Merge "Modify the code logic of OnLayoutChangeListener in Caption preferences"...

    private final List<Preference> mPreferenceList = new ArrayList<>();

    private final View.OnLayoutChangeListener mLayoutChangeListener =

            new View.OnLayoutChangeListener() {

                @Override

                public void onLayoutChange(View v, int left, int top, int right, int bottom,

                        int oldLeft, int oldTop, int oldRight, int oldBottom) {

                    // Remove the listener once the callback is triggered.

                    mPreviewViewport.removeOnLayoutChangeListener(this);

                    refreshPreviewText();

                }

            };

    @Override

    public int getMetricsCategory() {

        return SettingsEnums.ACCESSIBILITY_CAPTION_PROPERTIES;

        mPreviewWindow = captionPreview.findViewById(R.id.preview_window);

        mPreviewViewport = captionPreview.findViewById(R.id.preview_viewport);

        mPreviewViewport.addOnLayoutChangeListener(

                (v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom)

                        -> refreshPreviewText());

        mPreviewViewport.addOnLayoutChangeListener(mLayoutChangeListener);

        final Resources res = getResources();

        final int[] presetValues = res.getIntArray(R.array.captioning_preset_selector_values);