Gradle Dependencies using Google's Way

This is Google’s recommended way of doing this as seen in the Android documentation. It is also used in lots of Android projects, like ButterKnife and Picasso.

This method is great for upgrading libraries like the support library. Every support library dependency has the same version number, so only having to change this in one place is 💯. The same things goes for Retrofit, and many other libraries.

Root-level build.gradle

ext {
  versions = [
    support_lib: "27.0.2",
    retrofit: "2.3.0",
    rxjava: "2.1.9"
  libs = [
    support_annotations: "${versions.support_lib}",
    support_appcompat_v7: "${versions.support_lib}",
    retrofit :"com.squareup.retrofit2:retrofit:${versions.retrofit}",
    retrofit_rxjava_adapter: "com.squareup.retrofit2:adapter-rxjava2:${versions.retrofit}",
    rxjava: "io.reactivex.rxjava2:rxjava:${versions.rxjava}"

App or Module’s build.gradle

implementation libs.support_annotations
implementation libs.support_appcompat_v7
implementation libs.retrofit
implementation libs.retrofit_rxjava_adapter
implementation libs.rxjava

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Wajahat Karim
🌍 Making the world a better place, one app at a time.
🔥 Google Developer Expert (GDE) in Android . 📱 Professional Android Developer with ~7 years experience. 💻 Creator of various Open Source libraries on Android . 📝 Author of two technical books and 100+ articles on Android. 🎤 A passionate Public Speaker giving talks all over the world.
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Wajahat Karim

🔥 Google Dev Expert (GDE) in Android .
📱 Android Dev. 💻 Open Source Contributor . 📝 Technical Writer . 🎤 Public Speaker

Senior Android Developer

Karachi, Pakistan