最近项目应用了个库 但是项目可以正常运行 但每次在刷新adapter的时候 会报这个错误 还有大部分崩溃都会这样报错 真是搞得一头雾水 先给大家贴异常，然后是解决方案
java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/animation/AnimatorCompatHelper; at android.support.v7.widget.DefaultItemAnimator.resetAnimation(DefaultItemAnimator.java:515) at android.support.v7.widget.DefaultItemAnimator.animateAdd(DefaultItemAnimator.java:218) at android.support.v7.widget.SimpleItemAnimator.animateAppearance(SimpleItemAnimator.java:114) at android.support.v7.widget.RecyclerView.animateAppearance(RecyclerView.java:3804) at android.support.v7.widget.RecyclerView$4.processAppeared(RecyclerView.java:521) at android.support.v7.widget.ViewInfoStore.process(ViewInfoStore.java:247) at android.support.v7.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:3653) at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3323) at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3844) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1732) at android.widget.LinearLayout.onLayout(LinearLayout.java:1497) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1743) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1586) at android.widget.LinearLayout.onLayout(LinearLayout.java:1495) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336) at android.widget.FrameLayout.onLayout(FrameLayout.java:273) at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2727) at android.view.View.layout(View.java:16673) at android.view.ViewGroup.layout(ViewGroup.java:5476) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2304) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2033) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1209) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6330) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:862) at android.view.Choreographer.doCallbacks(Choreographer.java:674) at android.view.Choreographer.doFrame(Choreographer.java:610) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:848) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loo仔细看会发现很多RecyclerView的错误 然后根据报错信息猜测到应该是重复导读第三方库 并且版本不一样所产生的问题
解决方案
在app的bulid.gradle 加入代码 只要在bulid.gradle 最外层的大括号里面加入就可以
注意 不要直接复制 ，请根据报错信息推测具体错误库 ，然后useVersion 改成当前先用需要使用的版本
configurations.all { resolutionStrategy.eachDependency { DependencyResolveDetails details -> def requested = details.requested if (requested.group == 'com.android.support:recyclerview-v7') { if (!requested.name.startsWith("multidex")) { details.useVersion '25.3.1' } } } }
