ViewPager切换滑动速度

点击打开链接我们都知道，当我们使用setCurrentItem方法切换ViewPager的页面时，会非常迅速，那么我们该如何改变这个速度呢。因为Google官方将速度写死了，所以我们需要通过反射机制来修改底下修改的代码：

public class FixedSpeedScroller extends Scroller {private int mDuration = 300;public FixedSpeedScroller(Context context) {super(context);}public FixedSpeedScroller(Context context, Interpolator interpolator) {super(context, interpolator);}@Overridepublic void startScroll(int startX, int startY, int dx, int dy, int duration) {// Ignore received duration, use fixed one insteadsuper.startScroll(startX, startY, dx, dy, mDuration);}@Overridepublic void startScroll(int startX, int startY, int dx, int dy) {// Ignore received duration, use fixed one insteadsuper.startScroll(startX, startY, dx, dy, mDuration);}public void setmDuration(int time) {mDuration = time;}public int getmDuration() {return mDuration;}}

在使用viewpager的时候调用该方法

 try {Field field = ViewPager.class.getDeclaredField("mScroller");field.setAccessible(true);FixedSpeedScroller scroller = new FixedSpeedScroller(viewPager.getContext(),new DecelerateInterpolator());field.set(viewPager, scroller);scroller.setmDuration(2000);} catch (Exception e) {}