Can't downgrade Android Gradle plugin version

Question

What could be the reason I can't downgrade Android Gradle plugin version?

I have updated to Gradle plugin 2.0 and now I want to use 1.5 but my installed Android Studio says :

> Error:The project is using an incompatible version of the Android
> Gradle plugin. Please update your project to use version 2.1.0

 classpath 'com.google.gms:google-services:2.0.0-alpha6'

ad requested in Google Analytics latest version , but the Gradle not working as i want so i want to return to 1.5 .

this is my Gradle file :

buildscript {
    repositories {
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0'
        classpath 'com.google.gms:google-services:2.0.0-alpha6'
    }
}

repositories {
    mavenCentral()
}

allprojects {
    repositories {
        jcenter()
    }
}

Answer 1

Changing to

classpath 'com.google.gms:google-services:1.5.0'

instead

classpath 'com.google.gms:google-services:2.0.0-alpha6'

and in the inner Gradle file :

compile 'com.google.android.gms:play-services:8.4.0'

instead

compile 'com.google.android.gms:play-services:8.3.0'

Solved the problem .

all i need to check now is the affect on the Google Analyticts but the code compiled and run so at least we know for sure what is the incompatible part .