确定android ViewPager中的用户滚动和程序化滚动页面更改

Question

我的应用程序中有android.support.v4.view.ViewPager，我已实现TimerTask自动滚动页面并使用自定义Scroller来缩短页面转换动画时间。我试图在用户手动滚动页面时停止自动滚动。

我从下面的SO问题中听了@Vikram的回答，但程序化滚动被检测为用户滚动。并且在单个滚动中多次调用 viewPager.OnPageChangeListener 。

Differentiating between user scroll and programatic page change in ViewPager

有没有办法在此设置中降低转换速度或区分用户滚动和程序化滚动？

这是我的自定义Scroller类

public class FixedSpeedScroller extends Scroller {

private int mDuration = 1000;

public FixedSpeedScroller(Context context) {
    super(context);
}

public FixedSpeedScroller(Context context, Interpolator interpolator) {
    super(context, interpolator);
}

public FixedSpeedScroller(Context context, Interpolator interpolator, boolean flywheel) {
    super(context, interpolator, flywheel);
}


@Override
public void startScroll(int startX, int startY, int dx, int dy, int duration) {
    // Ignore received duration, use fixed one instead
    super.startScroll(startX, startY, dx, dy, mDuration);
}

@Override
public void startScroll(int startX, int startY, int dx, int dy) {
    // Ignore received duration, use fixed one instead
    super.startScroll(startX, startY, dx, dy, mDuration);
}}

这是我的viewPager设置

public void setUpViewPager() {

    mIndicator = (PageIndicatorView) findViewById(R.id.pivGroupFlyer);
    mPager = (ViewPager) findViewById(R.id.vpGroupFlyer);
    mPager.setAdapter(new GroupFlyerAdapter(this, mFlyerList));

    Field mScroller = null;
    try {
        mScroller = ViewPager.class.getDeclaredField("mScroller");
        mScroller.setAccessible(true);

        FixedSpeedScroller scroller = new FixedSpeedScroller(mPager.getContext(), new DecelerateInterpolator());
        mScroller.set(mPager, scroller);

    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    }

    mIndicator.setVisibility(View.VISIBLE);
    mIndicator.setAnimationType(AnimationType.WORM);
    mIndicator.setRadius(2);
    mIndicator.setViewPager(mPager);

    // Auto start of viewpager
    final Handler handler = new Handler();
    final Runnable Update = new Runnable() {
        public void run() {
            if (currentPage == mFlyerList.size()) {
                currentPage = 0;
                progChange = true;
            }
            progChange = true;
            mPager.setCurrentItem(currentPage++, true);
        }
    };
    final Timer swipeTimer = new Timer();
    swipeTimer.schedule(new TimerTask() {
        @Override
        public void run() {
            handler.post(Update);
        }
    }, 4000, 5000);

    if (!(mFlyerList.size() == 0)) {
        mGroupHeader.setVisibility(View.INVISIBLE);
    }

    mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
            if(positionOffsetPixels == 0 ){

            } else {
                if(progChange) {
                    //programmatically-initiated
                    Log.e("APP", "SCROLL");
                } else {
                    //user-initiated touch scroll
                    Log.e("USER", "SCROLL");
                    swipeTimer.cancel();
                }
                progChange = false;
            }
        }

        @Override
        public void onPageSelected(int position) {

        }

        @Override
        public void onPageScrollStateChanged(int state) {

        }
    });
}