AnonymousAuthActivity.java

/**
 * Copyright 2021 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.firebase.quickstart.auth;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.EmailAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

/**
 * Activity to demonstrate anonymous login and account linking (with an email/password account).
 */
public class AnonymousAuthActivity extends Activity {

    private static final String TAG = "AnonymousAuth";

    // [START declare_auth]
    private FirebaseAuth mAuth;
    // [END declare_auth]

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // [START initialize_auth]
        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();
        // [END initialize_auth]
    }

    // [START on_start_check_user]
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }
    // [END on_start_check_user]

    private void signInAnonymously() {
        // [START signin_anonymously]
        mAuth.signInAnonymously()
                .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, "signInAnonymously:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI(user);
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInAnonymously:failure", task.getException());
                            Toast.makeText(AnonymousAuthActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }
                    }
                });
        // [END signin_anonymously]
    }

    private void linkAccount() {
        AuthCredential credential = EmailAuthProvider.getCredential("", "");

        // [START link_credential]
        mAuth.getCurrentUser().linkWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.d(TAG, "linkWithCredential:success");
                            FirebaseUser user = task.getResult().getUser();
                            updateUI(user);
                        } else {
                            Log.w(TAG, "linkWithCredential:failure", task.getException());
                            Toast.makeText(AnonymousAuthActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }
                    }
                });
        // [END link_credential]
    }

    private void updateUI(FirebaseUser user) {

    }
}