Android中Firebase Auth非角色认证下按邮箱跳转页面问题求助

Got it, let's fix this issue step by step. The root problem here is that your current login flow isn't properly checking the logged-in user's email to redirect them to the correct activity. Below is a complete, implementation-ready solution that meets your requirements:

Core Logic Overview #

1. Validate user input (email/password)
2. Verify if the user is registered by attempting a login
3. On successful login, check if the user's email matches the admin address (admin@admin.com)
4. Redirect to AdminActivity if it's the admin email, otherwise redirect to ProfileActivity

Complete Code Example (Android with Firebase Auth) #

Assuming you're using Firebase Authentication (adjust logic for your backend if needed), here's how to implement this in your LoginActivity:

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

public class LoginActivity extends AppCompatActivity {

    private FirebaseAuth mAuth;

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

        mAuth = FirebaseAuth.getInstance();
        EditText emailInput = findViewById(R.id.et_email);
        EditText passwordInput = findViewById(R.id.et_password);
        Button loginButton = findViewById(R.id.btn_login);

        loginButton.setOnClickListener(v -> {
            String email = emailInput.getText().toString().trim();
            String password = passwordInput.getText().toString().trim();

            // Basic input validation
            if (TextUtils.isEmpty(email)) {
                emailInput.setError("Email is required");
                return;
            }
            if (TextUtils.isEmpty(password)) {
                passwordInput.setError("Password is required");
                return;
            }

            // Attempt login to verify if user is registered
            mAuth.signInWithEmailAndPassword(email, password)
                    .addOnCompleteListener(this, task -> {
                        if (task.isSuccessful()) {
                            // Login success: Fetch current user's email
                            FirebaseUser user = mAuth.getCurrentUser();
                            if (user != null && user.getEmail() != null) {
                                String userEmail = user.getEmail();
                                // Check if it's the admin email (case-insensitive match)
                                if ("admin@admin.com".equalsIgnoreCase(userEmail)) {
                                    // Redirect to Admin Activity
                                    startActivity(new Intent(LoginActivity.this, AdminActivity.class));
                                } else {
                                    // Redirect to Profile Activity
                                    startActivity(new Intent(LoginActivity.this, ProfileActivity.class));
                                }
                                // Close login activity to prevent going back
                                finish();
                            }
                        } else {
                            // Login failed: User is not registered or password is wrong
                            Toast.makeText(LoginActivity.this, "Invalid credentials or user not registered",
                                    Toast.LENGTH_SHORT).show();
                        }
                    });
        });
    }
}

Key Notes to Avoid Issues #

• Activity Registration: Ensure both AdminActivity and ProfileActivity are added to your AndroidManifest.xml (otherwise the app will crash on redirect).
• Case Insensitivity: Using equalsIgnoreCase() allows case variations (e.g., Admin@Admin.com) to still redirect to the admin page—remove this if you need an exact case match.
• Finish Login Activity: Calling finish() after redirecting ensures users can't press the back button to return to the login screen after successful authentication.
• Non-Firebase Backends: If you're using a custom backend, the logic stays the same:
  1. Call your login API with email/password
  2. On success, retrieve the user's email from the API response
  3. Compare the email to the admin address and redirect accordingly

Troubleshooting Your Original Issue #

If you were previously being redirected to ProfileActivity even with the admin email, check these common mistakes:

• You had the redirect logic reversed (e.g., checking for non-admin first)
• Typo in the admin email string (e.g., admin@admin.cm instead of .com)
• You didn't properly fetch the logged-in user's email (e.g., using a hardcoded value instead of user.getEmail())

内容的提问来源于stack exchange，提问作者JimC