改变ViewPager的内容之间切换动画的速度

自定义Scroller

<span style="font-size:18px;">public class ViewPagerScroller extends Scroller {
	private int mDuration;

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

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

	public void setDuration(int mDuration) {
		this.mDuration = mDuration;
	}

	@Override
	public void startScroll(int startX, int startY, int dx, int dy) {
		super.startScroll(startX, startY, dx, dy, this.mDuration);
	}

	@Override
	public void startScroll(int startX, int startY, int dx, int dy, int duration) {
		super.startScroll(startX, startY, dx, dy, this.mDuration);
	}

}</span>

ViewPager.java源码内容里边有

 private Scroller mScroller;

 void initViewPager() {
        setWillNotDraw(false);
        setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
        setFocusable(true);
        final Context context = getContext();
        mScroller = new Scroller(context, sInterpolator);
	......
私有属性没有对外提供接口那么就用反射吧

private void setViewPagerScrollSpeed(ViewPager viewPager, int speed) {
        try {
            Field field = ViewPager.class.getDeclaredField("mScroller");
            field.setAccessible(true);
            ViewPagerScroller viewPagerScroller = new ViewPagerScroller(viewPager.getContext(), new OvershootInterpolator(0.6F));
            field.set(viewPager, viewPagerScroller);
            viewPagerScroller.setDuration(speed);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
这样就可以设置滑动切换速度了！