Kotlin Firebase Realtime Database - Read/Write Data example | Android » grokonez

Kotlin Firebase Realtime Database - Read/Write Data example | Android » grokonez

Way to read/write data in an Android App - Kotlin Firebase read write data Android - Kotlin Firebase retrieve data Android - Kotlin database example

https://grokonez.com/android/kotlin-firebase-realtime-database-readwrite-data-example-android

Kotlin Firebase Realtime Database – Read/Write Data example | Android

Firebase Realtime Database is a cloud-hosted database that helps us to store and sync data with NoSQL cloud database in realtime to every connected client. In this tutorial, we're gonna look at way to read/write data in an Android App with Kotlin.

More Practice:

I. Firebase Realtime Database Overview

1. How data is structured

All Firebase Realtime Database data is stored as JSON objects without tables or records. When adding data, it becomes a node in JSON structure. For each node, we can: - provide our own key (IDs/semantic names), or - let it do automatically using push() method.

{
  "users": {
    "EAuSKQmToJgs8g28Hdlor4MT3HM2": {
      "name": "JavaSampleApproach",
      "email": "[email protected]",
    },
    "CgumIKCBG6eUKFEG1DTlrgxajR52": {
      "name": "Kotlination",
      "email": "[email protected]",
    }
  }

"message": { "author": "JavaSampleApproach", "body": "WOW! Java Technology, Spring Framework!" }

"chats": { "one": { "author": "JavaSampleApproach", "body": "Hello, Java please!", }, "two": { "author": "Kotlination", "body": "Kotlin is good!", } } }

2. Offline Capabilities on Android

Firebase work even if our app temporarily loses internet connection. It provides tools for persisting data locally, managing presence, and handling latency.

2.1 Disk Persistence

When enabling disk persistence that automatically stores the data offline in case of no internet connection. When internet is on, offline data will be pushed to realtime database, even if the user or operating system restarts the app.

We can enable disk persistence with just one line of code:


FirebaseDatabase.getInstance().setPersistenceEnabled(true)

2.2 Managing Presence

- Firebase provides simple primitives that we can use to write to the database at the time client disconnects from the Firebase Database servers. All write operations, including setting, updating, and removing, can be performed upon a disconnection.

// Write a string to node "disconnectmessage" when this client loses connection
FirebaseDatabase.getInstance().getReference("disconnectmessage").onDisconnect().setValue("I disconnected!")
- With Firebase, we also can detect Connection State. It is useful to know when our app is online or offline. Firebase Realtime Database provides a special location at /.info/connected which is updated every time the client's connection state changes.

2.3 Handling Latency

The Firebase Realtime Database servers provide a mechanism to insert timestamps generated on the server as data with firebase.database.ServerValue.TIMESTAMP.

3. CRUD Operations

We can insert, read, update, delete data from Firebase Realtime Database. By default, these operations access to database is restricted so only authenticated users can read or write data.

II. Way to read/write data

0. Add Firebase to Android App

0.1 Add Firebase Realtime Database

Steps to import and enable Firebase Realtime Database is just like steps for Firebase Auth. Just follow: Add_Firebase_to_Android_Project kotlin-firebase-db-set-up-0

0.2 Add Firebase Auth

By default, only authenticated users can read or write data, so we need Firebase Authentication. Go to Your Firebase Project Console -> Authentication -> SIGN-IN METHOD -> Enable Email/Password.

More at:

https://grokonez.com/android/kotlin-firebase-realtime-database-readwrite-data-example-android

Kotlin Firebase Realtime Database – Read/Write Data example | Android

kotlin android firebase database

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