Firebase query does not display chat

Question

I have a method for a chat app, everything seems to run with no errors but every time I try to type something nothing pops up.

When users log in, the onActivityResult shows the success message:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == SIGN_IN_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            Snackbar.make(activity_main, "Success. Welcome.", Snackbar.LENGTH_SHORT).show();
        }
        else {
            Snackbar.make(activity_main, "Error", Snackbar.LENGTH_SHORT).show();
            finish();
        }
    }
}

However, it does not show my onCreate welcome message after:

if(FirebaseAuth.getInstance().getCurrentUser() == null) {
    startActivityForResult(AuthUI.getInstance().createSignInIntentBuilder().build(), SIGN_IN_REQUEST_CODE);
}
else {
    Snackbar.make(activity_main, "Welcome " + FirebaseAuth.getInstance().getCurrentUser().getEmail(), Snackbar.LENGTH_SHORT);
    //Load content
    displayChat();
}

When a message is typed, nothing shows up too. Am I querying incorrectly?

private void displayChat() {

    ListView listOfMessage = findViewById(R.id.list_of_message);

    Query query = FirebaseDatabase.getInstance().getReference();
    FirebaseListOptions<Chat> options = new FirebaseListOptions.Builder<Chat>()
            .setLayout(R.layout.list_item)
            .setQuery(query, Chat.class)
            .build();

    adapter = new FirebaseListAdapter<Chat>(options) {
        @Override
        protected void populateView(View v, Chat model, int position) {
            //Get reference to the views of list_item.xml
            TextView messageText, messageUser, messageTime;
            messageText = v.findViewById(R.id.message_text);
            messageUser = v.findViewById(R.id.message_user);
            messageTime = v.findViewById(R.id.message_time);

            messageText.setText(model.getMessageText());
            messageUser.setText(model.getMessageUser());
            messageTime.setText(DateFormat.format("dd-MM-yyyy (HH:mm:ss)", model.getMessageTime()));
        }
    };
    listOfMessage.setAdapter(adapter);
}

My database seems to be fine, with no errors on input:

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

sorry i didn't mean rules i mean how are you storing data in firebase database — Faiizii Awan, Sep 02 '18 at 06:22
check this question https://stackoverflow.com/questions/52128852/getting-data-from-firebase-using-orderbychild-query/52129459?noredirect=1#comment91218444_52129459 — Faiizii Awan, Sep 02 '18 at 06:31
Please add your database structure and please responde with @. — Alex Mamo, Sep 03 '18 at 10:22

score 0 · Answer 1 · answered Sep 02 '18 at 06:49

You need to get the refrence for a database and then query on it:

final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();

Query on it something like this, based on you requirement :-

Query query = reference.child("Chat_room");
query.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        if (dataSnapshot.exists()) {
            // dataSnapshot is the "chat_room" node with all children 
            for (DataSnapshot issue : dataSnapshot.getChildren()) {
                // do something with the individual "issues"
            }
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {

    }
});

Note :- make sure your database has been created , the structure in which you are saving the chat messages to the databse is important for way you want to retrieve and display the chats.

Firebase query does not display chat

1 Answers1