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I am developing another bigger project, I want to try a simple DatingApp and currently I try to develope a Login and Registration Form. There is no special register / login button, the code will later decide wether email is registered (-> login) or not (-> register). But even though it's working I am not sure if I make things to complex:


First I want so show a very simple overview of the logic I try to develope:

The App launches with the LogoActivity as a simple SplashScreen. In here the Activity decides which Activity and Fragment is about to be displayed next. It has a sharedElementTransition connected to the AuthOptionActivity.


The AuthOptionActivity only contains the Logo and a fragment Container.

Depending on the AuthStatus it will show the AuthOptionFragment, containing a Layout with two Buttons. Here you can decide which way you want to use for your registration.


In case there is for example an email-registered user but he is not verified yet the AuthOptionActivity will show the MailAuthFragment instead of the AuthOptionFragment.


The MailAuthOptionFragment itselfs contains another two ChildFragments.

The EnterMailSubFragment contains two EditText-Views and the ConfirmMailSubFragment is just a Text containing the Email Adress and a clickable resend textview (not implemented yet).


The code so far implemented is working but it is not that clear as I want it to be.

Logo Activity

public class LogoActivity extends AppCompatActivity {

private ImageView mLogo;
private Handler mHandler;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_logo);
 this.init();


private void init()
 mLogo = findViewById(R.id.activity_logo_logo);
 AuthHandler.performStartUpCheck(new AuthHandler.StartupAuthStatus() 
 @Override
 public void noUser() 
 Toast.makeText(LogoActivity.this, "No User", Toast.LENGTH_SHORT).show();
 performSharedElementTransactionToAuthOption();
 

 @Override
 public void onError(String e) 
 Toast.makeText(LogoActivity.this, e, Toast.LENGTH_SHORT).show();
 performSharedElementTransactionToAuthOption();
 

 @Override
 public void onPhone() 
 Toast.makeText(LogoActivity.this, "Phone", Toast.LENGTH_SHORT).show();
 //direct to loadingActivity
 

 @Override
 public void onEmail(boolean isVerified) 
 Toast.makeText(LogoActivity.this, "Email" + String.valueOf(isVerified), Toast.LENGTH_SHORT).show();
 if(isVerified)
 //direct to LoadingActivity
 else
 performSharedElementTransactionToAuthOption();
 
 
 );
 //this.performSharedElementTransaction();


private void performSharedElementTransactionToAuthOption()
 //check for auth and proceed to Loading
 Intent pIntent = new Intent(LogoActivity.this, AuthOptionActivity.class);
 ActivityOptions mOptions = ActivityOptions.makeSceneTransitionAnimation(LogoActivity.this, mLogo, mLogo.getTransitionName());
 startActivity(pIntent, mOptions.toBundle());



private void performTransactionToLoadingScreen()
 /**dummy**/


@Override
protected void onStop() 
 //Call finish here to avoid flickering 
 this.finish();
 super.onStop();

Nothing so special here, I am quite happy with that class. Disregard some comments, they are just for me as a reminder.


AuthHandler

public class AuthHandler 

public interface StartupAuthStatus
 void noUser();
 void onError(String e);
 void onPhone();
 void onEmail(boolean isVerified);


public interface SignInStatus
 void onEmail(boolean isVerified);


private FirebaseAuth mAuth;
private FirebaseFirestore mFirestore;

/**STARTUP PROCEDURE**/

public static void performStartUpCheck(final StartupAuthStatus mCallback)
 final FirebaseAuth mAuth = FirebaseAuth.getInstance();
 checkStartupAuthStatus(mAuth, mCallback);



private static void checkStartupAuthStatus(FirebaseAuth mAuth, StartupAuthStatus mCallback)
 mAuth = FirebaseAuth.getInstance();
 checkForCurrentUser(mAuth,mCallback);


private static void checkForCurrentUser(FirebaseAuth mAuth, StartupAuthStatus mCallback)
 if(mAuth.getCurrentUser()!=null)
 checkRegistrationMethod(mAuth, mCallback);
 else
 mCallback.noUser();
 


private static void checkRegistrationMethod(final FirebaseAuth mAuth, final StartupAuthStatus mCallback)
 if(mAuth.getUid() == null)
 mCallback.onError("NullPointerInUID");
 return;
 
 FirebaseFirestore.getInstance().collection("Registration").document(mAuth.getUid()).get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() 
 @Override
 public void onComplete(@NonNull Task<DocumentSnapshot> task) 
 if(task.getResult() != null && task.getResult().exists())
 Map<String, Object> mData = task.getResult().getData();
 String mRegistrationForm = (String) mData.get("reg");
 if(mRegistrationForm.equals("mail"))
 checkMailVerificationStatus(mAuth, mCallback);
 else if(mRegistrationForm.equals("phone"))
 mCallback.onPhone();
 
 
 
 ).addOnFailureListener(new OnFailureListener() 
 @Override
 public void onFailure(@NonNull Exception e) 
 mCallback.onError(e.getMessage());
 mAuth.signOut();
 
 );


private static void checkMailVerificationStatus(FirebaseAuth mAuth, StartupAuthStatus mCallback)
 if(mAuth.getCurrentUser().isEmailVerified())
 mCallback.onEmail(true);
 else
 mCallback.onEmail(false);
 


/**LOGIN PROCEDURE**/

public static void enterUserWithEmailAndPassword(String mEmail, String mPassword)
 FirebaseAuth mAuth = FirebaseAuth.getInstance();
 createUserWithEmailAndPassword(mAuth, mEmail, mPassword);


private static void createUserWithEmailAndPassword(FirebaseAuth mAuth, String mEmail, String mPassword)



private static void signUserWithEmailAndPassword(FirebaseAuth mAuth, String mEmail, String mPassword)



private static void sendVerificationEmail(FirebaseAuth mAuth)



private static void setupRegistrationModel(String mModelType)



/**DELETE PROCEDURE**/

This class is made to "outsource" the code mess. Here I am not sure if it's a common or even usefull way to handle this. The Database contains Users (with a lot of Data later) and a Pool of Registrations, here I only store the choosen registration form (field reg(String): "phone" or "mail").

I need to seperate it somehow as the email-registrated-user needs to verify the email.


AuthOptionActivity

public class AuthOptionActivity extends AppCompatActivity 

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_authoption);
 if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
 getWindow().setSharedElementEnterTransition(TransitionInflater.from(this).inflateTransition(android.R.transition.move));
 
 this.checkAuthStatus();


@Override
public void onBackPressed() 
 findViewById(R.id.activity_authoption_logo).setTransitionName(null);
 super.onBackPressed();
 /** Problem occured: SharedViewElement will be visible after App was closed.
 * Reason: The View will try to perform the ExitTransition
 * Solution 1: Delete super.onBackPressed(); and override with finish();
 * Solution 2: Set Transitionname to Null**/


/**The SlideEnter Transition is variable, on First Startup we want a smooth slide in,
 * for phoneauth we want a Left-Side Slide and for Email a Right-Side Slide.
 * The Exit Animation is always slide-out-bottom-smooth.
 * The Reenter Animation is always slide-in-bottom-smooth and due to overlapping
 * the ExitTransition of the View before BackPress will be hidden and is always 0**/

private void performFragmentTransaction(Fragment mFragment, String mTag, Boolean mAddToBackStack, int mEnterTransition)
 FragmentTransaction mFragmentTransaction = getSupportFragmentManager().beginTransaction();
 mFragmentTransaction.setCustomAnimations(mEnterTransition, 0, R.anim.slide_in_bottom_smooth, 0);
 if(mAddToBackStack)
 mFragmentTransaction.addToBackStack(mTag);
 
 mFragmentTransaction.replace(R.id.activity_authoption_container, mFragment, mTag);
 mFragmentTransaction.commit();



/**Check Auth Status: if CurrentUser != null but not Email verified -> Show MailAuth**/
private void checkAuthStatus()
 if(FirebaseAuth.getInstance().getCurrentUser()!=null && !FirebaseAuth.getInstance().getCurrentUser().isEmailVerified())
 //very bad way to force a backstack, still looking for a solution
 this.showAuthOptionFragment();
 this.showMailAuth();
 else
 this.showAuthOptionFragment();
 


/**Handle Fragment Transaction including Listener**/
private void showAuthOptionFragment()
 this.performFragmentTransaction(AuthOptionFragment.newInstance(new AuthOptionFragment.ClickListener() 
 @Override
 public void onMail() 
 showMailAuth();
 

 @Override
 public void onPhone() 
 showPhoneAuth();
 
 ), "AuthOption", false, R.anim.slide_in_bottom);


private void showPhoneAuth()
 this.performFragmentTransaction(_PhoneAuthFragment.newInstance(new _PhoneAuthFragment.AuthStatusListener() 
 @Override
 public void onCancel() 
 //PhoneAuthFragment contains a "back" Button it will fire "onCancel()"
 onBackPressed();
 

 @Override
 public void onSuccess() 
 //show LoadingScreen
 
 ), "PhoneAuth", true, R.anim.slide_in_left_smooth);


private void showMailAuth()
 this.performFragmentTransaction(_MailAuthFragment.newInstance(new _MailAuthFragment.AuthStatusListener() 
 @Override
 public void onCancel() 
 //MailAuthFragment contains a "back" Button it will fire "onCancel()"
 onBackPressed();
 

 @Override
 public void onSuccess() 
 //show LoadingScreen
 
 ), "MailAuth", true, R.anim.slide_in_right_smooth);

For this activity I have some questions:

1. I am checking the Auth Status & email again to decide which fragment to show. It's easy and simple, but repetitive (it will occur again in MailAuthFragment). Is it a common way to repetitive use FirebaseAuth instances?


2. I have seen a couple of fragment -> activity communication solutions using onAttach etc. Is my solution to pass a CustomListener(interface) in the newInstance method okay? Is there any bug that could occur using it that way?

I pretty much like it as it makes the handling easier.

MailAuthOptionFragment

public class _MailAuthFragment extends Fragment 

public interface AuthStatusListener
 void onCancel();
 void onSuccess();


private AuthStatusListener mCallback;
private String mActiveWindow;
private CheckCancelButton mCheckCancelButton;

private String mEmail;
private String mPassword;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 View mView = inflater.inflate(R.layout.fragment_mailauth, container, false);
 this.checkAuthStatus();
 this.initButton(mView);
 return mView;


/**PUBLIC METHODS**/

/**Set the Fragment Listener for AuthOptionActivity**/
public void setListener(AuthStatusListener mCallback)
 this.mCallback = mCallback;


/**Replaces hard coded Instances as Listener will be passed directly**/
public static _MailAuthFragment newInstance(AuthStatusListener mCallback)
 _MailAuthFragment mFragment = new _MailAuthFragment();
 mFragment.setListener(mCallback);
 return mFragment;


/**PRIVATE METHODS**/

/**Check AuthStatus, if CurrentUser!=null but not verified -> Show VerificationScreen**/
private void checkAuthStatus()
 if(FirebaseAuth.getInstance().getCurrentUser() != null && !FirebaseAuth.getInstance().getCurrentUser().isEmailVerified())
 this.showConfirmEmailSubFragment(R.anim.slide_in_right_smooth);
 else
 this.showEnterEmailSubFragment(R.anim.slide_in_right_smooth);
 


/**Handle Registration Process Fragments**/
private void performFragmentTransaction(Fragment mFragment, String mTag, int mEnterAnim)
 mActiveWindow = mTag;
 FragmentTransaction mFragmentTransaction = getChildFragmentManager().beginTransaction();
 mFragmentTransaction.setCustomAnimations(mEnterAnim, 0);
 mFragmentTransaction.replace(R.id.fragment_mailauth_container, mFragment, mTag);
 mFragmentTransaction.commit();


/**MailAuth receives any valid TextChange from SubFragment**/
private void showEnterEmailSubFragment(int mEnterAnim)

 this.performFragmentTransaction(EnterMailSubFragment.newInstance(new EnterMailSubFragment.EnterMailListener() 
 @Override
 public void onEmailChanged(String mEmail) 
 _MailAuthFragment.this.mEmail = mEmail;
 

 @Override
 public void onPasswordChanged(String mPassword) 
 _MailAuthFragment.this.mPassword = mPassword;
 
 ), "EnterMail", mEnterAnim);



/**MailAuth receives resend VerificationEmailRequest from SubFragment**/
private void showConfirmEmailSubFragment(int mEnterAnim)
 this.performFragmentTransaction(new ConfirmMailSubFragment(), "ConfirmMail", R.anim.slide_in_right_smooth);


private void initButton(final View mView)
 /**Custom Button using AfterEffects, Bodymovin and LottieView, contains some commands like "transform to tick"**/
 mCheckCancelButton = new CheckCancelButton((LottieAnimationView)mView.findViewById(R.id.fragment_mailauth_nextBtn));
 mCheckCancelButton.setCustomClickListener(new CheckCancelButton.CheckCancelButtonClickListener() 
 @Override
 public void onClick() 
 switch(mActiveWindow)
 case "EnterMail":
 // the received Email and Password will be passed to AuthHandlerClass - not implemented yet
 break;
 case "ConfirmMail":
 // the AuthHandler will reloard the currentUser and check for email verification Status - not implemented yet
 break;
 
 
 );

Checking AuthStatus again and choosing wether to show the EnterEmailSubFragment or the ConfirmEmailSubFragment. This class contains a button handling both SubFragment pages. This leads to that switch-case method. Not sure if that is a proper way.

EnterMailSubFragment

public class EnterMailSubFragment extends Fragment 

public interface EnterMailListener
 void onEmailChanged(String mEmail);
 void onPasswordChanged(String mPassword);


private EnterMailListener mCallback;
private EditText mEmail, mPassword;
private ImageView mEmailWarning, mPasswordWarning;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 View mView = inflater.inflate(R.layout.subfragment_mailauth, container, false);
 this.initUiWidgets(mView);
 this.initEditText(mView);
 return mView;


public void setEnterMailListener(EnterMailListener mMailListener)
 this.mCallback = mMailListener;


public static EnterMailSubFragment newInstance(EnterMailListener mMailListener)
 EnterMailSubFragment mFragment = new EnterMailSubFragment();
 mFragment.setEnterMailListener(mMailListener);
 return mFragment;


private void initUiWidgets(View mView)
 mEmail = mView.findViewById(R.id.subfragment_mailauth_email_ET);
 mPassword = mView.findViewById(R.id.subfragment_mailauth_password_et);
 mEmailWarning = mView.findViewById(R.id.subfragment_mailauth_email_warning);
 mPasswordWarning = mView.findViewById(R.id.subfragment_mailauth_password_warning);


/**Any Valid Entry will be passed to MailFragment**/

private void initEditText(final View mView)
 mEmail.addTextChangedListener(new TextWatcher() 
 @Override
 public void beforeTextChanged(CharSequence s, int start, int count, int after) 

 

 @Override
 public void onTextChanged(CharSequence s, int start, int before, int count) 

 

 @Override
 public void afterTextChanged(Editable s) 
 if(mEmail.getText() != null && Patterns.EMAIL_ADDRESS.matcher(mEmail.getText().toString()).matches())
 mEmailWarning.setVisibility(View.GONE);
 mCallback.onEmailChanged(mEmail.getText().toString());
 else
 mEmailWarning.setVisibility(View.VISIBLE);
 
 
 );

 mPassword.addTextChangedListener(new TextWatcher() 
 @Override
 public void beforeTextChanged(CharSequence s, int start, int count, int after) 

 

 @Override
 public void onTextChanged(CharSequence s, int start, int before, int count) 
 

 @Override
 public void afterTextChanged(Editable s) 
 if(mPassword.getText() != null && mPassword.getText().length() >= 6)
 mPasswordWarning.setVisibility(View.GONE);
 mCallback.onPasswordChanged(mPassword.getText().toString());
 else
 mPasswordWarning.setVisibility(View.VISIBLE);
 
 
 );

The Textwatcher checks every entry and transfers it to the MailAuthFragment as MailAuthFragment handels the button event (this is for design puposes, I want the content to move and the button is meant to stay in its position).

ConfirmMailAuthSubFragment

public class ConfirmMailSubFragment extends Fragment 

public interface ConfirmMailListener
 void onResendEmail();


private ConfirmMailListener mCallback;

@Override
public void onCreate(@Nullable Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 View mView = inflater.inflate(R.layout.subfragment_confirmmail, container, false);

 return mView;


public void setConfirmMailListener(ConfirmMailListener mCallback)
 this.mCallback = mCallback;


public static ConfirmMailSubFragment newInstance(ConfirmMailListener mCallback)
 ConfirmMailSubFragment mFragment = new ConfirmMailSubFragment();
 mFragment.setConfirmMailListener(mCallback);
 return mFragment;

Nothing special here yet. It will handle the Button Event "Resend Verification Mail" and transfer it to MailAuthFragment.

I know it's a very early stage of my code but as beautiful as it looks with that slide in animations I am not sure if I am running in the wrong direction or making stuff unnecessary complex.