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If Equal to String Doesn't Work in Firestore Snapshot Listener [duplicate]

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Building an Android chat app using Firebase Firestore database.

I wanted to check if a message in the database was sent by the current user, or another user. This way, I can display the chat bubbles right or left accordingly. However, I'm not able to compare as the comparison always returns "NOT TRUE", although I can't understand why. Check it out:

I'm comparing the userID with the sender's userID that I store in Firestore. They print out the same in the log. But when I compare them in an if-statement. It says they're not equal.

public void getLiveChatMessages(final ArrayList<ChatConversationMessage> messageArrayList)
db.collection("users")
.document(userID)
.collection("conversations")
.document("conversation0") //Specified conversation
.collection("messages")
.addSnapshotListener(new EventListener<QuerySnapshot>()
@Override
public void onEvent(@Nullable QuerySnapshot value,
@Nullable FirebaseFirestoreException e)
if (e != null)
Log.w(TAG, "Listen failed.", e);
return;


for (QueryDocumentSnapshot doc : value)
if (doc.get("message") != null)
String messageSender = doc.getString("From user with ID");

if (messageSender == userID)
Log.e(TAG, "the messageSender IS equal to the userID");
Log.e(TAG, "the messageSender: " + messageSender);
Log.e(TAG, "the userID: " + userID);
else
Log.e(TAG, "the messageSender is NOT equal to the userID");
Log.e(TAG, "the messageSender: " + messageSender);
Log.e(TAG, "the userID: " + userID);


Log.d(TAG, "Message: " + messageArrayList);


);



and here is my Log output:

E/chat: the messageSender is NOT equal to the userID

the messageSender: ypiXrobQxuZ0wplN5KO8gJR7Z4x2

the userID: ypiXrobQxuZ0wplN5KO8gJR7Z4x2

how can they not be equal???

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2 Answers
2

use

if (messageSender.equals(userID))
if (messageSender.equalsIgnoreCase(userID)) // its not case senstive


instead of

if (messageSender == userID)


for string comparison use equalsIgnoreCase

equalsIgnoreCase

i.e

if (messageSender.equalsIgnoreCase(userID))

.
.
.

else



Refer this