将数据从适配器发送到下一个片段

Question

如何将数据从适配器发送到fragmnet。

我在这里使用Recyclerview显示我的联系人列表，所以这是适配器代码

RecyclerView适配器代码：

public class contactAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
ArrayList<contactModel> getdetails =new ArrayList<contactModel>(  );
Context con;
LayoutInflater layoutInflater;
Sendcontact sendcontact;

public contactAdapter(Context context, ArrayList<contactModel> getdetails) {
    this.con = context;
    this.getdetails = getdetails;
    layoutInflater = LayoutInflater.from( con);
}


@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = layoutInflater.inflate( R.layout.contactlist, viewGroup, false );
    contactLayout layout = new contactLayout(view );
    return layout;
}

@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
    contactLayout layout = (contactLayout) viewHolder;
    final contactModel details = getdetails.get( i );
    layout.contactname.setText( "  "+details.getContactname() );
    layout.contactnum.setText( "  "+details.getContactnumber() );
    layout.favcheck.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if(isChecked == true){
                String status = "true";
                String id = details.contactid;
                String favname = details.contactname;
                String favnum = details.contactnumber;
                sendcontact.OnItemclicked(id);

            }else{
                String status = "false";
                String id = details.contactid;
                String favname = details.contactname;
                String favnum = details.contactnumber;
            }
        }
    } );


}

@Override
public int getItemCount() {
    return getdetails.size();
}

 public interface Sendcontact{
    void OnItemclicked(String id);
}

private class contactLayout extends RecyclerView.ViewHolder{
    TextView contactname, contactnum;
    CheckBox favcheck;
    public contactLayout(View view) {
        super(view);
        contactname = (TextView) view.findViewById( R.id.name );
        contactnum = (TextView) view.findViewById( R.id.phonenumber );
        favcheck = (CheckBox) view.findViewById( R.id.favcheck );
    }
}

}

这是我的第一个片段视图。因此，每当我选中复选框时，数据都应发送到下一个片段。

这是我下一个片段中的代码

最喜欢的片段类：

public class Favorite extends Fragment {
public Favorite() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view= inflater.inflate( R.layout.fragment_favorite, container, false );
    return view;
}
contactAdapter.Sendcontact sendcontact = new contactAdapter.Sendcontact() {
    @Override
    public void OnItemclicked(String id) {
        Log.e( TAG, id  );
    }
};

}

Answer 1

添加到适配器回调界面：

private OnItemClickListener listener;

    public interface OnItemClickListener {
        void onItemChecked(ContactModel model);
    }

    public void setOnItemClickListener(OnItemClickListener listener){
        this.listener = listener;
    }

并使用该侦听器：

    layout.favcheck.setOnCheckedChangeListener( new 
         CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if(listener != null)
            listener.onItemChecked(details)
    }
} );

有两种方法：

在第二个片段中实现此侦听器：

public class Contacts extends Fragment implements contactAdapter.OnItemClickListener{

    ...

    //assign listener to instance of adapter here

    // use
    @Override
    onItemChecked(ContactModel model){
    //send data to second fragment here
    }

    ...

}

在第一个片段中实现此侦听器：

public class Contacts extends Fragment implements contactAdapter.OnItemClickListener{

    ...

    adapter.setOnItemClickListener(this)

    @Override
    onItemChecked(ContactModel model){
    //send data to second fragment here
    }

    ...

}

Answer 2

1。制作一个监听器类

public interface MyOnItemClickListener {
    void onItemClick(View v, int position);
}

2。在要发送更新的片段中创建侦听器的对象

public class Favorite extends Fragment {


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    .
    .
    MyOnItemClickListener myOnItemClickListener=new MyOnItemClickListener() {
    @Override
    public void onItemClick(View v, int position) {

        selected_validity=position;
        //do whatever you want here

       }
    };
    contactAdapter ContactAdapter = new contactAdapter(your_list,this,myOnItemClickListener);
    yourRecyclerview.setAdapter(ContactAdapter);

}

}

3。按如下所示更改适配器：

public class contactAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
MyOnItemClickListener listener;
ArrayList<contactModel> getdetails =new ArrayList<contactModel>(  );
Context con;
LayoutInflater layoutInflater;

public contactAdapter(ArrayList<contactModel> getdetails, Context context,MyOnItemClickListener listener ) {
    this.con = context;
    this.getdetails = getdetails;
    layoutInflater = LayoutInflater.from( con);
    this.listener = listener;
}


private class contactLayout extends RecyclerView.ViewHolder{
    TextView contactname, contactnum;
    CheckBox favcheck;
    public contactLayout(View view) {
        super(view);
        contactname = (TextView) view.findViewById( R.id.name );
        contactnum = (TextView) view.findViewById( R.id.phonenumber );
        favcheck = (CheckBox) view.findViewById( R.id.favcheck );
    }
        @Override
        public void onClick(View v) {
            if (mItemClickListener != null) {


                Toast.makeText(context,"pos: "+getLayoutPosition(),Toast.LENGTH_SHORT).show();
                mItemClickListener.onItemClick(v, getLayoutPosition());
                notifyDataSetChanged();

            }


        }
    }
}