedArray}. The typed array may not be null