RecyclerView Bug：IndexOutOfBound

RecyclerView是Android-support-v7-21版本中新增的一个Widget，RecyclerView在刷新数据的时候会出现以下异常：

java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid view holder adapter positionViewHolder{431a7450 position=1 id=-1, oldPos=-1, pLpos:-1 scrap [attachedScrap] tmpDetached no parent}  
    at android.support.v7.widget.RecyclerView$Recycler.validateViewHolderForOffsetPosition(RecyclerView.java:4251)  
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4382)  
    at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363)  
    at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961)  
    at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370)  
    at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333)  
    at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562)  
    at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900)  
    at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:584)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)  
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)  
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)  
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)  
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)  
    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)  
    at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
    at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
    at android.view.View.layout(View.java:14828)  
    at android.view.ViewGroup.layout(ViewGroup.java:4631)  
    at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2074)  
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1831)  
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1087)  
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5696)  
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)  
    at android.view.Choreographer.doCallbacks(Choreographer.java:574)  
    at android.view.Choreographer.doFrame(Choreographer.java:544)  
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)  
    at android.os.Handler.handleCallback(Handler.java:733)  
    at android.os.Handler.dispatchMessage(Handler.java:95)  
    at android.os.Looper.loop(Looper.java:136)  
    at android.app.ActivityThread.main(ActivityThread.java:5016)  
    at java.lang.reflect.Method.invokeNative(Native Method)  
    at java.lang.reflect.Method.invoke(Method.java:515)  
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)  
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)  
    at dalvik.system.NativeStart.main(Native Method)  

大家看这个代码，只是并没有报到我们自己的代码里面来，在底层就崩溃了，在app层面并没有，弹出一个框，说应用程序已奔溃，而是直接就没了，用户感觉很奇怪。这种异常并不是很容易出现，而是偶尔出现，我的也是在后台奔溃日志中，发现了这种异常，我们自己都不知道什么地方报错的，搜索百度，发现有个链接的权重比较高，看的人也比较多：
http://drakeet.me/recyclerview-bug-indexoutofboundsexception-inconsistency-detected-invalid-item-position-solution?utm_source=tuicool&utm_medium=referral
但是，这篇文章写得比较模糊，解决方案也只是给出一个代码片段，我都不知道怎么加进去，之后我用google去搜索，发现这个问题很普遍，很多都是偶尔出现，很难去重现他，终于在stackoverflow上找到了一个解决方法，链接如下：

http://stackoverflow.com/questions/31759171/recyclerview-and-Java-lang-indexoutofboundsexception-inconsistency-detected-in

其实也不是什么解决方法，只是把这个异常捕获了，不让他奔溃了，这个问题的终极解决方案还是得让google去修复。

1、创建一个类LinearLayoutManagerWrapper继承LinearLayoutManager，重写onLayoutChildren方法

public class WrapContentLinearLayoutManager extends LinearLayoutManager {  
    public WrapContentLinearLayoutManager(Context context) {  
        super(context);  
    }  
  
    public WrapContentLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {  
        super(context, orientation, reverseLayout);  
    }  
  
    public WrapContentLinearLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {  
        super(context, attrs, defStyleAttr, defStyleRes);  
    }  
  
    @Override  
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {  
        try {  
            super.onLayoutChildren(recycler, state);  
        } catch (IndexOutOfBoundsException e) {  
            e.printStackTrace();  
        }  
    }  
}  

2、设置RecyclerView的布局管理为WrapContentLinearLayoutManager对象

mRecyclerView.setLayoutManager(new WrapContentLinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));  

我经过大量的测试，发现这个异常真的被catch了，没有再出现这种崩溃的问题了，大功告成，希望对大家有所帮助！！！