片段中的recyclerview的“RecyclerView：没有附加适配器；跳过布局”[重复]

Question

我收到了这个错误，但我不知道是什么原因造成的......也许这与它在片段中而不是在活动本身中初始化的事实有关。编辑：包含 StatsAdapter 代码

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;
    }
}

Answer 1

将setLayoutManager 行移到setAdapter 之前

Answer 2

在onCreate 中创建适配器和“非视图”相关对象。然后将您的适配器用于RecyclerView。

此外，通过根据对象的使用和Activity 生命周期以明确的顺序启动对象来清理您的代码。

public class StatsFragment extends Fragment {

    private RecyclerView mRecyclerView;
    private LinearLayoutManager mLinearLayoutManager;
    private StatsAdapter mAdapter; // was RecyclerView.Adapter mAdapter;
    private String[] myDataset = new String[]{"hello", "world", "yolo"};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 1.
        mAdapter = new StatsAdapter(myDataset);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_stats, parent, false);

        // 2.
        mLinearLayoutManager = new LinearLayoutManager(getActivity());
        mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        // 3.
        mRecyclerView = (RecyclerView) v.findViewById(R.id.cardList);
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setLayoutManager(mLinearLayoutManager);
        mRecyclerView.setAdapter(mAdapter);

        return v;
    }
}

Answer 3

解决此问题的一种方法是将空适配器附加到 RecyclerView

void initializeRecyclerView() {

   recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
   recyclerView.setAdapter(new SampleAdapter(getCurrentActivity()));
   recyclerView.setLayoutManager(new LinearLayoutManager(getCurrentActivity()));
   recyclerView.setHasFixedSize(true);
}