Wsrtjtyk

i am recently created an app which is still in development.
In need your help because, whenever i get data from firebase database i comes single data in multiple times. Look below my code, database where you get my question properly and you also get what i'm trying to say.

My code :

public class FragmentChat extends Fragment

{

EditText mMsgInput;

Button mSend;

LinearLayout mMsgContainerTv;

ScrollView mMsgContainer;

ProgressDialog mProgressDialog;



String name, email, image;



FirebaseAuth mAuth;

DatabaseReference mDataRef, mChatroomRef, mMessageRef;



@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)

{

    super.onCreateView(inflater, container, savedInstanceState);



    View chat = inflater.inflate(R.layout.fragment_chat, container, false);



    mMsgInput = (EditText) chat.findViewById(R.id.fragment_chatETMsg);

    mSend = (Button) chat.findViewById(R.id.fragment_chatBTSend);

    mMsgContainerTv = (LinearLayout) chat.findViewById(R.id.fragment_chatLLMsgContainer);

    mMsgContainer = (ScrollView) chat.findViewById(R.id.fragment_chatSVMsgContainer);



    mAuth = FirebaseAuth.getInstance();

    mDataRef = FirebaseDatabase.getInstance().getReference();

    mChatroomRef = FirebaseDatabase.getInstance().getReference().child("Chatroom");



    if(mAuth.getCurrentUser() == null){

        Toast.makeText(getActivity(), "Please Login First", Toast.LENGTH_SHORT).show();

    }else{

        mProgressDialog = new ProgressDialog(getActivity());

        mProgressDialog.setTitle("Loading data...");

        mProgressDialog.setMessage("Please wait while we load your data into activity...");

        mProgressDialog.setCanceledOnTouchOutside(false);

        mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);

        mProgressDialog.show();



        mDataRef.child("Users").child(mAuth.getCurrentUser().getUid()).addValueEventListener(new ValueEventListener(){

                @Override

                public void onDataChange(DataSnapshot dataSnapshot)

                {

                    name = dataSnapshot.child("name").getValue().toString();

                    email = dataSnapshot.child("email").getValue().toString();

                    image = dataSnapshot.child("image").getValue().toString();



                    mProgressDialog.dismiss();

                }



                @Override

                public void onCancelled(DatabaseError p1)

                {

                    mProgressDialog.dismiss();

                }

            });



        sendmsg();

    }

    return chat;

}



@Override

public void onStart()

{

    super.onStart();



    if(mAuth.getCurrentUser() != null){

        mChatroomRef.addChildEventListener(new ChildEventListener(){

                @Override

                public void onChildAdded(DataSnapshot data, String s)

                {

                    if(data.exists()){

                        displayMsg(data);

                    }

                }



                @Override

                public void onChildChanged(DataSnapshot data, String s)

                {

                    if(data.exists()){

                        displayMsg(data);

                    }

                }



                @Override

                public void onChildRemoved(DataSnapshot data)

                {

                }



                @Override

                public void onChildMoved(DataSnapshot data, String s)

                {

                }



                @Override

                public void onCancelled(DatabaseError ata)

                {

                }

            });

    }

}



private void sendmsg()

{

    mSend.setOnClickListener(new OnClickListener(){

            @Override

            public void onClick(View v)

            {

                String msg = mMsgInput.getText().toString();



                HashMap<String, Object> mHashmapS = new HashMap<String, Object>();

                mChatroomRef.updateChildren(mHashmapS);

                String mMessageKey = mChatroomRef.push().getKey();

                mMessageRef = mChatroomRef.child(mMessageKey);

                HashMap<String, Object> mHashmapMessage = new HashMap<String, Object>();

                mHashmapMessage.put("name", name);

                mHashmapMessage.put("msg", msg);

                mMessageRef.updateChildren(mHashmapMessage);



                mMsgInput.setText("");



                Toast.makeText(getActivity(), "Message sent successfully...", Toast.LENGTH_SHORT).show();

            }

        });

}



private void displayMsg(DataSnapshot data)

{

    Iterator it = data.getChildren().iterator();

    while(it.hasNext()){

        String msgMsg = (String) ((DataSnapshot) it.next()).getValue();

        String msgName = (String) ((DataSnapshot) it.next()).getValue();



        LayoutInflater mInflator = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        View mView = mInflator.inflate(R.layout.item_msg, null);

        TextView mMsgView = (TextView) mView.findViewById(R.id.item_msgTVMsg);

        mMsgView.append(msgName + " :n" + msgMsg + "n ");

        mMsgContainerTv.addView(mView, 0, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));



        mMsgContainer.fullScroll(ScrollView.FOCUS_DOWN);

    }

}

}

My database structure :
chatroom >> messagekey >> 1. msg, 2. name

In my application i got multiple times same msg and name

And also i want data in way it is in database structure into the my app.

If you want to read the user profile information only once, use addListenerForSingleValueEvent instead of addValueEventListener. So:

mDataRef.child("Users").child(mAuth.getCurrentUser().getUid()).addListenerForSingleValueEvent(new ValueEventListener(){

Also see the Firebase documentation on reading data once.