클래스의 모든 노드 값을 저장하려고하지만 클래스에 저장하지 않는 것 같습니다. readDataListener()에서 가능한 수정을 알아낼 수 없습니다. 보시다시피 클래스의 모든 노드 값을 저장하려고하지만 잘못된 점을 알지 못합니다.Firebase 데이터 검색 오류
SymptomActivity.java
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
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 SymptomActivity extends AppCompatActivity {
private DatabaseReference mFirebaseDatabase;
private FirebaseDatabase mFirebaseInstance;
Button button;
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_symptom);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
button = (Button) findViewById(R.id.button8);
textView = (TextView) findViewById(R.id.textView2);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
FirebaseDatabase.getInstance().setPersistenceEnabled(true);
// Write a message to the database
mFirebaseInstance = FirebaseDatabase.getInstance();
// store app title to 'app_title' node
mFirebaseInstance.getReference("app_title").setValue("microDoctor");
mFirebaseDatabase = mFirebaseInstance.getReference("symptomList");
//mFirebaseDatabase.child("Headache").child("Some Value").setValue("Head");
//mFirebaseDatabase.setValue("Headache");
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
readDataListener();
}
});
}
private void readDataListener() {
mFirebaseDatabase.child("Abdominal Cramps").child("Diarrhea").child("Vomiting").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Symptom symptom = dataSnapshot.getValue(Symptom.class);
// Check for null
if (symptom == null) {
Log.e("Data", "Symptom data is null!");
return;
}
Log.e("Symptom Data", "User data is changed!"+symptom.symptom1);
// Display newly updated name and email
textView.setText(symptom.disease);
}
@Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.e("Error", "Failed to read user", error.toException());
}
});
}}
Symptom.java 공용 클래스 증상 {
public String symptom1;
public String symptom2;
public String symptom3;
public String disease;
// Default constructor required for calls to
// DataSnapshot.getValue(User.class)
public Symptom(){
}
public Symptom(String symptom1, String symptom2, String symptom3, String disease){
this.symptom1 = symptom1;
this.symptom2 = symptom2;
this.symptom3 = symptom3;
this.disease = disease;
}
}
는
데이터에 액세스하려고
일부 코드가 변경되었습니다. 또한 이제는 액세스 할 수 있지만 이제는 노드의 모든 값을 클래스에 저장하는 작업을 수행합니다. –