Hide system bar while video playing (I've read the FAQ)

Code:
public static class Content extends ImageView implements

        View.OnSystemUiVisibilityChangeListener, View.OnClickListener,

        ActionBar.OnMenuVisibilityListener {

    Activity mActivity;

    TextView mTitleView;

    Button mPlayButton;

    SeekBar mSeekView;

    boolean mAddedMenuListener;

    boolean mMenusOpen;

    boolean mPaused;

    boolean mNavVisible;

    int mLastSystemUiVis;



    Runnable mNavHider = new Runnable() {

        @Override public void run() {

            setNavVisibility(false);

        }

    };



    public Content(Context context, AttributeSet attrs) {

        super(context, attrs);

        setOnSystemUiVisibilityChangeListener(this);

        setOnClickListener(this);

    }



    public void init(Activity activity, TextView title, Button playButton,

            SeekBar seek) {

        // This called by the containing activity to supply the surrounding

        // state of the video player that it will interact with.

        mActivity = activity;

        mTitleView = title;

        mPlayButton = playButton;

        mSeekView = seek;

        mPlayButton.setOnClickListener(this);

        setPlayPaused(true);

    }



    @Override protected void onAttachedToWindow() {

        super.onAttachedToWindow();

        if (mActivity != null) {

            mAddedMenuListener = true;

            mActivity.getActionBar().addOnMenuVisibilityListener(this);

        }

    }



    @Override protected void onDetachedFromWindow() {

        super.onDetachedFromWindow();

        if (mAddedMenuListener) {

            mActivity.getActionBar().removeOnMenuVisibilityListener(this);

        }

    }



    @Override public void onSystemUiVisibilityChange(int visibility) {

        // Detect when we go out of nav-hidden mode, to clear our state

        // back to having the full UI chrome up.  Only do this when

        // the state is changing and nav is no longer hidden.

        int diff = mLastSystemUiVis ^ visibility;

        mLastSystemUiVis = visibility;

        if ((diff&SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0

                && (visibility&SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0) {

            setNavVisibility(true);

        }

    }



    @Override protected void onWindowVisibilityChanged(int visibility) {

        super.onWindowVisibilityChanged(visibility);



        // When we become visible or invisible, play is paused.

        setPlayPaused(true);

    }



    @Override public void onClick(View v) {

        if (v == mPlayButton) {

            // Clicking on the play/pause button toggles its state.

            setPlayPaused(!mPaused);

        } else {

            // Clicking elsewhere makes the navigation visible.

            setNavVisibility(true);

        }

    }



    @Override public void onMenuVisibilityChanged(boolean isVisible) {

        mMenusOpen = isVisible;

        setNavVisibility(true);

    }



    void setPlayPaused(boolean paused) {

        mPaused = paused;

        mPlayButton.setText(paused ? R.string.play : R.string.pause);

        setKeepScreenOn(!paused);

        setNavVisibility(true);

    }



    void setNavVisibility(boolean visible) {

        int newVis = SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN

                | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION

                | SYSTEM_UI_FLAG_LAYOUT_STABLE;

        if (!visible) {

            newVis |= SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_FULLSCREEN

                    | SYSTEM_UI_FLAG_HIDE_NAVIGATION;

        }



        // If we are now visible, schedule a timer for us to go invisible.

        if (visible) {

            Handler h = getHandler();

            if (h != null) {

                h.removeCallbacks(mNavHider);

                if (!mMenusOpen && !mPaused) {

                    // If the menus are open or play is paused, we will not auto-hide.

                    h.postDelayed(mNavHider, 1500);

                }

            }

        }



        // Set the new desired visibility.

        setSystemUiVisibility(newVis);

        mTitleView.setVisibility(visible ? VISIBLE : INVISIBLE);

        mPlayButton.setVisibility(visible ? VISIBLE : INVISIBLE);

        mSeekView.setVisibility(visible ? VISIBLE : INVISIBLE);

    }

}