Attempt to read from field 'int android.view.ViewGroup$LayoutParams.width' on a null object referen

E/AndroidRuntime: FATAL EXCEPTION: main
Process: kodulf.swiperefreshlayoutrecyclerviewdemo, PID: 8661
java.lang.NullPointerException: Attempt to read from field 'int android.view.ViewGroup$LayoutParams.width' on a null object reference
at android.view.ViewGroup$LayoutParams.<init>(ViewGroup.java:7547)
at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:7861)
at kodulf.swiperefreshlayoutrecyclerviewdemo.MainActivity$MyAdapter.onCreateViewHolder(MainActivity.java:181)
at kodulf.swiperefreshlayoutrecyclerviewdemo.MainActivity$MyAdapter.onCreateViewHolder(MainActivity.java:161)
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6794)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5975)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5858)

因为inflate的时候：

View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, null, false);
解决办法：
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);

最后

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