firebase read data firestore

read data firestore java

DocumentReference docRef = db.collection("cities").document("SF");
docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
    @Override
    public void onComplete(@NonNull Task<DocumentSnapshot> task) {
        if (task.isSuccessful()) {
            DocumentSnapshot document = task.getResult();
            if (document.exists()) {
                Log.d(TAG, "DocumentSnapshot data: " + document.getData());
            } else {
                Log.d(TAG, "No such document");
            }
        } else {
            Log.d(TAG, "get failed with ", task.getException());
        }
    }
});

Posted by: Guest on September-11-2021

useEffect(() => { db.collection('posts') .orderBy('timestamp', 'asc') // optional .onSnapshot((snapshot) => { setPosts( snapshot.docs.map((doc) => { return doc.data(); }) ); }); }, []);

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