採用系統字幕設定

在 Android TV 上，我們提供設定讓使用者定義自己的字幕樣式。 本指南說明應用程式如何取得及套用系統提供的 說明文字樣式

在 [設定] > [設定] 下可以找到字幕選項系統 >無障礙功能 >說明文字：

取得 CaptioningManager

透過活動，您可以透過 Context CaptioningManager:

CaptioningManager captioningManager = (CaptioningManager)context.getSystemService(Context.CAPTIONING_SERVICE);

處理字幕樣式變更

接著，您就可以導入 CaptioningChangeListener 來處理字幕樣式變更：

if (captioningManager != null) {
  // Define a class to store the CaptionStyle details.
  CurrentCaptionStyle currentCaptionStyle = new CurrentCaptionStyle;
  // Define the listeners.
  captioningManager.addCaptioningChangeListener(new CaptioningChangeListener() {

    @Override
    public void onEnabledChanged(boolean enabled) {
      super.onEnabledChanged(enabled);
      Log.d(TAG, "onEnabledChanged");
      currentCaptionStyle.isEnabled = enabled;
    }

    @Override
    public void onLocaleChanged(@Nullable Locale locale) {
      super.onLocaleChanged(locale);
      Log.d(TAG, "onLocaleChanged");
      currentCaptionStyle.locale = locale;
    }

    @Override
    public void onFontScaleChanged(float fontScale) {
      super.onFontScaleChanged(fontScale);
      Log.d(TAG, "onFontScaleChanged");
      currentCaptionStyle.fontScale = fontScale;
    }

    @Override
    public void onUserStyleChanged(@NonNull CaptionStyle userStyle) {
      super.onUserStyleChanged(userStyle);
      Log.d(TAG, "onUserStyleChanged");
      currentCaptionStyle.hasBackgroundColor = userStyle.hasBackgroundColor();
      currentCaptionStyle.backgroundColor = userStyle.backgroundColor;
      currentCaptionStyle.backgroundOpcity = userStyle.backgroundColor >>> 24;
      currentCaptionStyle.hasForegroundColor = userStyle.hasForegroundColor();
      currentCaptionStyle.foregroundColor = userStyle.foregroundColor;
      currentCaptionStyle.foregroundOpacity = userStyle.foregroundColor >>> 24;
      currentCaptionStyle.hasWindowColor = userStyle.hasWindowColor();
      currentCaptionStyle.windowColor = userStyle.windowColor;
      currentCaptionStyle.windowOpcity = userStyle.windowColor >>> 24;
      currentCaptionStyle.hasEdgeColor = userStyle.hasEdgeColor();
      currentCaptionStyle.edgeColor = userStyle.edgeColor;
      currentCaptionStyle.hasEdgeType = userStyle.hasEdgeType();
      currentCaptionStyle.edgeType = userStyle.edgeType;
      currentCaptionStyle.typeFace = userStyle.getTypeface();
    }

  });

如要取得系統 CaptionStyle，您可以呼叫 getUserStyle() ：

CaptionStyle systemCaptionStyle = captioningManager.getUserStyle();