Merge "Fix leak of WeakReferences on mThemeRefs list." into pi-dev

     */

    private final ArrayList<WeakReference<Theme>> mThemeRefs = new ArrayList<>();

    /**

     * To avoid leaking WeakReferences to garbage collected Themes on the

     * mThemeRefs list, we flush the list of stale references any time the

     * mThemeRefNextFlushSize is reached.

     */

    private static final int MIN_THEME_REFS_FLUSH_SIZE = 32;

    private int mThemeRefsNextFlushSize = MIN_THEME_REFS_FLUSH_SIZE;

    /**

     * Returns the most appropriate default theme for the specified target SDK version.

     * <ul>

        theme.setImpl(mResourcesImpl.newThemeImpl());

        synchronized (mThemeRefs) {

            mThemeRefs.add(new WeakReference<>(theme));

            // Clean up references to garbage collected themes

            if (mThemeRefs.size() > mThemeRefsNextFlushSize) {

                mThemeRefs.removeIf(ref -> ref.get() == null);

                mThemeRefsNextFlushSize = Math.max(MIN_THEME_REFS_FLUSH_SIZE,

                        2 * mThemeRefs.size());

            }

        }

        return theme;

    }