ViewPager标签栏滑条

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主要实现是依靠ViewPager设置OnPageChangeListener监听。

mViewPager.setOnPageChangeListener(new OnPageChangeListener() {@Overridepublic void onPageSelected(int arg0) {// TODO Auto-generated method stubLog.d("onPageSelected", ""+arg0);if(!mIsBeChoose)mChooseBar.setCurrentPosition(arg0);}@Overridepublic void onPageScrolled(int position, float arg1, int positionOffsetPixels) {// TODO Auto-generated method stubLog.i("onPageScrolled", ""+position+" "+arg1+" "+positionOffsetPixels);mSlideLayout.scrollTo((int) (-(position+arg1)*mWidthOfSlideBlock), 0);}@Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stubif(arg0 == 0){    mIsBeChoose = false;}Log.e("onPageScrollStateChanged", ""+arg0);}});

关键是要理解onPageScrolled()函数的各个参数的含义：第一个参数position是当前屏幕显示的页中页号的最小值，然后第二个参数是页号最小的页占当前占屏幕的百分比。然后注意scrolleTo的原理，就可以写出调用的式子：mSlideLayout.scrollTo((int) (-(position+arg1)*mWidthOfSlideBlock), 0);

源码：https://github.com/HOOOOOO/ViewPagerSlideBlock

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