反射机制 控制 viewpager滑动时间

	//反射机制   控制 viewpager滑动时间  为800
	 private void changeViewPageScroller() {
		try {
			Field mField = ViewPager.class.getDeclaredField("mScroller");
			mField.setAccessible(true);
			FixedSpeedScroller scroller;
			scroller = new FixedSpeedScroller(MainActivity.this,new AccelerateDecelerateInterpolator());
			mField.set(mViewPage, scroller);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	class FixedSpeedScroller extends Scroller {
		private int mDuration = 600;

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

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

		@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);
		}

		public void setmDuration(int time) {
			mDuration = time;
		}

		public int getmDuration() {
			return mDuration;
		}

	};