Simple example of using firestore in Android | Kotlin

Here is the simple example of maintaining database using Firebase instead of SQLite in Kotlin Programming Language.

Step 1.

Login into Firebase Console and create your project.

Step 2.

Navigate into Database and follow the steps given there.

Step 3.

Create your Android project and add the following classpath into root of the project's build.gradle.

classpath 'com.google.gms:google-services:3.1.1'

Step 4.

And then add the following plugin into your module's build.gradle.

apply plugin: 'com.google.gms.google-services'

Step 5.

And then add the following dependency into your module's build.gradle.

implementation 'com.firebaseui:firebase-ui-firestore:3.3.1'

That's all you wanted to access the Firebase's Firestore API in your project.
Here is the methods to create document(Like table in SQLite), Add data to document, edit data from document, delete data from document.

Add data to document using Hashmap.

//Create employee using hashmap
val employee = HashMap()
employee.put("name", "Guna")
employee.put("phoneNumber", "1144778855")
employee.put("email", "Guna@gmail.com")

//Add a new document with a generated ID
mFirestore.collection("employees")
          .add(employee)
          .addOnSuccessListener({ documentReference -> Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.id) })
          .addOnFailureListener({ e -> Log.w(TAG, "Error adding document", e) })

Add data to document using entity.

        //Create employee using entity
        val employee = Employee("Guna", "1144778855", "Guna@gmail.com")

        //Add a new document with a generated ID
        mFirestore.collection("employees")
                 .add(employee)
                 .addOnSuccessListener({ documentReference -> Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.id) })
                 .addOnFailureListener({ e -> Log.w(TAG, "Error adding document", e) })

Edit data from document using entity.

        //Create employee using entity
        val employee = Employee("Gunaseelan", "1144778866", "Gunaseelan@gmail.com")

        //Edit document with a generated ID
        mFirestore.collection("employees")
                 .document(documentReference.id)//Generated while adding employee
                 .addOnSuccessListener({ documentReference -> Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.id) })
                 .addOnFailureListener({ e -> Log.w(TAG, "Error adding document", e) })

Delete data from document

        //Add a new document with a generated ID
        mFirestore.collection("employees")
                 .document(documentReference.id)//Generated while adding employee
                 .delete()

Here is the video output of this source code

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Source code on GitHub

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