Question

我想制作Recycler View，但我也想从数据库向构造函数添加不同的值

这是我的DaftarTugas.java

 package com.example.yehezkiel.eclassapp;

    /**
     * Created by Yehezkiel on 7/12/2018.
     */

    public class DaftarTugas{
        private String judul_tugas;
        private String deskripsi_tugas;
        private String tanggal_kumpul;
        private String tanggal_tugas;
        private String nama_matkul;


        public DaftarTugas(String nama_matkul,String judul_tugas, String deskripsi_tugas, String tanggal_kumpul, String tanggal_tugas) {
            this.nama_matkul = nama_matkul;
            this.judul_tugas = judul_tugas;
            this.deskripsi_tugas = deskripsi_tugas;
            this.tanggal_kumpul = tanggal_kumpul;
            this.tanggal_tugas = tanggal_tugas;
        }

        public DaftarTugas() {

        }


        public String getNama_matkul() {
            return nama_matkul;
        }

        public void setNama_matkul(String nama_matkul) {
            this.nama_matkul = nama_matkul;
        }


        public String getJudul_tugas() {
            return judul_tugas;
        }

        public void setJudul_tugas(String judul_tugas) {
            this.judul_tugas = judul_tugas;
        }

        public String getDeskripsi_tugas() {
            return deskripsi_tugas;
        }

        public void setDeskripsi_tugas(String deskripsi_tugas) {
            this.deskripsi_tugas = deskripsi_tugas;
        }

        public String getTanggal_kumpul() {
            return tanggal_kumpul;
        }

        public void setTanggal_kumpul(String tanggal_kumpul) {
            this.tanggal_kumpul = tanggal_kumpul;
        }

        public String getTanggal_tugas() {

            return tanggal_tugas;
        }

        public void setTanggal_tugas(String tanggal_tugas) {

            this.tanggal_tugas = tanggal_tugas;
        }
    }

这是我来自TwoFragment.Java的代码

    package com.example.yehezkiel.eclassapp;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ProgressBar;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;
import java.util.List;


public class TwoFragment extends Fragment {

    View v;
    private ArrayList<String> key2 = new ArrayList<>();
    private DaftarTugas tugas = new DaftarTugas();
    private ProgressBar mProgressBar4;
    private List<DaftarTugas> listTugas = new ArrayList<>();
    private RecyclerView mRecycleView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener authListener;
    private ArrayList<String> obj2 = new ArrayList<>();

    DatabaseReference userRef = FirebaseDatabase.getInstance().getReference("users");
    FirebaseUser users = FirebaseAuth.getInstance().getCurrentUser();
    DatabaseReference mataKuliahRef = FirebaseDatabase.getInstance().getReference("courses");
    DatabaseReference daftarTugasRef = FirebaseDatabase.getInstance().getReference("tugas");


    public TwoFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

        v =  inflater.inflate(R.layout.fragment_two, container, false);
        mAuth = FirebaseAuth.getInstance();



        //Recycler View
        mRecycleView = (RecyclerView) v.findViewById(R.id.TugasRView);
        mRecycleView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getActivity());
        mRecycleView.setLayoutManager(mLayoutManager);
        mRecycleView.addItemDecoration(new DividerItemDecoration(getActivity(), LinearLayoutManager.VERTICAL));
        mAdapter = new myAdapterTugas(listTugas);
        mRecycleView.setAdapter(mAdapter);



        Bundle bundle = this.getArguments();
        if(getArguments()!=null)
        {
            obj2 = bundle.getStringArrayList("keys");
            Log.e("nba",obj2.toString());
        }



        for(int i = 0;i<obj2.size();i++){
            mataKuliahRef.child(obj2.get(i)).child("name").addValueEventListener(new ValueEventListener() {
                @Override

                public void onDataChange(DataSnapshot dataSnapshot1) {
                    tugas.setName(dataSnapshot1.getValue().toString());
                    listTugas.add(tugas);
                    mAdapter.notifyDataSetChanged();

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

            mataKuliahRef.child(obj2.get(i)).child("tugas").addValueEventListener(new ValueEventListener() {

                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    listTugas.clear();
                    if (dataSnapshot.exists()) {
                        for (DataSnapshot dataHasil : dataSnapshot.getChildren()) {
                            final String idTugas = dataHasil.getKey();

                            Log.e("Yhz2", idTugas);

                            daftarTugasRef.child(idTugas).addListenerForSingleValueEvent(new ValueEventListener() {
                                @Override
                                public void onDataChange(DataSnapshot dataSnapshot2) {
                                    tugas = dataSnapshot2.getValue(DaftarTugas.class);
                                    listTugas.add(tugas);
                                    mAdapter.notifyDataSetChanged();
                                }

                                @Override
                                public void onCancelled(DatabaseError databaseError) {

                                }
                            });

                        }

                }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
        }


        return v;
    }
}

我只想为DaftarTugas添加名称，daftar tugas的名称为deskripsi_tugas，judul_tugas，tanggal_kumpul，tanggal_tugas。已经有deskripsi_tugas，judul_tugas，tanggal_kumpul，tanggal_tugas做得很好。因此，我想向该java类再添加1个，这是另一个数据库中的名称

mataKuliahRef.child(obj2.get(i)).child("name").addValueEventListener(new ValueEventListener() {
                @Override

                public void onDataChange(DataSnapshot dataSnapshot1) {
                    tugas.setName(dataSnapshot1.getValue().toString());
                    listTugas.add(tugas);
                    mAdapter.notifyDataSetChanged();

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

注意： 1. obj2包含另一个片段的密钥，该片段是我发送给TwoFragment

的

Here the firebase structrure

如何为Recycler View添加单独的值？

0 个答案: