I would like use a FloatingActionButton on my application, I read this : https://guides.codepath.com/android/Floating-Action-Buttons#google-s-official-support-library but wh
Add these dependencies into your gradle file. This may solve the problem in some cases.
dependencies { compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.android.support:design:23.1.1' ... }