Splitting APK into Multiple abi Using Tauri and Gradle Kotlin DSL to Optimize File Size

readme.md

On Main Path

src-tauri/gen/android/keystore.properties

Create the file with these content

keyAlias=upload
password=yourpass
storeFile=/TAURI/upload-keystore.jks

build.gradle.kt

// src-tauri/gen/android/build.gradle.kts

import java.util.Properties
import java.io.FileInputStream

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("rust")
}

val tauriProperties = Properties().apply {
    val propFile = file("tauri.properties")
    if (propFile.exists()) {
        propFile.inputStream().use { load(it) }
    }
}

android {
    compileSdk = 34
    namespace = "com.firstapp.app"
    defaultConfig {
        manifestPlaceholders["usesCleartextTraffic"] = "true"
        applicationId = "com.firstapp.app"
        minSdk = 24
        targetSdk = 34
        versionCode = tauriProperties.getProperty("tauri.android.versionCode", "1").toInt()
        versionName = tauriProperties.getProperty("tauri.android.versionName", "1.0")
        ndk{
            abiFilters.clear() // Clears all ABI filters
        }
    }

    signingConfigs {
        create("release") {
            val keystorePropertiesFile = rootProject.file("keystore.properties")
            val keystoreProperties = Properties()
            if (keystorePropertiesFile.exists()) {
                keystoreProperties.load(FileInputStream(keystorePropertiesFile))
            }
            keyAlias = keystoreProperties["keyAlias"] as String
            keyPassword = keystoreProperties["password"] as String 
            storeFile = file(keystoreProperties["storeFile"])
            storePassword = keystoreProperties["password"] as String
        }
    }

    buildTypes {
        getByName("debug") {
            manifestPlaceholders["usesCleartextTraffic"] = "true"
            isDebuggable = true
            isJniDebuggable = true
            isMinifyEnabled = false
            packaging {                jniLibs.keepDebugSymbols.add("*/arm64-v8a/*.so")
                jniLibs.keepDebugSymbols.add("*/armeabi-v7a/*.so")
                jniLibs.keepDebugSymbols.add("*/x86/*.so")
                jniLibs.keepDebugSymbols.add("*/x86_64/*.so")
            }
        }
        getByName("release") {
            isMinifyEnabled = true
            isShrinkResources = true
            isDebuggable = false
            signingConfig = signingConfigs.getByName("release")
            
            proguardFiles(
                *fileTree(".") { include("**/*.pro") }
                    .plus(getDefaultProguardFile("proguard-android-optimize.txt"))
                    .toList().toTypedArray()
            )
        }
    }


    splits {
        abi {
            isEnable = true // Enables ABI splits
            reset() // Clears previous configuration
            include("armeabi-v7a", "arm64-v8a", "x86", "x86_64") // Specifies ABIs that Gradle should create APKs for
            isUniversalApk = false // Prevents generation of a universal APK
        }
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }
    buildFeatures {
        buildConfig = true
    }
}

rust {
    rootDirRel = "../../../"
}

dependencies {
    implementation("androidx.webkit:webkit:1.6.1")
    implementation("androidx.appcompat:appcompat:1.6.1")
    implementation("com.google.android.material:material:1.8.0")
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.4")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.0")
}

apply(from = "tauri.build.gradle.kts")

RustPlugin.kt

// src-tauri/gen/android/buildSrc/src/main/java/com/firstapp/app/kotlin/RustPlugin.kt
// We need to Comment Out the Default ndk in this file

import com.android.build.api.dsl.ApplicationExtension
import org.gradle.api.DefaultTask
import org.gradle.api.Plugin
import org.gradle.api.Project
import org.gradle.kotlin.dsl.configure
import org.gradle.kotlin.dsl.get

const val TASK_GROUP = "rust"

open class Config {
    lateinit var rootDirRel: String
}

open class RustPlugin : Plugin<Project> {
    private lateinit var config: Config

    override fun apply(project: Project) = with(project) {
        config = extensions.create("rust", Config::class.java)

        val defaultAbiList = listOf("arm64-v8a", "armeabi-v7a", "x86", "x86_64");
        val abiList = (findProperty("abiList") as? String)?.split(',') ?: defaultAbiList

        val defaultArchList = listOf("arm64", "arm", "x86", "x86_64");
        val archList = (findProperty("archList") as? String)?.split(',') ?: defaultArchList

        val targetsList = (findProperty("targetList") as? String)?.split(',') ?: listOf("aarch64", "armv7", "i686", "x86_64")

        extensions.configure<ApplicationExtension> {
            @Suppress("UnstableApiUsage")
            flavorDimensions.add("abi")
            productFlavors {
                create("universal") {
                    dimension = "abi"
                    ndk {
                     
                        // abiFilters += abiList
                    }
                }
                defaultArchList.forEachIndexed { index, arch ->
                    create(arch) {
                        dimension = "abi"
                        ndk {
                            // abiFilters.add(defaultAbiList[index])
                        }
                    }
                }
            }
        }

        afterEvaluate {
            for (profile in listOf("debug", "release")) {
                val profileCapitalized = profile.replaceFirstChar { it.uppercase() }
                val buildTask = tasks.maybeCreate(
                    "rustBuildUniversal$profileCapitalized",
                    DefaultTask::class.java
                ).apply {
                    group = TASK_GROUP
                    description = "Build dynamic library in $profile mode for all targets"
                }

                tasks["mergeUniversal${profileCapitalized}JniLibFolders"].dependsOn(buildTask)

                for (targetPair in targetsList.withIndex()) {
                    val targetName = targetPair.value
                    val targetArch = archList[targetPair.index]
                    val targetArchCapitalized = targetArch.replaceFirstChar { it.uppercase() }
                    val targetBuildTask = project.tasks.maybeCreate(
                        "rustBuild$targetArchCapitalized$profileCapitalized",
                        BuildTask::class.java
                    ).apply {
                        group = TASK_GROUP
                        description = "Build dynamic library in $profile mode for $targetArch"
                        rootDirRel = config.rootDirRel
                        target = targetName
                        release = profile == "release"
                    }

                    buildTask.dependsOn(targetBuildTask)
                    tasks["merge$targetArchCapitalized${profileCapitalized}JniLibFolders"].dependsOn(
                        targetBuildTask
                    )
                }
            }
        }
    }
}

These is Used To Fix ndk File Conflic

when setting the split file on the build.gradle.kts

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Failed to notify project evaluation listener.
   > Conflicting configuration : 'armeabi-v7a,x86_64,arm64-v8a,x86' in ndk abiFilters cannot be present when splits abi filters are set : armeabi-v7a,x86_64,x86,arm64-v8a
   > Task with name 'mergeUniversalDebugJniLibFolders' not found in project ':app'.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.