Cannot fit requested classes in a single dex file . UnityでAndroidビルド時のエラー

Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF-8
注意:/Users/{PATH}/Temp/gradleOut/unityLibrary/src/main/java/com/unity3d/player/UnityPlayerActivity.javaは非推奨のAPIを使用またはオーバーライドしています。
注意:詳細は、-Xlint:deprecationオプションを指定して再コンパイルしてください。
D8: Cannot fit requested classes in a single dex file (# methods: 109840 > 65536)
com.android.builder.dexing.DexArchiveMergerException: Error while merging dex archives: 
The number of method references in a .dex file cannot exceed 64K.

ここに解決策が書いてあった． forum.unity.com

64k問題と言われるAndoroidでは有名な問題らしい・

Project Setting->Player->Publishing SettingsにでCustom Launcher Gradleを有効にする．

Assets/Plugin/LauncherTemplete.gradleを

// GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAIN

apply plugin: 'com.android.application'

dependencies {
    implementation project(':unityLibrary')
    }

android {
    compileSdkVersion **APIVERSION**
    buildToolsVersion '**BUILDTOOLS**'

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        minSdkVersion **MINSDKVERSION**
        targetSdkVersion **TARGETSDKVERSION**
        multiDexEnabled true
        applicationId '**APPLICATIONID**'
        ndk {
            abiFilters **ABIFILTERS**
        }
        versionCode **VERSIONCODE**
        versionName '**VERSIONNAME**'
    }

    aaptOptions {
        noCompress = ['.ress', '.resource', '.obb'] + unityStreamingAssets.tokenize(', ')
        ignoreAssetsPattern = "!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~"
    }**SIGN**

    lintOptions {
        abortOnError false
    }

    buildTypes {
        debug {
            minifyEnabled **MINIFY_DEBUG**
            proguardFiles getDefaultProguardFile('proguard-android.txt')**SIGNCONFIG**
            jniDebuggable true
        }
        release {
            minifyEnabled **MINIFY_RELEASE**
            proguardFiles getDefaultProguardFile('proguard-android.txt')**SIGNCONFIG**
        }
    }**PACKAGING_OPTIONS****PLAY_ASSET_PACKS****SPLITS**
**BUILT_APK_LOCATION**
    bundle {
        language {
            enableSplit = false
        }
        density {
            enableSplit = false
        }
        abi {
            enableSplit = true
        }
    }
}**SPLITS_VERSION_CODE****LAUNCHER_SOURCE_BUILD_SETUP**

のように変更したところ動くようになった．