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问题描述
我得到这个错误,但我不知道是什么原因造成它......也许是与事实,这是在一个片段被初始化而不是活动本身。编辑:包括StatsAdapter code
公共类StatsFragment扩展片段{ 私人RecyclerView mRecyclerView;
私人LinearLayoutManager mLinearLayoutManager;
私人RecyclerView.Adapter mAdapter;
私有String [] = myDataset新的String [] {你好,世界,YOLO}; @覆盖
公共无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
} @覆盖
公共查看onCreateView(LayoutInflater吹气,ViewGroup中父母,捆绑savedInstanceState){
视图V = inflater.inflate(R.layout.fragment_stats,父母,假);
mRecyclerView =(RecyclerView)v.findViewById(R.id.cardList);
mRecyclerView.setHasFixedSize(真);
mAdapter =新StatsAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
mLinearLayoutManager =新LinearLayoutManager(getActivity());
mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
返回伏;
}
}公共类StatsAdapter扩展RecyclerView.Adapter< StatsAdapter.ViewHolder> {
私有String [] mDataset; 公共静态类ViewHolder扩展RecyclerView.ViewHolder {
公众的TextView mTextView;
公共ViewHolder(视图v){
超级(五);
mTextView =(TextView中)v.findViewById(R.id.title);
}
} 公共StatsAdapter(字符串[] myDataset){
mDataset = myDataset;
} @覆盖
公共StatsAdapter.ViewHolder onCreateViewHolder(ViewGroup中的父母,INT viewType){
视图V = LayoutInflater.from(parent.getContext())膨胀(R.layout.fragment_stats,父母,假的)。
ViewHolder VH =新ViewHolder(ⅴ);
返回VH;
} @覆盖
公共无效onBindViewHolder(ViewHolder持有人,INT位置){
holder.mTextView.setText(mDataset [位置]);
} @覆盖
公众诠释getItemCount(){
返回mDataset.length;
}
}
解决方案
在 setAdapter
setLayoutManager 行/ p>
I'm getting this error but I don't know what is causing it...perhaps something to do with the fact that this is being initialized in a fragment and not in the activity itself. Edit: included StatsAdapter code
public class StatsFragment extends Fragment {
private RecyclerView mRecyclerView;
private LinearLayoutManager mLinearLayoutManager;
private RecyclerView.Adapter mAdapter;
private String[] myDataset = new String[]{"hello", "world", "yolo"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_stats, parent, false);
mRecyclerView = (RecyclerView) v.findViewById(R.id.cardList);
mRecyclerView.setHasFixedSize(true);
mAdapter = new StatsAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
mLinearLayoutManager = new LinearLayoutManager(getActivity());
mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
return v;
}
}
public class StatsAdapter extends RecyclerView.Adapter<StatsAdapter.ViewHolder> {
private String[] mDataset;
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView mTextView;
public ViewHolder(View v) {
super(v);
mTextView = (TextView) v.findViewById(R.id.title);
}
}
public StatsAdapter(String[] myDataset) {
mDataset = myDataset;
}
@Override
public StatsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_stats, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.mTextView.setText(mDataset[position]);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
解决方案
Move your setLayoutManager
line before setAdapter
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