Question

我正在使用带有片段的recyclerview。以下代码段从Firebase检索数据。我还在recyclerview适配器中实现了onClickListener（），并希望启动一个意图并显示详细的配置文件视图。（onClickListener正在运行，因为我可以获取日志消息）。

但是如何使用intent.putExtra（）传递子键或项ID，以便可以启动新活动并使用该子键或ID填充数据？

Firebase structure

片段

dd$id <- cumsum(dd$day_after_rainfall==1)

print(dd)
#         date day_after_rainfall id
# 1 2018-03-04                  1  1
# 2 2018-03-05                  2  1
# 3 2018-03-06                  3  1
# 4 2018-03-07                  4  1
# 5 2018-03-09                  1  2
# 6 2018-03-11                  1  3
# 7 2018-03-15                  1  4
# 8 2018-03-16                  2  4
# 9 2018-03-17                  3  4

医生班

public class DoctorsFragment extends Fragment {

private List<Doctors> list;
private DoctorsAdapter adapter;
private DatabaseReference databaseReference;
private ValueEventListener valueEventListener;

private SearchView searchView = null;
private SearchView.OnQueryTextListener queryTextListener;

/**
 * Use this factory method to create a new instance of
 * this fragment using the provided parameters.
 * @return A new instance of fragment DoctorsFragment.
 */
// TODO: Rename and change types and number of parameters
public static DoctorsFragment newInstance() {
   return new DoctorsFragment();
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
    getActivity().setTitle(R.string.nav_menu_doctors);

}

@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.blank_fragment, container, false);
    databaseReference = FirebaseDatabase.getInstance().getReference();

    list = new ArrayList<>();

    RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);

    adapter = new DoctorsAdapter(getContext(), list);
    RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getContext(), 2);
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addItemDecoration(new GridSpacingItemDecoration(2, dpToPixel(10), true));
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.setAdapter(adapter);
    adapter.setmOnItemClickListener(onItemClickListener);
    asynctask();

    return view;
}
private void asynctask() {
    databaseReference = databaseReference.child("doctors");

    valueEventListener = new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
                String name = snapshot.child("name").getValue(String.class);
                String specialty = snapshot.child("specialty").getValue(String.class);
                String thumbnail = snapshot.child("thumbnail").getValue(String.class);
                Doctors doctor = new Doctors(name, specialty,thumbnail);
                list.add(doctor);
                adapter.notifyDataSetChanged();
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {}
    };
    databaseReference.addListenerForSingleValueEvent(valueEventListener);
}

private View.OnClickListener onItemClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        RecyclerView.ViewHolder viewHolder = (RecyclerView.ViewHolder) view.getTag();
        int position = viewHolder.getAdapterPosition();
        Doctors doctor = list.get(position);
        Intent intent = new Intent(getActivity(), DoctorProfile.class);

    }
  };
}

适配器

public class Doctors {


private String name;
private String degree;
private String departments;
private String bio;
private String email;
private String specialty;
private String thumbnail;

public Doctors(){} // no-argument constructor

public Doctors(String name, String departments, String bio, String degree, String specialty, String thumbnail, String email) {
    this.name = name;
    this.departments = departments;
    this.bio = bio;
    this.degree = degree;
    this.email = email;
    this.specialty = specialty;
    this.thumbnail = thumbnail;
}

public Doctors(String name, String specialty, String thumbnail) {
    this.name = name;
    this.specialty = specialty;
    this.thumbnail = thumbnail;
}

public String getName() {
    return name;
}
public String getSpecialty() {
    return specialty;
}
public String getThumbnail() {
    return thumbnail;
}

public String getDegree() {
    return degree;
}

public String getDepartments() {
    return departments;
}

public String getBio() {
    return bio;
}

public String getEmail() {
    return email;
}
}

Answer 1

在您的Doctor POJO中再添加一个属性，这就是ID

public class Doctors {

private String id;
private String name;
private String degree;
...

并更新您的构造函数（还将id的setter和getter放置进去）

public Doctors(String id,String name, String specialty, String thumbnail) {
    this.name = name;
    this.specialty = specialty;
    this.thumbnail = thumbnail;
    this.id = id;
}

现在，当您获取数据时，获取检索到的数据的密钥，这就是您的医生身份

valueEventListener = new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot snapshot: dataSnapshot.getChildren()) {
                String name = snapshot.child("name").getValue(String.class);
                String specialty = snapshot.child("specialty").getValue(String.class);
                String thumbnail = snapshot.child("thumbnail").getValue(String.class);
                String id = snapshot.getKey();
                Doctors doctor = new Doctors(id,name, specialty,thumbnail);
                list.add(doctor);
                adapter.notifyDataSetChanged();
            }
        }

然后在您的onClickListener()中传递您意图中多余的ID

private View.OnClickListener onItemClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        RecyclerView.ViewHolder viewHolder = (RecyclerView.ViewHolder) view.getTag();
        int position = viewHolder.getAdapterPosition();
        Doctors doctor = list.get(position);
        Intent intent = new Intent(getActivity(), DoctorProfile.class);
        intent.putExtra("id",doctor.getID();
        startActivity(intent);

    }
  };

如何获取Firebase列表对象的位置？

1 个答案: