单击列表视图时如何在下一个活动中检索Firebase

Question

当在recordCust活动（如下）中单击listview时，数据应显示在Parcel_DM活动（以上）中。问题是我不知道如何检索火力数据回来时，单击列表视图。当我单击列表视图时，数据不会显示。

您的帮助将非常感激，非常感谢你。

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

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;


public class Parcel_DM extends AppCompatActivity {

    //    Button Track;
    TextView textView1;
    ListView listViewDM;
    DatabaseReference table_dm;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.parcel_dm);
        // Track = (Button) findViewById(R.id.btn_track);
        textView1 = (TextView) findViewById(R.id.parcelView);
        listViewDM = (ListView) findViewById(R.id.listViewDeliveryMan);
        table_dm = FirebaseDatabase.getInstance().getReference("DeliveryMan");
    }


        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        String postSnapshot = parent.getItemAtPosition(position).toString();

        table_dm.addValueEventListener(new ValueEventListener() {

                       @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                             if(postSnapshot.getKey() != null) {

                                 //DeliveryMan stall = postSnapshot.getValue(DeliveryMan.class);
                                // String key = stall.getPhone();

                                 textView1 = (TextView) findViewById(R.id.parcelView);

                                       textView1.append("Name:" + postSnapshot.child("name").getValue().toString() + "\n");
                                       textView1.append("Phone:" + postSnapshot.child("phone").getValue().toString() + "\n");
                                       textView1.append("Address:" + postSnapshot.child("adress").getValue().toString() + "\n");
                                       textView1.append("Postcode:" + postSnapshot.child("postcode").getValue().toString() + "\n");


                               
                                 Intent homeIntent = getIntent();
                                 if (homeIntent.hasExtra("DeliveryMan")) {
                                     textView1.setText(homeIntent.getStringExtra("DeliveryMan"));
                                 }
                             }
                        }
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });



         }
}
**

**


 listViewDM.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
                table_dm.addValueEventListener(new ValueEventListener(){
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                            if(postSnapshot.getKey() != null) {

                                textView1 = (TextView) findViewById(R.id.parcelView);

                                DeliveryMan stall = postSnapshot.getValue(DeliveryMan.class);
                                DeliveryMan deliveryMan = deliveryman.get(position);
                                String key = deliveryMan.getPhone();
                                deliveryman.add(stall);

                                Intent homeIntent = new Intent(RecordCust.this, Parcel_DM.class);
                                homeIntent.putExtra("position", position);
                                startActivity(homeIntent);
                                finish();
                            }
                        }
                        listViewDM.setAdapter(artistAdapter);
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });


            }
        });
    }