build.gradle

buildscript {
    ext{
        kotlin_version='1.5.10'
    }
    repositories {
        google()
        jcenter()
        mavenCentral()//added
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.2.2'   //change this with latest gradle version.
        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.20'
        classpath 'com.google.gms:google-services:4.3.8'
    }
}

allprojects {
    repositories {
        jcenter()
        google()
        mavenCentral()//added
    }
}
apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.draganddrop"
        minSdkVersion 28
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'androidx.recyclerview:recyclerview:1.2.1'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

}