APK file size increased after using kotlin in Android Project

Question

I've created an Android application in android studio and for programming language I used Kotlin.
Now my application finished and I want to build my app, but after building the app, my APK file size becomes 35mb !!!
My drawable folders size is 2mb and I dont have any large size files, but why my application size is 35mb ?!

For generating test apk version, I used Build -> Generate Signed Build/APK from android studio menu.

But when I use java for language this size is 7mb!!!

I used these dependencies :

    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation "androidx.appcompat:appcompat:$androidx_version"
    implementation "androidx.core:core-ktx:$androidx_version"
    implementation "androidx.constraintlayout:constraintlayout:$constrant_layout_version"
    implementation "androidx.recyclerview:recyclerview:$material_version"
    implementation "com.google.android.material:material:$material_version"
    implementation "androidx.legacy:legacy-support-v4:$material_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    testImplementation "junit:junit:$junit_version"
    androidTestImplementation "androidx.test.ext:junit:$androidx_junit_version"
    androidTestImplementation "androidx.test.espresso:espresso-core:$espresso_version"
    //Anko lib
    implementation "org.jetbrains.anko:anko-commons:$anko_version"
    //Rx
    implementation "io.reactivex.rxjava2:rxandroid:$rxandroid_version"
    implementation "io.reactivex.rxjava2:rxjava:$rxjava_version"
    //OkHttp
    implementation "com.squareup.okhttp3:okhttp:$okhttp_version"
    implementation "com.squareup.okhttp3:logging-interceptor:$okhttp_version"
    //Retrofit
    implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
    implementation "com.squareup.retrofit2:adapter-rxjava2:$retrofit_version"
    implementation "com.squareup.retrofit2:converter-gson:$retrofit_version"
    implementation 'com.squareup.retrofit2:converter-scalars:2.5.0'
    //Gson
    implementation "com.google.code.gson:gson:$gson_version"
    //Image
    implementation "com.github.bumptech.glide:glide:$glide_version"
    annotationProcessor "com.github.bumptech.glide:compiler:$glide_version"
    //Calligraphy
    implementation "io.github.inflationx:calligraphy3:$calligraphy_version"
    implementation "io.github.inflationx:viewpump:$viewpump_version"
    //Preferences lib
    implementation "com.github.MrNouri:GoodPrefs:$nourilib_versions"
    //Dynamic ui sizes
    implementation "com.github.MrNouri:DynamicSizes:$nourilib_versions"
    //Support MultiDex
    implementation "androidx.multidex:multidex:$multidex_version"
    //Animations
    implementation "com.daimajia.easing:library:$yoyoanimation_version"
    implementation "com.daimajia.androidanimations:library:$nineoldandroid_version"
    //Map
    implementation "ir.map.sdk:sdk_map:$mapir"
    implementation "com.mapbox.mapboxsdk:mapbox-sdk-services:$mapbox_service"
    implementation "com.mapbox.mapboxsdk:mapbox-sdk-geojson:$mapbox_service"
    implementation "com.mapbox.mapboxsdk:mapbox-android-telemetry:$mapbox_telemetry"
    implementation "com.mapbox.mapboxsdk:mapbox-android-gestures:$mapbox_gestures"
    //Permission
    implementation "ru.superjob:kotlin-permissions:$permission_version"
    //Expandable recyclerview
    implementation "com.thoughtbot:expandablerecyclerview:$expandable_recycler_version"
    //Firebase messaging
    implementation "com.google.firebase:firebase-messaging:$firebase_messaging_version"
    //Firebase crashlytics
    implementation "com.google.firebase:firebase-analytics:$firebase_analytics_version"
    implementation "com.crashlytics.sdk.android:crashlytics:$firebase_crashlytics_version"
}

How can I fix it?

Answer 1

First thing you are using lots of library might be this is reason for big app size. Few thing you can to reduce app size

1. Use your own component other then external library for example you are using Expendable recyclerview library implementation"com.thoughtbot:expandablerecyclerview:$expandable_recycler_version"

2. Use Svg drawable other then png etc .Because you can use same svg file all screen size .

3. Remove unused resources

4. And last if you tried all of this then Use ABI . Though this you can create multi build for different device. Paste this in android block in build.gradle file

   splits {
    abi {
       enable true
       reset()
       include 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a', 'armeabi', 'mips',
      'mips64'
       universalApk true
      }
     }
     project.ext.versionCodes = ['armeabi': 1, 'armeabi-v7a': 2, 'arm64-v8a': 
     3, 'mips': 5, 'mips64': 6, 'x86': 8, 'x86_64': 9]
   
     android.applicationVariants.all { variant ->
   
     variant.outputs.each { output -> output.versionCodeOverride =
     project.ext.versionCodes.get(
       output.getFilter(com.android.build.OutputFile.ABI), 0
       ) * 1000000 + android.defaultConfig.versionCode
     }
    }