Unable to merge DEX in Android Studio 3.0.1 even after enabling multidex

Question

I have a problem in my android project. I recently upgraded from lower version and then rebooted my OS with Linux. My project was working fine. But, now as I have compiled,

Answer 1

This isn't a multidex problem...it's a dependency merge conflict issue.

By the looks of it one of your dependencies has a sub-dependency on CoordinatorLayout but has specified a different version from the one which you are using. You can fix this by using a resolutionStrategy in your build.gradle to define the version of the support library to use.

First make a variable to define your support library version:

ext {
    supportLibVersion = "26.1.0"
}

Then update your dependences to use this variable rather than the hard coded value (note the double quotes):

implementation "com.android.support:appcompat-v7:${supportLibVersion}"
implementation "com.android.support:design:${supportLibVersion}"

Then you can add a resolutionStrategy to your build.gradle:

configurations.all {
    resolutionStrategy.eachDependency { details ->
        def requested = details.requested
        if (requested.group == 'com.android.support') {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion "${supportLibVersion}"
            }
        }
    }
}

What this does is ask Gradle to ignore the version number specified in with the dependency and use your version.