如何将数据从Recyclerview传递到Fragment

我有一个填充在Fragment中的recyclelerView，我想启动一个新的Fragment并从适配器传递数据，我尝试使用Bundles但它总是给我的适配器类的null值

public class RecyclerAdapter extends RecyclerView.Adapter { private LayoutInflater inflater; private List mList; private FragmentCommunication mCommunicator; public RecyclerAdapter(Context context, List list,FragmentCommunication communication) { inflater = LayoutInflater.from(context); mList = list; mCommunicator=communication; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = inflater.inflate(R.layout.single_row, parent, false); MyViewHolder holder = new MyViewHolder(view,mCommunicator); return holder; } @Override public void onBindViewHolder(final MyViewHolder holder, final int position) { final Information current = mList.get(position); holder.name.setText(current.name); holder.job.setText(current.job); FragmentB fragmentB=new FragmentB(); Bundle bundle=new Bundle(); bundle.putString("NAME",current.name); bundle.putString("JOB",current.job); fragmentB.setArguments(bundle); } @Override public int getItemCount() { return mList.size(); } public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { TextView name; TextView job; FragmentCommunication mComminication; public MyViewHolder(View itemView, FragmentCommunication Communicator) { super(itemView); name = (TextView) itemView.findViewById(R.id.tv_name); job = (TextView) itemView.findViewById(R.id.tv_gob); mComminication=Communicator; name.setOnClickListener(this); } @Override public void onClick(View view) { mComminication.respond(getAdapterPosition()); } } 

这是我要发布的新片段

 public class FragmentB extends Fragment { TextView textview; TextView textView2; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view= inflater.inflate(R.layout.fragment_b,container,false); textview= (TextView) view.findViewById(R.id.tv_name); textView2= (TextView) view.findViewById(R.id.tv_job); return view; } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); Bundle arguments = getArguments(); if (arguments!=null){ String name= arguments.get("NAME").toString(); String job= arguments.get("JOB").toString(); textview.setText(name); textView2.setText(job);} } 

}

这就是我如何通过接口连接Fragment和recyclerview Adapter

 public interface FragmentCommunication { void respond(int position); 

}

这就是填充了recyclerview的片段

 public class RecyclerViewFragment extends Fragment { RecyclerView mRecyclerView; RecyclerAdapter mRecyclerAdapter; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view= inflater.inflate(R.layout.recycler_fragment,container,false); mRecyclerView= (RecyclerView) view.findViewById(R.id.recycler); mRecyclerAdapter=new RecyclerAdapter(getActivity(),getData(),communication); mRecyclerView.setAdapter(mRecyclerAdapter); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); return view; } public static List getData() { Listdata=new ArrayList(); String[] names={"ahmed","mohammed"}; String[] jobs={"sacsd","csscs"}; for (int i=0;i<names.length;i++){ Information current=new Information(); current.name=(names[i]); current.job=(jobs[i]); data.add(current); } return data; } FragmentCommunication communication=new FragmentCommunication() { @Override public void respond(int position) { FragmentB fragmentB=new FragmentB(); FragmentManager manager=getFragmentManager(); FragmentTransaction transaction=manager.beginTransaction(); transaction.replace(R.id.dumper,fragmentB).commit(); } }; 

}

而我的mainActivity类只是添加了RecyclerViewFragment

 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerViewFragment fragment=new RecyclerViewFragment(); FragmentManager manager=getSupportFragmentManager(); FragmentTransaction transaction=manager.beginTransaction(); transaction.add(R.id.dumper,fragment).commit(); } 

}

那么什么是启动fragmentB并将数据从recyclerview Adapter传递给fragmentB的正确方法

Answer 1

谢谢你们的答案，我解决了问题，使用带有String值的接口将适配器连接到包含recyclerview的片段，这里的另一个片段就是我所做的：这是接口

 public interface FragmentCommunication { void respond(int position,String name,String job); 

}

这是适配器

 public class RecyclerAdapter extends RecyclerView.Adapter { private LayoutInflater inflater; private List mList; private FragmentCommunication mCommunicator; public RecyclerAdapter(Context context, List list,FragmentCommunication communication) { inflater = LayoutInflater.from(context); mList = list; mCommunicator=communication; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = inflater.inflate(R.layout.single_row, parent, false); MyViewHolder holder = new MyViewHolder(view,mCommunicator); return holder; } @Override public void onBindViewHolder(final MyViewHolder holder, final int position) { final Information current = mList.get(position); holder.name.setText(current.name); holder.job.setText(current.job); FragmentB fragmentB=new FragmentB(); Bundle bundle=new Bundle(); bundle.putString("NAME",current.name); bundle.putString("JOB",current.job); fragmentB.setArguments(bundle); } @Override public int getItemCount() { return mList.size(); } public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { TextView name; TextView job; FragmentCommunication mComminication; public MyViewHolder(View itemView, FragmentCommunication Communicator) { super(itemView); name = (TextView) itemView.findViewById(R.id.tv_name); job = (TextView) itemView.findViewById(R.id.tv_gob); mComminication=Communicator; name.setOnClickListener(this); } @Override public void onClick(View view) { mComminication.respond(getAdapterPosition(),mList.get(getAdapterPosition()).name,mList.get(getAdapterPosition()).job); } } 

}

包含recyclerview的片段

 public class RecyclerViewFragment extends Fragment { RecyclerView mRecyclerView; RecyclerAdapter mRecyclerAdapter; @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view= inflater.inflate(R.layout.recycler_fragment,container,false); mRecyclerView= (RecyclerView) view.findViewById(R.id.recycler); mRecyclerAdapter=new RecyclerAdapter(getActivity(),getData(),communication); mRecyclerView.setAdapter(mRecyclerAdapter); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); return view; } public static List getData() { Listdata=new ArrayList<>(); String[] names={"ahmed","mohammed"}; String[] jobs={"sacsd","csscs"}; for (int i=0;i 

}

这是片段B，我从适配器获取字符串

 public class FragmentB extends Fragment { TextView textview; TextView textview2; String name; String job; @Override public void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); name=getArguments().getString("NAME"); job=getArguments().getString("JOB"); } @Nullable @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view= inflater.inflate(R.layout.fragment_b,container,false); textview= (TextView) view.findViewById(R.id.getName); textview2= (TextView) view.findViewById(R.id.getJob); textview.setText(name); textview2.setText(job); return view; } 

}

Answer 2

如果我正确理解您的问题，请在适配器中创建侦听器接口或使用常规旧的getter。

Answer 3

您需要通过setArguments（Bundle args）方法将Bundle传递给片段。 由于您尚未设置参数，因此您尝试在Fragment中提取的包将解析为null。

Answer 4

使用Bundle你有正确的想法。 您只需要通过调用setArguments()将其传递给Fragment 。 然后使用getArguments()检索Fragment的Bundle 。

请注意，您可以执行current.name而不是mList.get(position).name 。 同样适合job 。

问题的另一部分是你在两个不同的地方创建FragmentB。 在一个地方你也调用setArguments（）但不显示片段。 在另一个中，您显示片段但不调用setArguments（）。 如果您确实需要从代码的多个部分执行此操作，则应编写一种方法来避免这些不一致。

Answer 5

如果您正在使用kotlin，解决方案要简单得多。 原文答案在这里

传递lamda val itemClick: (Int) -> Unit到你的适配器。

 class MyRecyclerViewAdapter(params , val itemClick: (Int) -> Unit): RecyclerView.Adapter() { internal inner class MyViewHolder(view: View) : RecyclerView.ViewHolder(view) { ... itemView.setOnClickListener( {itemClick(layoutPosition)} ) } } 

在您的片段中使用返回的值position

 val myAdapter = MyRecyclerViewAdapter(params) { position -> // do something }