Multidex issue with Flutter

Enable multidex

Open [project_folder]/app/build.gradle and add following lines.

defaultConfig {
    ...

    multiDexEnabled true
}

dependencies {
    ...

    implementation 'com.android.support:multidex:1.0.3'
}

Enable Jetifier

Open [project_folder]/android/gradle.properties and add following lines.

android.useAndroidX=true
android.enableJetifier=true