How to make a user sign out in Firebase?

Question

I am making a simple authentication app in Android using Firebase authentication. Till now I am successful in signing the user in, however the issue is that the user remains signed in, and I can't find a way to sign him out.

Here is my MainActivity.java code

public class MainActivity extends AppCompatActivity {

    private FirebaseAuth mAuth;
    private FirebaseAuth.AuthStateListener mAuthListener;

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

        //tracking the sign in and singn out operations
        mAuth = FirebaseAuth.getInstance();
        mAuthListener = new FirebaseAuth.AuthStateListener(){
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user!=null){
                    System.out.println("User logged in");
                }
                else{
                    System.out.println("User not logged in");
                }
            }
        };
    }


    public void onStart(){
        super.onStart();
        mAuth.addAuthStateListener(mAuthListener);
    }
    public void onStop(){
        super.onStop();
        if (mAuthListener != null) {
            mAuth.removeAuthStateListener(mAuthListener);

        }
    }


    public void buttonClicked(View view){

        EditText editemail = (EditText) findViewById(R.id.email);
        EditText editpass = (EditText) findViewById(R.id.password);

        String email = editemail.getText().toString();
        String password = editpass.getText().toString();


        mAuth.signInWithEmailAndPassword(email, password)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                     //   Log.d(TAG, "signInWithEmail:onComplete:" + task.isSuccessful());
                        Toast.makeText(MainActivity.this, "Authentication Success.",
                                Toast.LENGTH_SHORT).show();
                        startActivity(new Intent(MainActivity.this,Success.class));
                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                           // Log.w(TAG, "signInWithEmail", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }

                        // ...
                    }
                });
    }



}

Answer 1

Use this code FirebaseAuth.getInstance().signOut();