Question

这是我的recyclerview课，其中有电工，水管工，焊工等作为我的recyclerview项。我希望每当用户单击这些项目中的任何一项时，从Firebase检索的相应数据都应在下一个活动中显示。

package com.example.hp.dc_project;

import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.CardView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

/** * Created by HP on 20-07-2018. */
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MyViewHolder> {
    private Context mContext;
    private List<category> mdata;

    public RecyclerViewAdapter(Context context, List<category> mdata) {
        this.mContext = context;
        this.mdata = mdata;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater mInflater = LayoutInflater.from(mContext);
        View view = mInflater.inflate(R.layout.cardview_category,parent,false);
        return new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        holder.tv.setText(mdata.get(position).getName());
        holder.iv.setImageResource(mdata.get(position).getThumnail());
        holder.cardView.setOnClickListener(new View.OnClickListener() {  
            @Override
            public void onClick(View v) {
                Intent i = new Intent(mContext.getApplicationContext(),available_worker.class);
                mContext.startActivity(i);
            }
        });
    }

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

    public static class MyViewHolder extends RecyclerView.ViewHolder {
        TextView tv;
        ImageView iv;
        CardView cardView;

        public MyViewHolder(View itemView) {
            super(itemView);
            tv = (TextView)itemView.findViewById(R.id.tv_category);
            iv = (ImageView)itemView.findViewById(R.id.iv_category);
            cardView = (CardView)itemView.findViewById(R.id.cardview);
        }
    }
}

这是活动类，我要在其中显示包含在单击recyclerview项目后从firebase检索到的数据的列表视图：

package com.example.hp.dc_project;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

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;

public class available_worker extends AppCompatActivity {
    private ListView lv;
    private FirebaseDatabase database;
    private ArrayList<String>list;
    private ArrayAdapter<String>adapter;
    private Electrician elec;
    //  adapter = new ArrayAdapter<Electrician>(this,R.layout.list_of_work    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_available_worker);
        lv = (ListView)findViewById(R.id.listView_workeravailable);
        elec = new Electrician();
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?>parent, View view, int position, long id) {
                Intent i = new Intent(available_worker.this,WorkerProfile.class);
                startActivity(i);
            }
        });
        list = new ArrayList<>();
        adapter = new ArrayAdapter<String>(this, R.layout.list_of_worker,R.id.employeeadd);
        database = FirebaseDatabase.getInstance();
        DatabaseReference rootref = database.getReference();
        DatabaseReference electricianref = rootref.child("Employee").child("Electrician");
        electricianref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot ds : dataSnapshot.getChildren()) {
                    String fName = ds.child("Fname").getValue(String.class);
                    String lName = ds.child("Lname").getValue(String.class);
                    String address = ds.child("Address").getValue(String.class);
                    list.add(fName);
                    list.add(lName);
                    list.add(address);
                }
             }

             @Override
             public void onCancelled(@NonNull DatabaseError databaseError) {
             }
        });
    }
}

Answer 1

在单击时，获取您的工作人员id并放入extra，在下一个活动中放置value事件列表器并获取相应的数据，但是您有一件事是您必须具有id或可以唯一标识引用的对象火力基地。

holder.cardView.setOnClickListener(new View.OnClickListener() {  
                @Override
                public void onClick(View v) {
                    Intent i = new Intent(mContext.getApplicationContext(),available_worker.class);
                    i.putExtra("uid",workerid);
                    mContext.startActivity(i);
                }
            });

在下一个活动中

String s = getIntent().getStringExtra("uid");
firebaseref.child(s).addvalueEventListner(////) {//pupulate your list view}

当我在recyclerview中单击项目时，如何从Firebase检索数据并将其显示在下一个活动的列表视图中？

1 个答案: