Retrofit Library is Not importing After Create new project in Android

Question

I create new project and Wants to Use Retrofit library in my Project.

I implemented this library for Gson and Retrofit but still I can't import it to my Project.

implementation 'com.google.code.gson:gson:2.9.0'
implementation 'com.squareup.picasso:picasso:2.8'

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.7.2'

Error to add Retrofit Library

Answer 1

Here there is something to check weather it's all set or not.

1 - First implement the library in builde.gradle like below.

implementation 'com.google.code.gson:gson:2.9.0'
implementation 'com.squareup.picasso:picasso:2.8'

implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.7.2'

2 - Add this properties to your gradle.properties

android.useAndroidX=true
android.nonTransitiveRClass=true

3 - Then Add Google() and mavenCentral in your settings.gradle like Below

pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}
dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
    }
}

4 - check compileOptions in your build-gradle file

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

After all this steps you can import your retrofit and gson library.