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Firebase Realtime Database Update Data - Android Java


Firebase Realtime Database Update Data - Android Java

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Firebase Realtime Database Update Data - Android Java
Tag : java , By : Singularity
Date : December 01 2020, 04:50 PM

it fixes the issue Your problem is that instead of storing a constant and valid key in your firebase database, every time you change your profile you create a new node. How so? Well, you do this:
String key = myRef.push().getKey();
String key = FirebaseAuth.getInstance().getCurrentUser().getUid();
myRef.child(key).setValue(user);
myRef.child(key).setValue(data); //For updating
myRef.child(key).updateChildren(data); //For updating

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how do i update my listView after deleting the data in firebase realtime database


Tag : android , By : CrimsonGore
Date : March 29 2020, 07:55 AM
should help you out After call of for loop of appleSnapshot.getRef().removeValue(); then remove that position item from arraylist , then call notifydatasetchanged and check like below
public void deleteTask(View view) {

    int index=listView.getPositionForView(view);
    String str= (String) arrayAdapter.getItem(index++);

    DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
    Query taskQuery = ref.child("Todo").orderByChild("Task").equalTo(str);
    taskQuery.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot appleSnapshot: dataSnapshot.getChildren()) {
                appleSnapshot.getRef().removeValue();
            }
            arrayList.remove(listView.getPositionForView(view)); // remove the item from list
            arrayAdapter.notifyDataSetChanged();// notify the changed
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.e("TAG", "onCancelled", databaseError.toException());
        }
    });

}

Getting Data from Firebase realtime database, Android Studio, Java


Tag : java , By : omaidog
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am looking for a way to get data from the firebase real-time database in a format like an array[] or a String. , To get the a list of uids, please use the following code:
DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference usersRef = rootRef.child("Users");
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        List<String> list = new ArrayList<>();
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String uid = ds.getKey();
            list.add(uid);
        }

        //Do what you need to do with your list
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage()); //Don't ignore errors!
    }
};
usersRef.addListenerForSingleValueEvent(valueEventListener);

Unable to update Firebase Realtime Database in Android


Tag : java , By : PaulPlum
Date : March 29 2020, 07:55 AM
I wish this helpful for you Some changes I can suggest which will make your code more clear and easy to debug.
First use names for your database references which identify node in database so:
FirebaseDatabase db = FirebaseDatabase.getInstance();

DatabaseReference userProfileRef = db.getReference("users").child(userId);
map.add("email",email)
map.add("name",name);
userProfileRef.update(map);

How to retrieve array data from children node in Firebase Realtime Database Java? (Firebase Recycler Adapter)


Tag : java , By : scotta01
Date : March 29 2020, 07:55 AM
it helps some times The problem in your code is that your url_photo_collage field is declared in your DolanItemClass class of type String while in your database is an array. To solve this, change the type of your field from String to a List and get it accordingly in your adapter.

Get realtime data change update when data changes on Firebase Realtime Database


Tag : java , By : redha
Date : March 29 2020, 07:55 AM
hope this fix your issue If you need to get data in real-time, you should use a real-time listener. To solve this, please change your code to:
FirebaseDB.batch.child(batch).addValueValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            //Update recyclerview here
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });
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