如何从 Firebase 数据库中获取密码并与 edittext 匹配？

Question

I am new in android studio and java as well

I created on firebasedatabase codes and I want to code it as shown below

Class aclass {
String codeX= someedittext.toString();
String codeY= coderetrievedfromfirebase.toString();
if (codex=codey){do something};
}

Thanks in advance

Answer 1

You may use FirebaseAuth to authenticate your email and password by using below code:-

private FirebaseAuth mAuth = FirebaseAuth.getInstance();

 mAuth.signInWithEmailAndPassword(email, password)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        // Sign in success, update UI with the signed-in user's information
                        Log.d(TAG, "signInWithEmail:success");
                        FirebaseUser user = mAuth.getCurrentUser();
                        updateUI(user);
                    } else {
                        // If sign in fails, display a message to the user.
                        Log.w(TAG, "signInWithEmail:failure", task.getException());
                        Toast.makeText(EmailPasswordActivity.this, "Authentication failed.",
                                Toast.LENGTH_SHORT).show();
                        updateUI(null);
                    }

                    // ...
                }
            });

updateUI:

private void updateUI(FirebaseUser user){
if (user != null) {
    // Name, email address, and profile photo Url
    String name = user.getDisplayName();
    String email = user.getEmail();
    Uri photoUrl = user.getPhotoUrl();

    // Check if user's email is verified
    boolean emailVerified = user.isEmailVerified();

    // The user's ID, unique to the Firebase project. Do NOT use this value to
    // authenticate with your backend server, if you have one. Use
    // FirebaseUser.getIdToken() instead.
    String uid = user.getUid();
}
}

For more information you may go through Google Firebase Authentication