Develop Reference

Why FirebaseAuth.getCurrentUser() is returning null

I’m reprogramming/reproducing whatsapp for android and I’m facing a problem.
In my app, users have to register their self to use it. After the registration, users are directed to the MainActivity where they can start chatting with their friends or they can complete their profile. Users can Login to the app but only if they Logout. They don't have to Login after the registration.
I'm using the Firebase technologies, Firebase Authentication, Firebas database, Firebase storage on the app. When the user complete his registration, his information are stored in the real-time database.
Here's the problem I registered my self and instead of going directly to the MainActivity, i'm directed to LoginActivity and that can happen only if
the currentUser is null. If the currentUser is null, it means that FirebasAuth.getCurrentUser() is returning null.
I want to understand why is this hapenning ? Why my currentUser variable is null when I registered my self only few seconds ago ? Why is FirebasAuth.getCurrentUser()
returning null when i can see that my informations are stored on the Firebase database?
Here's the code of RegisterActivity :
public class RegisterActivity extends AppCompatActivity {
private Button createUser;
private EditText registerEmail, registerPassword;
private TextView haveAccount;
private FirebaseAuth mAuth;
private DatabaseReference RootRef;
private ProgressDialog loadingBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mAuth=FirebaseAuth.getInstance();
RootRef= FirebaseDatabase.getInstance().getReference();
initializeFields();
haveAccount.setClickable(true);
haveAccount.setFocusable(true);
haveAccount.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SendUserToLoginActivity();
}
});
createUser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
createNewAccount();
}
});
}
private void createNewAccount() {
final String email=registerEmail.getText().toString();
String password=registerPassword.getText().toString();
if (TextUtils.isEmpty(email))
Toast.makeText(this,"Please enter an address mail to create an account",Toast.LENGTH_LONG).show();
if (TextUtils.isEmpty(password)) {
Toast.makeText(this, "Please enter an address mail to create an account", Toast.LENGTH_LONG).show();
} else {
loadingBar.setTitle("Create new Account");
loadingBar.setMessage("Please wait, while we creating account for you");
loadingBar.setCanceledOnTouchOutside(true);
loadingBar.show();
mAuth=new FirebaseAuth(FirebaseApp.initializeApp(RegisterActivity.this));
mAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task)
{
if (task.isSuccessful()) {
String currentUserID=mAuth.getCurrentUser().getUid();
RootRef.child("Users").child(currentUserID).setValue(email);
SendUserToMainActivity();
Toast.makeText(RegisterActivity.this, "Your account is created successfully", Toast.LENGTH_LONG).show();
loadingBar.dismiss();
}
else {
String message=task.getException().toString();
Toast.makeText(RegisterActivity.this,"Error " + message,Toast.LENGTH_LONG).show();
loadingBar.dismiss();
}
}
});
}
}
private void initializeFields() {
createUser=findViewById(R.id.register_button);
registerEmail=findViewById(R.id.register_email);
registerPassword=findViewById(R.id.register_password);
haveAccount=findViewById(R.id.already_have_account_link);
loadingBar= new ProgressDialog(this);
}
private void SendUserToLoginActivity() {
StartActivity(RegisterActivity.this,LoginActivity.class);
}
private void SendUserToMainActivity() {
StartActivity(RegisterActivity.this,MainActivity.class);
}
private void StartActivity(Context c, Class<?> activity){
Intent i=new Intent(c,activity);
if(activity.equals(MainActivity.class)) {
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);
finish();
} else
startActivity(i);
}
And here's the code of my MainActivity
public class MainActivity extends AppCompatActivity {
private Toolbar mToolbar;
private ViewPager myViewPager;
private TabLayout myTabLayout;
private TabsAccessorAdapter myTabsAccessorAdapter;
private FirebaseUser currentUser;
private FirebaseAuth mAuth;
private DatabaseReference RootRef;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
RootRef= FirebaseDatabase.getInstance().getReference();
mToolbar=findViewById(R.id.main_page_toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("WhatsApp");
myViewPager=findViewById(R.id.main_tabs_pager);
myTabsAccessorAdapter=new TabsAccessorAdapter(getSupportFragmentManager());
myViewPager.setAdapter(myTabsAccessorAdapter);
myTabLayout = findViewById(R.id.main_tabs);
myTabLayout.setupWithViewPager(myViewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.options_menu,menu);
return true;
}
#Override
public boolean onOptionsItemSelected(#NonNull MenuItem item) {
if (item.getItemId()==R.id.main_find_friends_option){
}
if (item.getItemId()==R.id.main_create_group_option){
requestNewGroup();
}
if (item.getItemId()==R.id.main_settings_option){
SendUserToSettingsActivity();
}
if (item.getItemId()==R.id.main_logout_option){
mAuth.signOut();
SendUserToLoginActivity();
}
return true;
}
#Override
protected void onStart() {
super.onStart();
currentUser = mAuth.getCurrentUser();
if(currentUser==null)
SendUserToLoginActivity();
else
verifyUserID();
}
private void SendUserToLoginActivity() {
StartActivity(MainActivity.this,LoginActivity.class);
}
private void StartActivity(Context c, Class<?> activity){
Intent i=new Intent(c,activity);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);
finish();
}

After creating or signing in the user, it takes a brief moment before FirebaseAuth.getInstance().getCurrentUser() picks up this change. So if you're using that variable in the meantime, you will get null.
There are two options to work around this:
Use the Task<AuthResult> task that you get after creating the user. So String currentUserID=task.getResult().getUser().getUid(); and pass that along to the new activity in the intent.
Use an AuthStateListener to pick up the authentication state in the next activity.
FirebaseAuth.getInstance().addAuthStateListener(new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// Sign in logic here.
}
}
};)

two different app logins on single Firebase project Problem

I have a Problem in the login. Basically, I tell you my scenario.
I have two apps both are connected with a single firebase project.
One app contains driver login and other app contain customer login
When I open a customer app and register the new customer. The customer is successfully registered. And then I open the driver app and entered the customer credential means (Customer email & password) its login successfully and open the driver activity and vice-versa.
how to fix this issue I am using firebase.
customer login activity
public class CustomerLoginActivity extends AppCompatActivity {
private EditText mEmail, mPassword;
private Button mLogin, mRegistration;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener firebaseAuthListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_customer_login);
mAuth = FirebaseAuth.getInstance();
firebaseAuthListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if(user!=null ){
Intent intent = new Intent(CustomerLoginActivity.this, CustomerMapActivity.class);
startActivity(intent);
finish();
return;
}
}
};
mEmail = (EditText) findViewById(R.id.email);
mPassword = (EditText) findViewById(R.id.password);
mLogin = (Button) findViewById(R.id.login);
mRegistration = (Button) findViewById(R.id.registration);
mRegistration.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(CustomerLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(CustomerLoginActivity.this, "sign up error", Toast.LENGTH_SHORT).show();
}else{
String user_id = mAuth.getCurrentUser().getUid();
DatabaseReference current_user_db = FirebaseDatabase.getInstance().getReference().child("Users").child("Customers").child(user_id);
current_user_db.setValue(true);
}
}
});
}
});
mLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(CustomerLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(CustomerLoginActivity.this, "sign in error", Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
#Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(firebaseAuthListener);
}
#Override
protected void onStop() {
super.onStop();
mAuth.removeAuthStateListener(firebaseAuthListener);
}
}
driver login activity
public class DriverLoginActivity extends AppCompatActivity {
private EditText mEmail, mPassword;
private Button mLogin, mRegistration;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener firebaseAuthListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_driver_login);
mAuth = FirebaseAuth.getInstance();
firebaseAuthListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if(user!=null){
Intent intent = new Intent(DriverLoginActivity.this, DriverMapActivity.class);
startActivity(intent);
finish();
return;
}
}
};
mEmail = (EditText) findViewById(R.id.email);
mPassword = (EditText) findViewById(R.id.password);
mLogin = (Button) findViewById(R.id.login);
mRegistration = (Button) findViewById(R.id.registration);
mRegistration.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(DriverLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(DriverLoginActivity.this, "sign up error", Toast.LENGTH_SHORT).show();
}else{
String user_id = mAuth.getCurrentUser().getUid();
DatabaseReference current_user_db = FirebaseDatabase.getInstance().getReference().child("Users").child("Drivers").child(user_id).child("name");
current_user_db.setValue(email);
}
}
});
}
});
mLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(DriverLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(!task.isSuccessful()){
Toast.makeText(DriverLoginActivity.this, "sign in error", Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
#Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(firebaseAuthListener);
}
#Override
protected void onStop() {
super.onStop();
mAuth.removeAuthStateListener(firebaseAuthListener);
}
}
My database rules

Firebase authentication doesn't differentiate between different "types" of users, like you're trying to do. You'll have to implement some custom logic of your own in your app(s) to handle these situations. The base signInWithEmailAndPassword() method will always work if you provide it correct credentials... so what you need to do is in your app code, BEFORE you call the signInWithEmailAndPassword() method, check to see if the provided username is "allowed" to use this version of the app...
So as soon as you get their username, before calling that signIn method, make a query to the database to determine whether that username belongs to a "customer" or a "driver". I assume you have something like a /users node in your database - if you don't, you'll need to create one, there's no way around it. If you're not sure how to query the database, use the addListenerForSingleValueEvent() method... check out the official docs for examples/syntax.
Once you've determined whether the username is for a customer vs a driver... you will need to implement logic to decide whether they are allowed to proceed to the signIn method.
If they are a "customer" and this is the "customer" app, then allow the code to proceed to the signIn method... but if the username comes back as a "driver" then stop the code and display an error to the user.
Similarly for the "driver" app, if the username comes back as being for a "driver" then allow the code to proceed to the signIn method... but if it comes back as a "customer" then stop the code and display an error to the user.

MainActivty should lead to LoginActivity but skips it. Leads to MapActivity that should only be visible after login

I seem to have altered something in my code and I can't figure out what it is I need to revert.
I'm building an app that will have a MainActivity that will lead to a loginActivity. However, when the login button is pressed the app is now skipping that and going to a MapActivity that should only be visible to logged in users.
I've checked my MainActivity code and I don't think the problem is there, I think it's the LoginActivity code:
public class ResponderLoginActivity extends AppCompatActivity {
private EditText mEmail, mPassword;
private Button mLogin, mRegistration;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener firebaseAuthListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_responder_login);
mAuth = FirebaseAuth.getInstance();
firebaseAuthListener = new FirebaseAuth.AuthStateListener() {
#Override
public void onAuthStateChanged(#NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
if (user != null) {
Intent intent = new Intent(ResponderLoginActivity.this, ResponderMapActivity.class);
startActivity(intent);
finish();
return;
}
}
};
mEmail = (EditText) findViewById(R.id.email);
mPassword = (EditText) findViewById(R.id.password);
mLogin = (Button) findViewById(R.id.login);
mRegistration = (Button) findViewById(R.id.registration);
mRegistration.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.createUserWithEmailAndPassword(email, password).addOnCompleteListener(ResponderLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
Toast.makeText(ResponderLoginActivity.this, "sign up error", Toast.LENGTH_SHORT).show();
} else {
String user_id = mAuth.getCurrentUser().getUid();
DatabaseReference current_user_db = FirebaseDatabase.getInstance().getReference().child("Users").child("Responders").child(user_id);
current_user_db.setValue(true);
}
}
});
}
});
mLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
final String email = mEmail.getText().toString();
final String password = mPassword.getText().toString();
mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(ResponderLoginActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if (!task.isSuccessful()) {
Toast.makeText(ResponderLoginActivity.this, "Sign in error", Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
#Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(firebaseAuthListener);
}
#Override
protected void onStop() {
super.onStop();
mAuth.removeAuthStateListener(firebaseAuthListener);
}
}

How to fetch the department name for a particular User from Firebase in Android

My Database in firebase is in this format
I need that if a user login then for that particular UID I need his associated department name. So How to take the department name as a String.I use this code to fetch department name
String u_id=auth.getCurrentUser().getUid();
mdatabase=FirebaseDatabase.getInstance().getReference().child("Users").child(u_id).child("department");
user=mdatabase.getKey();
By this i don't get the result.Please provide solution
public class LoginPage extends AppCompatActivity {
private Button btnLogin;
private TextView ForgetText;
private EditText userText,PassText;
private String UserEmail,UserPassword;
private FirebaseAuth auth;
private FirebaseAuth.AuthStateListener mAuthlistener;
private ProgressBar progressBar;
private DatabaseReference mdatabase;
public String departmental;
//private Spinner dropdown;
Variables v=new Variables();
private String username,user;
private Intent i;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_page);
auth=FirebaseAuth.getInstance();
btnLogin=(Button)findViewById(R.id.btn_login);
ForgetText=(TextView)findViewById(R.id.textView3);
userText=(EditText)findViewById(R.id.email2);
PassText=(EditText)findViewById(R.id.password2);
progressBar=(ProgressBar)findViewById(R.id.progressBar2);
btnLogin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
SignIn();
}
});
ForgetText.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
startActivity(new Intent(LoginPage.this,ForgotPassword.class));
}
});
}
public void SignIn(){
UserEmail=userText.getText().toString().trim();
UserPassword=PassText.getText().toString().trim();
if (UserEmail.isEmpty()){
Toast.makeText(LoginPage.this,"Please Enter the Email
Id",Toast.LENGTH_LONG).show();
}
else if (UserPassword.isEmpty())
{
Toast.makeText(LoginPage.this,"Please enter Valid
Password",Toast.LENGTH_LONG).show();
}
else {
auth.signInWithEmailAndPassword(UserEmail, UserPassword)
.addOnCompleteListener(LoginPage.this, new
OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
// 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()) {
// there was an error
Toast.makeText(LoginPage.this,"Error in
logging!!",Toast.LENGTH_LONG).show();
} else
{
if(FirebaseAuth.getInstance().getCurrentUser().getEmail().equals(v.admin))
startActivity(new
Intent(LoginPage.this,AdminUser.class));
else {
String u_id =
auth.getInstance().getCurrentUser().getUid();
mdatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(u_id).child("department");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String department = (String) dataSnapshot.getValue();
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
mdatabase.addListenerForSingleValueEvent(eventListener);
Toast.makeText(LoginPage.this,u_id,Toast.LENGTH_LONG).show();
Toast.makeText(LoginPage.this,departmental,Toast.LENGTH_LONG).show();
/*i = new Intent(LoginPage.this, LoggedIn.class);
i.putExtra("hello_user",department);
startActivity(i);*/
}
Toast.makeText(LoginPage.this, "Logged In", Toast.LENGTH_LONG).show();
}
}
});
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}

Please use this code:
String u_id = auth.getCurrentUser().getUid();
mdatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(u_id).child("department");
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
String department = (String) dataSnapshot.getValue();
Log.d("TAG", department);
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
mdatabase.addListenerForSingleValueEvent(eventListener);
Hope it helps.

Junit Testing for an Android Activity

Does any one have any experience with creating unit-test for the On Create and OnClick method in java, using Android Studio? I use data from my Firebasedatabase.
I think I have to use Mock-object, but I don't knot where to start.
Under is the code from my class LoginActivity
public class LoginActivity extends AppCompatActivity implements View.OnClickListener{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
mfireBaseAuth = FirebaseAuth.getInstance();
mDatabase = FirebaseDatabase.getInstance().getReference();
mProgressDialog = new ProgressDialog(this);
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
buttonSignIn = (Button) findViewById(R.id.buttonSignIn);
textViewSignUp = (TextView) findViewById(R.id.textViewSignUp);
buttonSignIn.setOnClickListener(this);
textViewSignUp.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(v == buttonSignIn){
usersignin();
}
if(v==textViewSignUp){
startActivity(new Intent(this, RegisterActivity.class));
}
}
private void usersignin() {
String email = editTextEmail.getText().toString().trim();
String password = editTextPassword.getText().toString().trim();
if(TextUtils.isEmpty(email)){
Toast.makeText(this, "Please enter Email", Toast.LENGTH_SHORT).show();
return;
}
if(TextUtils.isEmpty(password)){
Toast.makeText(this, "Please enter password", Toast.LENGTH_SHORT).show();
return;
}
mProgressDialog.setMessage("Logging in. Please wait...");
mProgressDialog.show();
mfireBaseAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
mProgressDialog.dismiss();
if(task.isSuccessful()){
getSignedInUserProfile();
}
}
});
}
private void getSignedInUserProfile() {
DatabaseReference reference = mDatabase;//.child("eduback-2feef");
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
userID = firebaseUser.getUid();
reference.child("Users").child(userID).child("User info").addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
User user = dataSnapshot.getValue(User.class);
if(user != null) {
// Save if the user is student or prof in shared prefs.
PreferenceHelper helper = new PreferenceHelper(getBaseContext());
helper.setIsStudent(user.isStudent);
checkStudentOrProfessor(user);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
// Ups vis error
}
});
}
private void checkStudentOrProfessor(User user) {
Intent i;
if (user.isStudent ) {
i = new Intent(this, MainActivityStudent.class);
} else {
i = new Intent(this, MainActivityProfessor.class);
}
startActivity(i);
}
}

The Mockito mocking framework for Java offers compatibility with Android unit testing.
You can configure mock objects to return some specific value when invoked.
You don't need to test Firebasedatabass.
But you have to make Firebasedatabase wrapper class for yours view
Wrapper class have to include variable(userID, user.isStudent)