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ViewPager的setCurrentItem 滑动速度是写死地
下面的方法可以修改,在此以做记录
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public class FixedSpeedScroller extends Scroller { private int mDuration = 1500 ; 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; } } |
使用方法:
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try { Field field = ViewPager. class .getDeclaredField( "mScroller" ); field.setAccessible( true ); FixedSpeedScroller scroller = new FixedSpeedScroller(mViewPager.getContext(), new AccelerateInterpolator()); field.set(mViewPager, scroller); scroller.setmDuration( 2000 ); } catch (Exception e) { LogUtils.e(TAG, "" , e); } |
注意点:
PagerAdapter 的 destroyItem 每次会删除上一个页面,导致,如果做自动切换页面时会看不到动画 .
解决办法:
destoryItem中不做删除view,instantiateItem中对view是否有parent做为判断条件,这种情况适用于,少量的固定的子View,比如一个Banner,banner中做自动循环播放
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原文地址:http://www.cnblogs.com/hudabing/p/4514982.html