Rocket.Chat.ReactNative/android/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext {
        buildToolsVersion = "28.0.3"
        minSdkVersion = 21
        compileSdkVersion = 28
        targetSdkVersion = 28
        supportLibVersion = "28.0.0"
    }
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven {
            url 'https://maven.fabric.io/public'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.1'
        classpath 'com.google.gms:google-services:4.2.0'
        classpath 'io.fabric.tools:gradle:1.25.4'
        classpath 'com.google.firebase:firebase-plugins:1.1.5'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven { url "https://jitpack.io" }
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
    }
}

subprojects { subproject ->	
    afterEvaluate {	
        if ((subproject.plugins.hasPlugin('android') || subproject.plugins.hasPlugin('android-library'))) {	
            android {	
                compileSdkVersion 28	
                buildToolsVersion "28.0.3"	
                defaultConfig {	
                    targetSdkVersion 28	
                }	
            }	
        }	
    }	
}