How configure firestore with your flutter application ?

Step 1 -  Go to https://console.firebase.google.com/ 

Step 2 - Click on add project

Step 3 - Click add Firebase to your Android app

Step 4 - fill the android package name and click register

Step 5 - Download config file & put it inside '\android\app'

Step 6 - Go to '\android' location and open 'build.gradle' add this line inside the dependencies

classpath 'com.google.gms:google-services:4.3.3'

 

Step 7 - Get into app 'build.gradle' and go to end 

If this line is already there do not add again.

add this line apply plugin: 'com.android.application'

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

 

Inside the dependencies

dependencies {

  implementation 'com.google.firebase:firebase-analytics:17.2.2'

}

Step 8 - go to pubspec.yaml

add this below dependency

 cloud_firestore: ^0.13.5 

Note - If you face any problem, Try this Open project/app/build.gradle and add the following lines.

defaultConfig {
    ...

    multiDexEnabled true
}

and

dependencies {
    ...

    implementation 'com.android.support:multidex:1.0.3' 

}