akashocx17 / LlamaChat

A chat app for Android. Uses Firebase Database and Authentication.

LlamaChat

A chat app for Android. Uses Firebase Realtime Database and one touch sign in with Google Authentication.

Setup

Add Firebase to your project

• https://firebase.google.com/docs/android/setup

---

Add google-services.json file

• Download google-services.json from the settings menu in firebase console.

• Copy the file to the correct app module project directory.

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User Authentication with Google Sign-In

• https://firebase.google.com/docs/auth/android/google-signin

Authenticating Your Client and getting your app's SHA-1 fingerprint.

• https://developers.google.com/android/guides/client-auth

FirebaseAuth class is the entry point of the Firebase Authentication SDK.

The class is instanciated by calling getInstance().

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        mAuth = FirebaseAuth.getInstance();
        ...
     }

---

The AuthSateChanged method gets invoked on the main thread:

• Right after the listener has been registered
• When a user is signed in
• When the current user is signed out
• When the current user changes

       mAuthListener = new FirebaseAuth.AuthStateListener() {
           @Override
           public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
               if (firebaseAuth.getCurrentUser() != null){
                   startActivity(new Intent(SignInActivity.this, ContactsActivity.class));
               }
           }
       };

---

Always authenticate by passing in the token using the method: getIdToken

  private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
       AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
       mAuth.signInWithCredential(credential)
               .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", "signInWithCredential:success");
                           FirebaseUser user = mAuth.getCurrentUser();
                           //updateUI(user);
                       } else {
                           // If sign in fails, display a message to the user.
                           Log.w("TAG", "signInWithCredential:failure", task.getException());
                         , Snackbar.LENGTH_SHORT).show();
                           //updateUI(null);
                       }

                   }
               });
   }