java Firebase电子邮件注册，登录和注销

Posted 2021-05-07

private FirebaseAuth mAuth;

mAuth = FirebaseAuth.getInstance();

@Override
public void onStart() {
    super.onStart();
    FirebaseUser currentUser = mAuth.getCurrentUser();
    if (currentUser != null) {
        Intent myIntent = new Intent(MainActivity.this, Main3Activity.class);
        startActivity(myIntent);
        finish();
    }
}


mAuth.createUserWithEmailAndPassword(email.getText().toString(), password.getText().toString())
    .addOnCompleteListener(Main2Activity.this, new OnCompleteListener < AuthResult > () {
        @Override
        public void onComplete(@NonNull Task < AuthResult > task) {
            if (task.isSuccessful()) {
                FirebaseUser user = mAuth.getCurrentUser();
                UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder()
                    .setDisplayName(fname.getText().toString() + " " + lname.getText().toString())
                    .build();
                user.updateProfile(profileUpdates);
                Toast.makeText(Main2Activity.this, "User has been created", Toast.LENGTH_SHORT).show();
                mAuth.signInWithEmailAndPassword(email.getText().toString(), password.getText().toString())
                    .addOnCompleteListener(Main2Activity.this, new OnCompleteListener < AuthResult > () {
                        @Override
                        public void onComplete(@NonNull Task < AuthResult > task) {
                            if (task.isSuccessful()) {
                                Intent myIntent = new Intent(Main2Activity.this, Main3Activity.class);
                                startActivity(myIntent);
                                finish();
                            } else {
                                Toast.makeText(Main2Activity.this, "Authentication failed.", Toast.LENGTH_SHORT).show();
                            }
                        }
                    });
            } else {
                Log.w("demo", "createUserWithEmail:failure", task.getException());
                Toast.makeText(Main2Activity.this, "Authentication failed", Toast.LENGTH_SHORT).show();
            }
        }
    });
    
    //Logout
    
    FirebaseAuth.getInstance().signOut();