Instead of having gradle fetch MpAndroidChart's code from Maven, I am downloading the library's code locally (because I need to do some modifications on the library to improve performance) and then manually add it to my project.

I executed the below steps:

1. Moved the code into RootOfProjectFolder/libs/MpAndroidChart.

2. Made the following changes to my project:

   a. Added the library to settings.gradle:

   include ':MpAndroidChart'
   project(':MpAndroidChart').projectDir = new File('libs/MpAndroidChart')
   

   b. Including the library as a dependency in app-level build.gradle:

   implementation project(":MpAndroidChart")

But I still get this error:

No matching variant of project :MpAndroidChart was found. The consumer was configured to find a library for use during compile-time, preferably optimized for Android, as well as attribute 'com.android.build.api.attributes.AgpVersionAttr' with value '8.5.0', attribute 'com.android.build.api.attributes.BuildTypeAttr' with value 'debug', attribute 'org.jetbrains.kotlin.platform.type' with value 'androidJvm' but:

• No variants exist.

I have no idea what that means.

Below is all the code of my project's build.gradle files:

App-level:

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-parcelize'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics'
apply plugin: 'androidx.navigation.safeargs.kotlin'
apply plugin: 'kotlin-kapt'
apply plugin: 'com.chaquo.python'

apply from: 'artifacts.gradle'

def keystorePropertiesFile = rootProject.file("keystore.properties")
def keystoreProperties = new Properties()
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))

android {
    namespace rootProject.ext.applicationId
    compileSdk rootProject.extpileSdkVersion
    ndkVersion '24.0.8079956'
    defaultConfig {
        applicationId rootProject.ext.applicationId
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode project.version_code
        versionName project.version_name
        //testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        kapt {
            arguments {
                arg("room.schemaLocation", "$projectDir/schemas".toString())
                arg("room.incremental", "true")
                arg("room.expandProjection", "true")
            }
        }
        resourceConfigurations += ['en']
        resValue "string", "app_name", "${rootProject.name}"
        ndk {
            //abiFilters "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
            //noinspection ChromeOsAbiSupport
            abiFilters "arm64-v8a"
        }
        python {
            version "3.8"
            pip {
                install "numpy"
                install "heartpy"
                install "matplotlib"
                install "pandas"
                install "scipy"
                install "openpyxl"
                install "torch"
                install "cvxopt"
                install "scikit-learn"
            }
        }
    }
    sourceSets {
        main {
            java.srcDirs += 'src/main/kotlin'
            res.srcDirs = [
                    'src/main/res',
                    file('src/main/res/features/').listFiles()
            ]
        }
    }
    /*bundle {
        storeArchive {
            enable = false
        }
    }*/
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_21
        targetCompatibility JavaVersion.VERSION_21
    }
    kotlin {
        jvmToolchain(21)
    }
    packagingOptions {
        jniLibs {
            excludes += ['META-INF/**']
        }
        resources {
            excludes += ['META-INF/**']
        }
    }
    buildFeatures {
        dataBinding true
        viewBinding true
        buildConfig true
    }
    signingConfigs {
        debug {
            storeFile file(keystoreProperties['storeFileDebug'])
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storePassword keystoreProperties['storePassword']
        }
        emulator {
            storeFile file(keystoreProperties['storeFileDebug'])
        }
        release {
            storeFile file(keystoreProperties['storeFile'])
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storePassword keystoreProperties['storePassword']
        }
    }
    buildTypes {
        debug {
            resValue "string", "app_name", "dev ${rootProject.name}"
            applicationIdSuffix = ".dev"
            versionNameSuffix "-dev"
            resValue "string", "app_version", "${defaultConfig.versionName}${versionNameSuffix}"
            debuggable true
            minifyEnabled false
            shrinkResources false
            signingConfig signingConfigs.debug
            manifestPlaceholders.crashlyticsCollectionEnabled = true
            buildConfigField "String", "SERVER_IP_ADDRESS", "\"192.168.0.100\""
        }
        emulator {
            resValue "string", "app_name", "dev ${rootProject.name}"
            applicationIdSuffix = ".dev"
            versionNameSuffix "-dev"
            resValue "string", "app_version", "${defaultConfig.versionName}${versionNameSuffix}"
            debuggable true
            minifyEnabled false
            shrinkResources false
            signingConfig signingConfigs.debug
            manifestPlaceholders.crashlyticsCollectionEnabled = false
            buildConfigField "String", "SERVER_IP_ADDRESS", "\"192.168.0.100\""
        }
        /*qa {
            resValue "string", "app_name", "${rootProject.name}"
            resValue "string", "app_version", "${defaultConfig.versionName}${versionNameSuffix}"
            debuggable true
            minifyEnabled false
            shrinkResources false
            firebaseCrashlytics {
                mappingFileUploadEnabled false
            }
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
            manifestPlaceholders.crashlyticsCollectionEnabled = true
            buildConfigField "String", "SERVER_IP_ADDRESS", "\"192.168.0.100\""
        }*/
        release {
            resValue "string", "app_name", "${rootProject.name}"
            resValue "string", "app_version", "${defaultConfig.versionName}${versionNameSuffix}"
            debuggable true
            minifyEnabled false
            shrinkResources false
            firebaseCrashlytics {
                mappingFileUploadEnabled false
            }
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
            manifestPlaceholders.crashlyticsCollectionEnabled = true
            buildConfigField "String", "SERVER_IP_ADDRESS", "\"192.168.0.100\""
        }
    }
    lint {
        checkReleaseBuilds true
    }
}

dependencies {
    // Shimmer
    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
    implementation 'org.apachemons:commons-math:2.2'
    implementation 'javax.vecmath:vecmath:1.5.2'
    implementation 'org.apachemons:commons-lang3:3.13.0'

    // Support
    implementation 'androidx.core:core-ktx:1.15.0'
    implementation 'androidx.appcompat:appcompat:1.7.0'

    // AndroidX UI
    implementation "androidx.constraintlayout:constraintlayout:2.2.0"
    implementation "androidx.fragment:fragment-ktx:1.8.5"

    // RecyclerView
    implementation "androidx.recyclerview:recyclerview:1.3.2"
    implementation "androidx.recyclerview:recyclerview-selection:1.1.0"

    // AndroidX Navigation
    implementation "androidx.navigation:navigation-fragment-ktx:2.8.5"
    implementation "androidx.navigation:navigation-ui-ktx:2.8.5"
    //implementation "androidx.navigation:navigation-dynamic-features-fragment:2.5.2"

    // AndroidX lifecycle ViewModel and LiveData
    def lifecycleVersion = '2.6.1'
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycleVersion"
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycleVersion"
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycleVersion"
    implementation "androidx.lifecycle:lifecycle-common-java8:$lifecycleVersion"

    // Room
    def roomVersion = '2.6.1'
    implementation "androidx.room:room-runtime:$roomVersion"
    kapt "androidx.room:room-compiler:$roomVersion"
    implementation "androidx.room:room-ktx:$roomVersion"

    // Material
    implementation "com.google.android.material:material:1.9.0"

    // Kotlin
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.9.0'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0'
    //implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.21'
    //implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4"
    //implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4"

    // Koin
    implementation 'io.insert-koin:koin-core:3.3.3'
    implementation 'io.insert-koin:koin-android:3.3.3'
    implementation 'io.insert-koin:koin-androidx-navigation:3.3.3'

    // Glide
    def glideVersion = '4.15.1'
    implementation "com.github.bumptech.glide:glide:$glideVersion"
    implementation "com.github.bumptech.glide:okhttp3-integration:$glideVersion"
    kapt "com.github.bumptech.glide:compiler:$glideVersion"

    // Retrofit
    implementation "com.squareup.retrofit2:retrofit:2.9.0"
    implementation "com.squareup.retrofit2:converter-gson:2.9.0"

    // OkHttp
    implementation "com.squareup.okhttp3:okhttp:5.0.0-alpha.3"
    implementation "com.squareup.okhttp3:logging-interceptor:5.0.0-alpha.3"

    // Gson
    implementation 'com.google.code.gson:gson:2.10.1'

    // Encapsulates server response with sealed class NetworkResponse
    implementation 'com.github.haroldadmin:NetworkResponseAdapter:5.0.0'

    // Firebase
    implementation 'com.google.firebase:firebase-crashlytics-ktx:18.3.7'
    //implementation 'com.google.firebase:firebase-analytics-ktx:21.1.1'

    // Tools
    implementation 'org.ocpsoft.prettytime:prettytime:5.0.6.Final'
    implementation 'pub.devrel:easypermissions:3.0.0'
    implementation 'com.github.AbedElazizShe:LightCompressor:1.2.0'
    //implementation 'com.github.stfalcon-studio:StfalconImageViewer:v1.0.1'

    // ExoPlayer
    implementation "com.google.android.exoplayer:exoplayer-core:2.18.6"
    implementation "com.google.android.exoplayer:exoplayer-ui:2.18.6"

    // Ktor Server
    def ktorVersion = '2.3.13'
    implementation "io.ktor:ktor-server-core:$ktorVersion"
    implementation "io.ktor:ktor-server-netty:$ktorVersion"
    implementation "io.ktor:ktor-server-compression:$ktorVersion"
    implementation "io.ktor:ktor-server-call-logging:$ktorVersion"
    implementation "io.ktor:ktor-server-default-headers:$ktorVersion"
    implementation "io.ktor:ktor-server-content-negotiation:$ktorVersion"

    // Ktor Client
    implementation("io.ktor:ktor-client-core:$ktorVersion")
    implementation "io.ktor:ktor-client-cio:$ktorVersion"
    implementation "io.ktor:ktor-client-content-negotiation:$ktorVersion"

    // Ktor Serialization
    implementation "io.ktor:ktor-serialization-gson:$ktorVersion"

    // noinspection GradleDependency upgrading this will not work. comenting this since will not work with moquette.
    //implementation 'ch.qos.logback:logback-classic:1.2.3'

    // jUnit
    //testImplementation 'junit:junit:4.13.2'

    // Tests Koin
    // Koin Test features
    // testImplementation "io.insert-koin:koin-test:$koin_version"
    // Koin for JUnit 4
    // testImplementation "io.insert-koin:koin-test-junit4:$koin_version"
    // Koin for JUnit 5
    // testImplementation "io.insert-koin:koin-test-junit5:$koin_version"

    // Tests Ktor
    //testImplementation("io.ktor:ktor-server-test-host:$ktorVersion")
    //testImplementation("org.jetbrains.kotlin:kotlin-test")
    //testImplementation "io.ktor:ktor-client-cio:$ktorVersion"
    //testImplementation "io.ktor:ktor-client-okhttp:$ktorVersion"

    // Instrumented Tests
    //androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    //androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    // Charts
    implementation project(":MpAndroidChart")
    implementation 'com.github.ggalmazor:lt_downsampling_java8:0.0.6'

    def camerax_version = "1.4.1"
    implementation "androidx.camera:camera-core:${camerax_version}"
    implementation "androidx.camera:camera-camera2:${camerax_version}"
    implementation "androidx.camera:camera-lifecycle:${camerax_version}"
    implementation "androidx.camera:camera-video:${camerax_version}"
    implementation "androidx.camera:camera-view:${camerax_version}"
    implementation "androidx.camera:camera-extensions:${camerax_version}"

    // MQTT Broker
    implementation('io.moquette:moquette-broker:0.16') {
        //exclude group: "org.slf4j"
    }
    //implementation 'org.slf4j:slf4j-simple:1.7.36'
    implementation 'androidx.datastore:datastore-preferences:1.0.0'

    // MQTT Client
    implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'
    // implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
    // implementation project(path: ':mqtt')

    // AWS Services
    implementation 'com.amazonaws:aws-android-sdk-s3:2.7.4'

    // Location
    implementation("com.google.android.gms:play-services-location:21.3.0")
}

Project-level:

apply from: 'version.gradle'

buildscript {
    ext {
        applicationId = 'com.sampleApp.v1'
        targetSdkVersion = 35
        minSdkVersion = 31
        compileSdkVersion = targetSdkVersion
    }
    repositories {
        google()
        mavenCentral()
        maven { url '' }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.5.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.25"
        classpath "com.google.gms:google-services:4.4.2"
        classpath "com.google.firebase:firebase-crashlytics-gradle:3.0.2"
        classpath "androidx.navigation:navigation-safe-args-gradle-plugin:2.8.5"
        classpath "com.chaquo.python:gradle:13.0.0"
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
        maven { url "; }
    }
    gradle.projectsEvaluated {
        tasks.withType(JavaCompile).tap {
            configureEach {
                optionspilerArgs << "-Xlint:deprecation"
            }
        }
    }
}

tasks.register('clean', Delete) {
    delete rootProject.layout.buildDirectory
}