https://i.stack.imgur.com/HHuaO.png

I wonder if there's any way where when I try to retrieve the specific email, I get the other child value which is the id. For example, I retrieve the [email protected], I get the id in the database for return. Whenever i tried to access the id, it says cannot resolve symbol id. Intent doesnt work if i put it inside the if()

public class loginActivity extends AppCompatActivity {
CheckBox checkbox;
EditText email;
EditText password;
FirebaseAuth mAuth;
String emailText;
String passwordText;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    checkbox = findViewById(R.id.checkbox);
    email = findViewById(R.id.email);
    password = findViewById(R.id.password);
}

public void confirm(View view) {
    checkAccount();
}

private void checkAccount() {
    emailText = email.getText().toString();
    passwordText = password.getText().toString();
    mAuth = FirebaseAuth.getInstance();

    checkBox();

    mAuth.signInWithEmailAndPassword(emailText, passwordText).addOnCompleteListener(task -> {
        if (task.isSuccessful()) {
            if (!checkbox.isChecked()) {
                Toast.makeText(loginActivity.this, "Account signin successful", Toast.LENGTH_SHORT).show();
                goToMain(new DataRetriever() {
                    @Override
                    public void onIdFound(String id) {
                        Intent toMain = new Intent(loginActivity.this, MainActivity.class);
                        toMain.putExtra("welcomeId", id);
                        startActivity(toMain);

                    }
                });
            }
        } else {
            Toast.makeText(loginActivity.this, "Account signin failed: "   task.getException().getMessage(), Toast.LENGTH_SHORT).show();
        }
    });
}

public void goToMain(DataRetriever retriever) {

    DatabaseReference dbRef = FirebaseDatabase.getInstance().getReference();

    dbRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            for (DataSnapshot snapshot1: snapshot.getChildren()){
                String email = String.valueOf(snapshot1.child("email").getValue());
                if (email.equals(emailText)){
                    String id = String.valueOf(snapshot1.child("id").getValue());
                    retriever.onIdFound(id);
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

}
public interface DataRetriever{
    void onIdFound(String id);
}


public void checkBox() {
    if (checkbox.isChecked()) {
        SharedPreferences sharedPreferences = getSharedPreferences("remember", MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString("remember", "true");
        editor.apply();

        Intent toMain = new Intent(loginActivity.this, introActivity.class);
        startActivity(toMain);
    }
}

}

CodePudding user response：

You mean that you want to get the other childs instead of the current you have, yes it is possible

DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
reference.child("users").addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for(DataSnapshot snapshot:dataSnapshot.getChildren()){
                String email= snapshot.child("email").getValue(String.class);//get email
                //Check if email is the not same
                  if(!email.Equals(EditTextValue){
                   //other value id
                   String id= snapshot.child("id").getValue(String.class);
                  }
            }
        }

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

        }
    });

CodePudding user response：

Add this interface

public interface DataRetriever{
    void onIdFound(String id);
}

Replace your gotoMain with this

public void goToMain(DataRetriever retriever ) {

    DatabaseReference dbRef = FirebaseDatabase.getInstance().getReference().child("users");

    dbRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            for (DataSnapshot snapshot1: snapshot.getChildren()){
                String email = String.valueOf(snapshot1.child("email").getValue());
                if (email.equals(emailText)){
                    String id = String.valueOf(snapshot1.child("id").getValue());
                    retriever.onIdFound(id);
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });

Call gotoMain like below:

 goToMain(new DataRetriever() {
        @Override
        public void onIdFound(String id) {
            //do whatever you want to do with id
        }
    });