如何将数据从 Recyclerview 传递到 Fragment [英] How to pass data from Recyclerview to Fragment

问题描述

我在 Fragment 中填充了一个 recyclerView，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一个空值

I have a recyclerView populated in a Fragment and I want to Launch a new Fragment and pass data from the adapter ,I try to use Bundles but it always give a null value this my Adapter Class

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder> {
private LayoutInflater inflater;
private List<Information> mList;
private FragmentCommunication mCommunicator;

public RecyclerAdapter(Context context, List<Information> 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());
    }
}

这是我想要启动的新 Fragment

and this is my new Fragment that I want to launch

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);}

}

}

这就是我如何连接 Fragment 和 recyclerview Adapter带接口

this is how I connect Fragment and recyclerview Adapter with interface

public interface FragmentCommunication {
void respond(int position);

}

这是填充 recyclerview 的 Fragment

and this the Fragment where the recyclerview is populated

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<Information> getData() {
    List<Information>data=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

and my mainActivity class is just add the 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();
}

}

那么启动 fragmentB 并将数据从 recyclerview Adapter 传递到 fragmentB 的正确方法是什么

so what is the right way to launch fragmentB and pass the data from recyclerview Adapter to fragmentB

推荐答案

谢谢你们的回答，我使用带有字符串值的接口将适配器与包含 recyclerview 的片段和此处的另一个片段连接起来解决了这个问题正是我所做的:这是界面

thank you guys for the answer,I solved the problem using an interface with String values to connect the adapter with the fragment that contains the recyclerview and the other fragment here is what I did exactly : this is the interface

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

这是适配器

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder> {
    private LayoutInflater inflater;
    private List<Information> mList;
    private FragmentCommunication mCommunicator;

    public RecyclerAdapter(Context context, List<Information> 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

the fragment that contains the recyclerview

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<Information> getData() {
        List<Information>data=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,String name,String job) {
            FragmentB fragmentB=new FragmentB();
            Bundle bundle=new Bundle();
            bundle.putString("NAME",name);
            bundle.putString("JOB",job);
            fragmentB.setArguments(bundle);
            FragmentManager manager=getFragmentManager();
            FragmentTransaction transaction=manager.beginTransaction();
            transaction.replace(R.id.dumper,fragmentB).commit();
        }

    };

}

this is the fragmentB where I get the Strings from the Adapter

    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;

    }


}

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