片段中的RecyclerView

Question

我将按照此处的Android文档示例在 Fragment设置RecyclerView 。

我在下面粘贴了我的代码，没有太多。 （唯一的区别是我使用的是片段而不是活动）。

我得到的错误是：

java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.

在线解决这个问题的所有方法都是在布局膨胀中为片段添加false论点。 但是我已经做到了，但仍然出现错误。

我的代码：

主要活动

...
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containerView,new NewsFragment()).commit();
...

新闻片段

public class NewsFragment extends Fragment {

    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

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

        mRecyclerView = (RecyclerView) v.findViewById(R.id.my_recycler_view);
        mRecyclerView.setHasFixedSize(true);

        mLayoutManager = new LinearLayoutManager(getActivity());
        mRecyclerView.setLayoutManager(mLayoutManager);

        mAdapter = new NewsAdapter(new String[]{"hello","world","qwert","test","greg","peck"});
        mRecyclerView.setAdapter(mAdapter);

        return v;

    }
}

新闻适配器

public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {
    private String[] mDataset;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;

        public ViewHolder(TextView tv) {
            super(tv);
            mTextView = tv;
        }
    }

    public NewsAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    @Override
    public NewsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                   int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.news_item, parent, false);

        TextView tv = (TextView)v.findViewById(R.id.textView2);
        ViewHolder vh = new ViewHolder(tv);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.mTextView.setText(mDataset[position]);
    }

    @Override
    public int getItemCount() {
        return mDataset.length;
    }
}

任何帮助将不胜感激！

Answer 1

错误在此行上：

TextView tv = (TextView)v.findViewById(R.id.textView2);
ViewHolder vh = new ViewHolder(tv);

更改为：

TextView tv = (TextView)v.findViewById(R.id.textView2);
ViewHolder vh = new ViewHolder(v);

文本视图已经有一个父级。 这就是为什么您会收到此错误。

更新的代码：

public class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {
    private String[] mDataset;

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public TextView mTextView;

        public ViewHolder(View view) {
            super(tv);
           mTextView= (TextView)view.findViewById(R.id.textView2);
        }
    }

    public NewsAdapter(String[] myDataset) {
        mDataset = myDataset;
    }

    @Override
    public NewsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
                                                   int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.news_item, 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;
    }
}