在关于RecyclerViews的许多教程之后，我一直让我的应用程序崩溃：
View view = inflater.inflate(R.layout.layout_listitem, parent, false);
这可能是由于上下文为null，因此inflater对象为null：
LayoutInflater inflater = LayoutInflater.from(context);
但是，如果我在RecyclerViewAdapter的构造函数中传递上下文，我不明白为什么它为null：
public RecycleViewAdapter(Context context) {
this.context = context;
}
来自我的片段活动：
View view = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.matches);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(new RecycleViewAdapter(getActivity()));
return view;
我尝试过getContext（），getActivity（），我甚至重写onAttach方法从那里获取上下文并仍然崩溃。我是新手使用片段所以我真的不知道我在做什么，只是使用人们在论坛上尝试的解决方案。
logcat的：
09-07 09:48:14.433 7594-7594/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: maginate.net.thebestrapper, PID: 7594
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:722)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:813)
at android.view.LayoutInflater.inflate(LayoutInflater.java:511)
at android.view.LayoutInflater.inflate(LayoutInflater.java:415)
at maginate.net.thebestrapper.RecycleViewAdapter.onCreateViewHolder(RecycleViewAdapter.java:40)
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6685)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5869)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3529)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1702)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1556)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1702)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1556)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1702)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1556)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1465)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:16916)
at android.view.ViewGroup.layout(ViewGroup.java:5405)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2413)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2122)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1264)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6942)
at
方法1： - 使用适配器构造函数传递父上下文，然后使用构造函数上下文。
方法2： - 像这样使用父上下文： -
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
this.context = parent.getContext();
RecyclerView.ViewHolder vh;
View v = LayoutInflater.from(context).inflate(R.layout.anylayout, parent, false);
vh = new RowVH(v);
return vh;
}
你不需要将Context实例传递给你的Adapter。
确保您只尝试在适配器的onCreateViewHolder()方法中绑定布局，您可以从Context参数获取parent：
new YourViewHolderClass(LayoutInflater.from(parent.getContext()).inflate(R.layout.your_layout_xml, parent, false));