Error : Program type already present: android.support.design.widget.CoordinatorLayout$Behavior

Question

It worked when I downgrade the support appcompat gradle dependency, like follwing :

implementation 'com.android.support:appcompat-v7:27.0.2'

previously it was

implementation 'com.android.support:appcompat-v7:27.1.0'

OR

Also this can be fixed by just adding support design dependency of version 27.1.0 or above to your app level build.gradle as following :

implementation 'com.android.support:design:27.1.0'

I faced the same problem, I added android support design dependencies to the app level build.gradle

Add following:

implementation 'com.android.support:design:27.1.0'

in build.gradle. Now its working for me.

It might be cause of a library, I faced it because of Glide.

It was

implementation 'com.github.bumptech.glide:glide:4.7.1'

So I added exclude group: "com.android.support" And it becomes

implementation ('com.github.bumptech.glide:glide:4.7.1') {
        exclude group: "com.android.support"
    }

Make sure these two are the same version in your app level build.gradle file

    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support:design:27.1.1'

I think that should solve the problem

Use the latest supportLibrary, version 27.1.1 to solve the problem. worked for me. (many bug fixes included - see changelog)

Personally, I add the following line to my app/build.gradle:

implementation "com.android.support:design:${rootProject.ext.supportLibVersion}"

With this syntax, version is dynamical.