CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Zephyros
Zephyros

Reputation: 77

Firebase - Check if data exist and add them

I want to check if user is the member of a specific team, if user isn't he will then be ask to join, if he is, then he will be directed to a page. I did find some of the similar question but for somehow I still couldn't add user to the database. Below is my code and this code crash whenever i click on one of the list.

databaseMembers = FirebaseDatabase.getInstance().getReference("members");

listViewTeams.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            //getting the selected team
            Team team = teams.get(i);
            checkMember();


            //creating an intent
            Intent intent = new Intent(getApplicationContext(), ChatRoomActivity.class);

            //putting team name and id to intent
            intent.putExtra(TEAM_ID, team.getTeamId());
            intent.putExtra(TEAM_NAME, team.getTeamName());

            //starting the activity with intent
            startActivity(intent);
        }
    });

private void checkMember(){
    FirebaseUser user = firebaseAuth.getCurrentUser();
    final String teamMember = user.getEmail();
    databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(dataSnapshot.hasChild(teamMember)){
                finish();
            }
            else{
                databaseMembers.push().setValue(teamMember);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

Logcat:

04-07 12:44:41.167 19091-19091/com.example.user.stfv2 E/AndroidRuntime: FATAL EXCEPTION: main
                                                                    Process: com.example.user.stfv2, PID: 19091
                                                                    com.google.firebase.database.DatabaseException: Invalid Firebase Database path: [email protected]. Firebase Database paths must not contain '.', '#', '$', '[', or ']'
                                                                        at com.google.android.gms.internal.zzbtf.zzjl(Unknown Source)
                                                                        at com.google.firebase.database.DataSnapshot.hasChild(Unknown Source)
                                                                        at com.example.user.stfv2.MainActivity$8.onDataChange(MainActivity.java:352)
                                                                        at com.google.firebase.database.Query$1.onDataChange(Unknown Source)
                                                                        at com.google.android.gms.internal.zzbpx.zza(Unknown Source)
                                                                        at com.google.android.gms.internal.zzbqx.zzZS(Unknown Source)
                                                                        at com.google.android.gms.internal.zzbra$1.run(Unknown Source)
                                                                        at android.os.Handler.handleCallback(Handler.java:739)
                                                                        at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                        at android.os.Looper.loop(Looper.java:148)
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                                        at java.lang.reflect.Method.invoke(Native Method)
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

My Database:

enter image description here

When user click on "heng" team, it will check if user's email exist in the database, if isn't it will then add user's email as a teamMember. I can add the user who created the team, but I can't seem to add users who wants to join later. Really appreciate if someone could help me. Let me know if there's lack of information.

Upvotes: 0

Views: 566

Answers (3)

TeyteyLan
TeyteyLan

Reputation: 197

You problem is written your logcat:

Firebase Database paths must not contain '.', '#', '$', '[', or ']'

But I also look over your code. You can write firebase Query like this.

databaseMembers = FirebaseDatabase.getInstance().getReference("members");
Query q = databaseMembers.orderbyChild("heng").equalTo(user.getEmail());

You can write dynamic I just give a example.

Upvotes: 0

Amit Upadhyay
Amit Upadhyay

Reputation: 7391

You problem is clearly mentioned in your logcat:

Firebase Database paths must not contain '.', '#', '$', '[', or ']'

I think it doesn't even accept '@'. The proper way to add your user into the DB is to use users uid.

Eg:

FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();

In your code you can do something like this:

private void checkMember(){
    FirebaseUser user = firebaseAuth.getCurrentUser();
    final String teamMember = user.getUid();
    databaseMembers.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if(dataSnapshot.hasChild(teamMember)){
                finish();
            }
            else{
                databaseMembers.push().setValue(teamMember);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
}

Upvotes: 0

Alex Mamo
Alex Mamo

Reputation: 138824

The problem is that Firebase does not accept . (dot) symbol in the key. So in order to use an email address, you need to have an encoding method. The email addres must be name@mail,com (see the , comma) in stead of [email protected] as it is in your case. These are the methods to encode and decode the email address.

static String encodeUserEmail(String userEmail) {
    return userEmail.replace(".", ",");
}
static String decodeUserEmail(String userEmail) {
    return userEmail.replace(",", ".");
}

This methods will solve your problem.

Upvotes: 1

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