banner exception： java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 5, found: 2000 Pager id: com.tmall.wireless.tangram.example:id/TANGRAM_BANNER_ID Pager class: class com.tmall.wireless.tangram.view.BannerViewPager Problematic adapter: class com.tmall.ultraviewpager.UltraViewPagerAdapter

[megahertz0]

BannerViewPager.java @Override public void setAdapter(PagerAdapter adapter) { if (adapter != null) { if (pagerAdapter == null || pagerAdapter != adapter) { pagerAdapter = (UltraViewPagerAdapter)adapter; pagerAdapter.setCenterListener(this); pagerAdapter.setEnableLoop(enableLoop); //pagerAdapter.setMultiScrRatio(multiScrRatio); constrainLength = 0; super.setAdapter(pagerAdapter); } } else { super.setAdapter(adapter); } } pagerAdapter.setEnableLoop(enableLoop);函数在调用的时候，enableLoop不一定是正确的值，进而导致后续抛出异常

java.lang.IllegalStateException: The application's PagerAdapter changed the 

adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 5, found: 2000 Pager id: com.tmall.wireless.tangram.example:id/TANGRAM_BANNER_ID Pager class: class com.tmall.wireless.tangram.view.BannerViewPager Problematic adapter: class com.tmall.ultraviewpager.UltraViewPagerAdapter at android.support.v4.view.ViewPager.populate(ViewPager.java:1135) at android.support.v4.view.ViewPager.populate(ViewPager.java:1084) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1614) at com.tmall.wireless.tangram.view.BannerViewPager.onMeasure(BannerViewPager.java:75) at android.view.View.measure(View.java:23312) at com.tmall.wireless.tangram.view.BannerView.onMeasure(BannerView.java:384) at android.view.View.measure(View.java:23312) at com.alibaba.android.vlayout.VirtualLayoutManager.measureChildWithDecorationsAndMargin(VirtualLayoutManager.java:1478) at com.alibaba.android.vlayout.VirtualLayoutManager.measureChildWithMargins(VirtualLayoutManager.java:1295) at com.alibaba.android.vlayout.layout.LinearLayoutHelper.layoutViews(LinearLayoutHelper.java:164) at com.alibaba.android.vlayout.layout.BaseLayoutHelper.doLayout(BaseLayoutHelper.java:318) at com.alibaba.android.vlayout.VirtualLayoutManager.layoutChunk(VirtualLayoutManager.java:706) at com.alibaba.android.vlayout.ExposeLinearLayoutManagerEx.fill(ExposeLinearLayoutManagerEx.java:1161) at com.alibaba.android.vlayout.ExposeLinearLayoutManagerEx.onLayoutChildren(ExposeLinearLayoutManagerEx.java:365) at com.alibaba.android.vlayout.VirtualLayoutManager.onLayoutChildren(VirtualLayoutManager.java:504) at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3410) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3962) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:331) at android.widget.FrameLayout.onLayout(FrameLayout.java:269) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:331) at android.widget.FrameLayout.onLayout(FrameLayout.java:269) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:331) at android.widget.FrameLayout.onLayout(FrameLayout.java:269) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656) at android.widget.LinearLayout.onLayout(LinearLayout.java:1565) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:331) at android.widget.FrameLayout.onLayout(FrameLayout.java:269) at com.android.internal.policy.DecorView.onLayout(DecorView.java:1226) at android.view.View.layout(View.java:20793) at android.view.ViewGroup.layout(ViewGroup.java:6264) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2895) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2418) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1536) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7421) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1063) 2019-06-27 15:51:11.041 22101-22101/com.tmall.wireless.tangram.example E/AndroidRuntime: at android.view.Choreographer.doCallbacks(Choreographer.java:875) at android.view.Choreographer.doFrame(Choreographer.java:807) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1049) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:224) at android.app.ActivityThread.main(ActivityThread.java:7104) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:878)