学习ViewPage实现无限左右滑动

Question

本帖最后由 xtdhwl 于 2012-12-13 15:52:10 编辑

Answer 1

下面是log，可以看出viewPage还是很轻量级的 调用instantiateItem3次
12-13 15:52:01.469: I/MainActivity(12066): getCount
12-13 15:52:01.469: I/MainActivity(12066): getCount
12-13 15:52:01.479: I/MainActivity(12066): startUpdate
12-13 15:52:01.479: I/MainActivity(12066): startUpdate
12-13 15:52:01.479: I/MainActivity(12066): getCount
12-13 15:52:01.479: I/MainActivity(12066): instantiateItem
12-13 15:52:01.479: I/MainActivity(12066): getPageWidth position:1073741823
12-13 15:52:01.479: I/MainActivity(12066): instantiateItem
12-13 15:52:01.479: I/MainActivity(12066): getPageWidth position:1073741822
12-13 15:52:01.479: I/MainActivity(12066): instantiateItem
12-13 15:52:01.479: I/MainActivity(12066): getPageWidth position:1073741824
12-13 15:52:01.479: I/MainActivity(12066): getCount
12-13 15:52:01.479: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.479: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.479: I/MainActivity(12066): finishUpdate
12-13 15:52:01.479: I/MainActivity(12066): finishUpdate
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.479: I/MainActivity(12066): startUpdate
12-13 15:52:01.479: I/MainActivity(12066): startUpdate
12-13 15:52:01.479: I/MainActivity(12066): getCount
12-13 15:52:01.479: I/MainActivity(12066): getCount
12-13 15:52:01.479: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.479: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.479: I/MainActivity(12066): finishUpdate
12-13 15:52:01.479: I/MainActivity(12066): finishUpdate
12-13 15:52:01.489: I/MainActivity(12066): startUpdate
12-13 15:52:01.489: I/MainActivity(12066): startUpdate
12-13 15:52:01.489: I/MainActivity(12066): getCount
12-13 15:52:01.489: I/MainActivity(12066): getCount
12-13 15:52:01.489: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.499: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.499: I/MainActivity(12066): finishUpdate
12-13 15:52:01.499: I/MainActivity(12066): finishUpdate
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.499: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): startUpdate
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): getCount
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem
12-13 15:52:01.509: I/MainActivity(12066): setPrimaryItem position:1073741823
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): finishUpdate
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.509: I/MainActivity(12066): isViewFromObject
12-13 15:52:01.539: I/MainActivity(12066): getCount

Answer 2

如果滑到最后一页就让它跳到一个新的Activity去，请问怎么实现好？

Answer 3

Viewpager 的效果是挺好的 

Answer 4

ViewPage有监听接口mViewPager.setOnPageChangeListener(new OnPageChangeListener())
我认为ViewPage需要PageAdapter去释放资源，Gallery内部来释放资源
现在感觉项目中使用ViewPage要比Gallery要多git上有一个开源的CirclePageIndicator ，配合ViewPage很不错