How do I sign out users in Firebase 3.0?

Question

According to documentation, I force a user to sign out with the method signOut().

This is what I have tried:

var rootRef = firebase.database         


        

Answer 1

There have several way to sign out user:

1. FirebaseUI: Refarence

Add depenencies:

dependencies {
    implementation 'com.firebaseui:firebase-ui-auth:4.0.0'
}

Then:

public void onClick(View v) {
if (v.getId() == R.id.sign_out) {
    AuthUI.getInstance()
        .signOut(this)
        .addOnCompleteListener(new OnCompleteListener() {
            public void onComplete(@NonNull Task task) {
                // user is now signed out
                startActivity(new Intent(MyActivity.this, SignInActivity.class));
                finish();
            }
        });
    }
}

---

2. Kotlin: Referance

Use Android default Authentication dependency, ex: com.google.firebase:firebase-auth:16.0.1

firebase.auth().signOut().then(function() {
  // Sign-out successful.
}).catch(function(error) {
  // An error happened.
});

---

3. Default with java:

Use Android default Authentication dependency, ex: com.google.firebase:firebase-auth:16.0.1

FirebaseUser user = mAuth.getCurrentUser();
if (user != null){
    mAuth.signOut();
    Toast.makeText(this, user.getEmail()+ " Sign out!", Toast.LENGTH_SHORT).show();
}else{
    Toast.makeText(this, "You aren't login Yet!", Toast.LENGTH_SHORT).show();
}