android support v7 gradle zone - XoilacTV

Make sure you have downloaded the Android Support Repository using the SDK Manager. **Open the build.gradle file for your application.** Add the support library feature project identifier to the dependencies section.

I tried to import this support library into my project but can't get it to work. First of all I can't find it. When I hit the + button on the Dependencies tab and search for it. I have found android.support.v4 but I need v7 as well. I read somewhere that the library might be deprecated.

I'm trying to import this : import android.support.v7.widget.RecyclerView; But I got that : "Cannot resolve symbole v7". Indeed, when I'm typing android.support. I can choose v4 but not v7. This is my build.gradle :

implementation 'com.android.support:appcompat-v7:28..0' : All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 26.1.0. Examples include. com.android.support:animated-vector-drawable:28... and . com.android.support:support-v4:26.1.