我想知道如何在对象内部执行实时搜索。
下面有JSON代码。因此，我想这样做：我想在对象-M11-OIIHbKTVqCJ-Swv内部执行实时搜索。如果我在搜索字段中输入以下单词：Abilify数据库将给我结果（我是说它将把数据发送给我）。
JSON代码：
"Places" : {
"-M11-OIIHbKTVqCJ-Swv" : {
"name" : "Farmacia Pagani Dr. Roberto",
"others" : {
"Abilify" : 100,
"Acetaminophen" : 120,
"Acyclovir" : 140,
"Adderall" : 160
}
},
"-M11-OJJCGAPdJUknLXX" : {
"name" : "FARMACIA DR. TUMIATTI MARIANO",
"others" : {
"Abilify" : 100,
"Acetaminophen" : 120,
"Acyclovir" : 140,
"Adderall" : 160
}
}
如果我的名字是：Farmacia Pagani Roberto Dr. Roberto，我想检索M11-OIIHbKTVqCJ-Swv“
我写的代码：
package com.example.ipill;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.FirebaseError;
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.Query;
import com.google.firebase.database.ValueEventListener;
public class FirebaseSearch extends AppCompatActivity {
private EditText mSearchField;
private ImageButton mSearchBtn;
private ImageButton AddToCart;
private Button Cart;
private String nameOfThePharmacy;
private String keyNameOfFarmacy;
String searchText="";
private RecyclerView mResultList;
private DatabaseReference mUserDatabase;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_firebasesearch);
Intent intent = getIntent();
nameOfThePharmacy = intent.getStringExtra("Name");
System.out.println("This is the name of the pharmacy that you have clicked on"+nameOfThePharmacy);
mUserDatabase = FirebaseDatabase.getInstance().getReference("Places");
mSearchField = findViewById(R.id.search_field);
mSearchBtn = findViewById(R.id.search_btn);
mResultList = findViewById(R.id.result_list_cart);
AddToCart = findViewById(R.id.imageButton2);
Cart = findViewById(R.id.GoToCart);
mResultList.setHasFixedSize(true);
mResultList.setLayoutManager(new LinearLayoutManager(this));
Query query = mUserDatabase.orderByChild("name").equalTo(nameOfThePharmacy);
query.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot studentSnapshot: dataSnapshot.getChildren()) {
keyNameOfFarmacy=studentSnapshot.getKey();
}
mUserDatabase.child(keyNameOfFarmacy).child("others").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
try {
if (snapshot.getValue() != null) {
try {
System.out.println("This are the medicines of that specific pharmacy" + snapshot.getValue()); // your name values you will get here
} catch (Exception e) {
e.printStackTrace();
}
} else {
Log.e("TAG", " it's null.");
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
throw databaseError.toException();
}
});
}
@Override
public void onCancelled(DatabaseError databaseError) {
throw databaseError.toException();
}
});
mSearchBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
searchText = mSearchField.getText().toString();
firebaseUserSearch(searchText);
}
});
Cart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent itent = new Intent(FirebaseSearch.this, CartActivity.class);
startActivity(itent);
}
});
}
private void firebaseUserSearch(String searchText) {
Toast.makeText(FirebaseSearch.this, "Started Search", Toast.LENGTH_LONG).show();
Query firebaseSearchQuery = mUserDatabase.orderByChild("name").startAt(searchText).endAt(searchText + "\uf8ff");
FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
Users.class,
R.layout.list_layout,
UsersViewHolder.class,
firebaseSearchQuery
) {
@Override
protected void populateViewHolder(UsersViewHolder viewHolder, Users model, int position) {
viewHolder.getDetails(model.getName(), model.getSurname(),model.getPrice());
viewHolder.setDetails(model.getName(), model.getSurname(),model.getPrice());
}
};
mResultList.setAdapter(firebaseRecyclerAdapter);
}
@Override
protected void onStart() {
super.onStart();
invalidateOptionsMenu();
}
// View Holder Class
public static class UsersViewHolder extends RecyclerView.ViewHolder {
View mView;
String Name;
String Surname;
Long Price;
public UsersViewHolder(View itemView) {
super(itemView);
mView = itemView;
ImageButton addToCart = (ImageButton)mView.findViewById(R.id.imageButton2);
addToCart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("Cart");
myRef.push().setValue(new Users(Name,Surname,Price));
}
});
}
public void getDetails(String name,String cognome,Long price){
Name=name;
Surname=cognome;
Price=price;
}
public void setDetails(String Name, String Surname, Long Price) {
TextView user_name = (TextView) mView.findViewById(R.id.name_text);
TextView user_surname = (TextView)mView.findViewById(R.id.status_text);
TextView user_price = (TextView)mView.findViewById(R.id.price);
user_name.setText(Name);
user_surname.setText(Surname);
user_price.setText(Long.toString(Price));
}
}
}
问题在于它返回：E / TAG：它为空。
我不了解如何在特定对象内执行实时搜索。我知道如何使用整个数据集执行实时搜索，但暂时没有帮助。