How to separate two different user in firebase android app?

Question

I have an application with two different types of users one as Teacher and the Second a normal user. if a normal member logs in, he will go to normal_memberActivity and if he's a Teacher member, he'll go to Teacher_memberActivity . How do I do this in loginActivity?

My Firebase structure:

this is database firebase rules

 { 
   "rules": {
  ".read": true,

  ".write":true}

}

Answer 1

i have been solving this problem for a week. I'm sorry to say the solution proposed above is kinda misleading. Thus, i have a better solution for this, and its 101% workable !

First, this is my real-time database in Firebase: I created a child "type" for each type of users created. Then, i set seller's account as 1 and buyer's account as 2 inside the "type" child's value.

Second, after i successfully verified the login details. At that particular moment, i use the firebase real-time datasnapshot to pull the type value based on the current user's UID, then i verified whether is the value is equal to 1 or 2. Finally i able to start the activity based on the type of user.

Account Create code:

private void registerUser() {
    progressDialog = new ProgressDialog(this);
    String email = editTextEmail.getText().toString().trim();
    String password = editTextPassword.getText().toString().trim();
    if (TextUtils.isEmpty(email)) {
        Toast.makeText(this, "Please Enter Emailsss", Toast.LENGTH_SHORT).show();
        return;
    }
    if (TextUtils.isEmpty(password)) {
        Toast.makeText(this, "Please Enter Your PASSWORDS", Toast.LENGTH_SHORT).show();
        return;
    }

    progressDialog.setMessage("Registering User Statement..");
    progressDialog.show();


    //Firebase authentication (account save)
    firebaseAuth.createUserWithEmailAndPassword(email, password)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        //user already logged in
                        //start the activity
                        finish();
                        onAuthSuccess(task.getResult().getUser());
                       // startActivity(new Intent(getApplicationContext(), MainActivity.class));

                    } else {
                        Toast.makeText(signupActivity.this, "Could not registered , bullcraps", Toast.LENGTH_SHORT).show();

                    }
                    progressDialog.dismiss();

                }
            });
}
private void onAuthSuccess(FirebaseUser user) {
    //String username = usernameFromEmail(user.getEmail());


    // Write new user
    writeNewUser(user.getUid(), toggle_val, user.getEmail());

    // Go to MainActivity
    startActivity(new Intent(signupActivity.this, MainActivity.class));
    finish();
}

private void writeNewUser(String userId, int type, String email) {
    User user = new User(Integer.toString(type), email);
    if (type == 1){
        mDatabase.child("users").child(userId).setValue(user);
    }
    else {
        mDatabase.child("users").child(userId).setValue(user);
    }
    }
    if (toggleBut.isChecked()){
        toggle_val = 2;
        //Toast.makeText(signupActivity.this, "You're Buyer", Toast.LENGTH_SHORT).show();
    }
    else{
        toggle_val = 1;
        //Toast.makeText(signupActivity.this, "You're Seller", Toast.LENGTH_SHORT).show();
    }

Sign in Account code:

 private void userLogin () {
    String email = editTextEmail.getText().toString().trim();
    String password = editTextPassword.getText().toString().trim();

    if(TextUtils.isEmpty(email)){
        Toast.makeText(this, "Please Enter Emailsss", Toast.LENGTH_SHORT).show();
        return;
    }
    if(TextUtils.isEmpty(password)){
        Toast.makeText(this, "Please Enter Your PASSWORDS", Toast.LENGTH_SHORT).show();
        return;
    }

    progressDialog.setMessage("Login....");
    progressDialog.show();

    firebaseAuth.signInWithEmailAndPassword(email,password)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    progressDialog.dismiss();
                    if(task.isSuccessful()){
                        onAuthSuccess(task.getResult().getUser());
                        //Toast.makeText(signinActivity.this, "Successfully Signed In", Toast.LENGTH_SHORT).show();
                    }
                    else {
                        Toast.makeText(signinActivity.this, "Could not login, password or email wrong , bullcraps", Toast.LENGTH_SHORT).show();
                    }
                }
            });
}

private void onAuthSuccess(FirebaseUser user) {

    //String username = usernameFromEmail(user.getEmail())
    if (user != null) {
        //Toast.makeText(signinActivity.this, user.getUid(), Toast.LENGTH_SHORT).show();
        ref = FirebaseDatabase.getInstance().getReference().child("users").child(user.getUid()).child("type");
        ref.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                String value = dataSnapshot.getValue(String.class);
                //for(DataSnapshot snapshot : dataSnapshot.getChildren()){
                   // Toast.makeText(signinActivity.this, value, Toast.LENGTH_SHORT).show();
                    if(Integer.parseInt(value) == 1) {
                        //String jason = (String) snapshot.getValue();
                        //Toast.makeText(signinActivity.this, jason, Toast.LENGTH_SHORT).show();
                        startActivity(new Intent(signinActivity.this, MainActivity.class));
                        Toast.makeText(signinActivity.this, "You're Logged in as Seller", Toast.LENGTH_SHORT).show();
                        finish();
                    } else {
                        startActivity(new Intent(signinActivity.this, BuyerActivity.class));
                        Toast.makeText(signinActivity.this, "You're Logged in as Buyer", Toast.LENGTH_SHORT).show();
                        finish();
                    }
                }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }

    }

Answer 2

I suggest you have this kind of structure in your database

users
---details...
---type

The type key would now contain whether your user is normal or a teacher. Now using FirebaseAuthentication which I think you already have integrated in your app, you could use:

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

to get the currently logged in user. With that, you can now use:

String uid = user.getUid();

in order to get the UID of the currently logged in user which I think you have used as the key for your users.

Now with the UID ready, you could use a Firebase query to get the type of that specific user and go to the specific Activity based on their type.

Query userQuery = FirebaseDatabase.getInstance().getReference()
                     .child("users").orderByKey().equalTo(uid);
userQuery.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        String type = dataSnapshot.child("type").getValue().toString();
        if(type.equals("Teacher"){
            //Go to TeacherMemberActivity
        } else {
            //Go to NormalMemberActivity
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {

    }
});

Answer 3

You can verify what group a user belongs(teacher or user) by attaching an event listener inside the FirebaseAuth.AuthStateListener and redirecting the user to the appropriate activity as follows

private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference ref;

    mAuthListener = new FirebaseAuth.AuthStateListener() {
        @Override
        public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
            FirebaseUser user = firebaseAuth.getCurrentUser();
            if (user != null) {
                ref = FirebaseDatabase.getInstance().getReference().child("hire-teachers").child("teachers");

                ref.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(DataSnapshot dataSnapshot) {
                        for(DataSnapshot snapshot : dataSnapshot.getChildren()){
                            if(FirebaseAuth.getInstance().getCurrentUser().getUid().equals(snapshot.getKey())){
                                startActivity(new Intent(SignInActivity.this, Teacher_memberActivity.class));
                            }
                        }
                        startActivity(new Intent(SignInActivity.this, Normal_memberActivity.class));
                    }

                    @Override
                    public void onCancelled(DatabaseError databaseError) {

                    }
                });

            } else {
                // User is signed out
            }
            // ...
        }
    };  

In the above implementation of the Firebase API, I am checking to see if the user is a teacher. if true then start the Teacher_memberActivity if not, start the Normal_memberActivity.

Answer 4

Here is the new code:

private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference ref;

mAuthListener = new FirebaseAuth.AuthStateListener() {
    @Override
    public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
        FirebaseUser user = firebaseAuth.getCurrentUser();
        if (user != null) {
            ref = FirebaseDatabase.getInstance().getReference().child("hire-teachers").child("teachers");

            ref.addListenerForSingleValueEvent(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    Boolean boolean = false;
                    for(DataSnapshot snapshot : dataSnapshot.getChildren()){
                        if(FirebaseAuth.getInstance().getCurrentUser().getUid().equals(snapshot.getKey())){
                           boolean = true;
                        }
                    }
                    if(boolean){
                        startActivity(new Intent(SignInActivity.this, Teacher_memberActivity.class));
                    }else{
                        startActivity(new Intent(SignInActivity.this, Normal_memberActivity.class));
                    }
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });

        } else {
            // User is signed out
        }
        // ...
    }
};