firebase-realtime-database

问题 This question already has an answer here : firebase query methods startAt() taking case sensitive parameters (1 answer) Closed last year . I am using Firebase database for my Android Application. I implemented search feature in the app. On my database, every title start with "A" is showing only when I started a search with Capital "A". When I entered lower case "a" it showing no results found. I want to enable search for lower case variation also. Help me, please. Thank you. Here is my search

问题 so i'm trying to call realtime database from inside a firebasemessagingservice to get some infos from the database but each and every time the app is on background this error is happening 09-17 19:27:21.596 4083-4140/? E/AndroidRuntime: FATAL EXCEPTION: Firebase-MyFirebaseMessagingService Process: com.kirtu.simpletexts.texts, PID: 4083 java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:200) at android

问题 I'm getting permission denied after I have authenticated with Anonymous Auth [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception: E/flutter (21033): PlatformException(-3, Permission denied, ) ... _getCurrentUser: FirebaseUser({providerId: firebase, uid: DOIL...............u54j1, displayName: , email: , isAnonymous: true, isEmailVerified: false, providerData: [{providerId: firebase, uid: DOIL//////////////54j1, displayName: , email: }]}) My rules on the Firebase DB are {

问题 I have a firebase real-time database that looks like this: I want to create a button in this format: How do I do this? Each Button should also do this: Intent intent = new Intent(getBaseContext(), FishInfo.class); intent.putExtra("typeName", "Barbs"); intent.putExtra("typeInfo", "Sample Description..."); startActivity(intent); But use the correct typeName and typeInfo Thank you in advance 回答1: To iterate in the above database, try this:- DatabaseReference ref=FirebaseDatabase.getInstance()

问题 I'm currently trying to code a function who pass the user Data when user exists. When the username is in the database, the code is okay, but if there is no username recorded in the database I don't know how to have a return function. I'm beginner, this is what I did: func observeUserByUsername(username: String, completion: @escaping (Userm?) -> Void) { REF_USERS.queryOrdered(byChild: "username_lowercase").queryEqual(toValue: username).observeSingleEvent(of: .childAdded) { (snapshot) in if let

问题 firebaseAuth = FirebaseAuth.getInstance(); mDatabase = FirebaseDatabase.getInstance(); mDb = mDatabase.getReference(); FirebaseUser user = firebaseAuth.getCurrentUser(); userKey = user.getUid(); mDb.child(userKey).addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { Log.d(TAG, "Name: " + dataSnapshot.child("user_id").getValue()); userID = String.valueOf(dataSnapshot.child("user_id").getValue()); } @Override public void onCancelled

问题 I've always used the structure below to identify whether a user has an account in my app. All of this code is placed in MainActivity , but Google Architecture Components suggests to separate UI from the back-end logic. I've followed the example below for integrating the contact list with MVVM structure. https://github.com/NaarGes/Android-Contact-List But I don't know how to insert the Firebase Realtime Database validation. private void getContactList(){ Cursor phones = getContext()

问题 Hi so I have one Firebase FirebaseRecyclerAdapter and in my Firebase project in my database I have over 30 values and in my app I want to display only the first x items. I searched on internet but I didn't find how I could load only x items. This is my code: mAdapter = new FirebaseRecyclerAdapter<Post, Holder>( Post.class, R.layout.item_layout, Holder.class, mRef ){ @Override public void onBindViewHolder(Holder viewHolder, int position) { Post post = (Post) this.getItem(position); ((Holder)

问题 I'm trying to pull a list of my friends and my friend's friends using Firebase. Right now, I'm pulling my list of friends and then looping through their friends to pull their user ID. I would like to append it to a single array with the output ["friendID1","friendID2", "friendID3", "friendID4","friendID5"]. My code so far: Database.database().reference().child("friends").child(myID).observeSingleEvent(of: .value, with: { (snapshot : DataSnapshot) in for child in snapshot.children.allObjects

问题 My app uses a firebase RecyclerAdapter to display "plant" entities in an activity. I made it so that if I longclick on an entity displayed in Cardview format using a ViewHolder and the RecyclerAdapter it will prompt to perform a delete and delete the plant entity + image on the firebase database and storage. Deleting and adding plants work without a hitch on the backend as I can confirm this on my firebase database. However, when I delete a "plant" entity and add a new one, the CardView shows