error: duplicate value for resource 'attr/layout_anchorGravity' with config ''.

[GusWard]

Incompatibility with CoordinatorLayout which already defines layout_anchorGravity in newer versions.

[yonghun7478]

do you add implementation 'com.android.support:design:XX.X.X', implementation 'com.android.support:support-v4:XX.X.X' ?
when I saw "duplicate value for resource" message I just had implementation 'com.android.support:appcompat-v7:28.0.0'

and I added implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-v4:28.0.0' and worked it !

[AizenSousek]

THX,worked after add dependencies

[nagdeo]

Thanks! It worked after adding design dependency

[VictorKabata]

Thanks it solved my problem

[niktram]

Thank you... worked for me too...

[tayab-sheikh]

thanks

[gezihua]

PS_ANDROIDBUILDTOOLSVERSION=29.0.1
android.aapt2FromMavenOverride=${Android_home}/build-tools/29.0.1/aapt2

disable aapt2 from maven

[atwiineharman]

hi there i already have the dependencies and am still getting the same error

[titosobabas]

do you add implementation 'com.android.support:design:XX.X.X', implementation 'com.android.support:support-v4:XX.X.X' ?
when I saw "duplicate value for resource" message I just had implementation 'com.android.support:appcompat-v7:28.0.0'

and I added implementation 'com.android.support:design:28.0.0'
implementation 'com.android.support:support-v4:28.0.0' and worked it !

works perfect but in my case using material search view library

[colombiaje]

Thanks to you.
Where is the implementation created?

[xSynergyx]

Thanks! This worked well.