RetroMusicPlayer/appthemehelper/build.gradle

apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
android {
    compileSdkVersion 31
    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 29

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'com.google.android.material:material:1.5.0-alpha05'
    implementation 'androidx.preference:preference-ktx:1.1.1'
    implementation 'androidx.cardview:cardview:1.0.0'

    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
}